Publications
2021
Jin, Jing; Sun, Hao; Daly, Ian; Li, Shurui; Liu, Chang; Wang, Xingyu; Cichocki, Andrzej
A Novel Classification Framework Using the Graph Representations of Electroencephalogram for Motor Imagery based Brain-Computer Interface Journal Article
In: IEEE Transactions on Neural Systems and Rehabilitation Engineering, 2021.
Abstract | Links | BibTeX | Tags: BCI, Classification, EEG, ERD, Functional connectivity, Motor imagery
@article{Jin2021Graph,
title = {A Novel Classification Framework Using the Graph Representations of Electroencephalogram for Motor Imagery based Brain-Computer Interface},
author = {Jing Jin and Hao Sun and Ian Daly and Shurui Li and Chang Liu and Xingyu Wang and Andrzej Cichocki},
doi = {10.1109/TNSRE.2021.3139095},
year = {2021},
date = {2021-12-28},
journal = {IEEE Transactions on Neural Systems and Rehabilitation Engineering},
abstract = {The motor imagery (MI) based brain-computer interfaces (BCIs) have been proposed as a potential physical rehabilitation technology. However, the low classification accuracy achievable with MI tasks is still a challenge when building effective BCI systems. We propose a novel MI classification model based on measurement of functional connectivity between brain regions and graph theory. Specifically, motifs describing local network structures in the brain are extracted from functional connectivity graphs. A graph embedding model called Ego-CNNs is then used to build a classifier, which can convert the graph from a structural representation to a fixed-dimensional vector for detecting critical structure in the graph. We validate our proposed method on four datasets, and the results show that our proposed method produces high classification accuracies in two-class classification tasks (92.8% for dataset 1, 93.4% for dataset 2, 96.5% for dataset 3, and 80.2% for dataset 4) and multiclass classification tasks (90.33% for dataset 1). Our proposed method achieves a mean Kappa value of 0.88 across nine participants, which is superior to other methods we compared it to. These results indicate that there is a local structural difference in functional connectivity graphs extracted under different motor imagery tasks. Our proposed method has great potential for motor imagery classification in future studies.},
keywords = {BCI, Classification, EEG, ERD, Functional connectivity, Motor imagery},
pubstate = {published},
tppubtype = {article}
}
Jin, Jing; Fang, Hua; Daly, Ian; Xiao, Ruocheng; Miao, Yangyang; Wang, Xingyu; Cichocki, Andrzej
Optimization of Model Training Based on Iterative Minimum Covariance Determinant in Motor-Imagery BCI Journal Article
In: International Journal of Neural Systems, 2021.
BibTeX | Tags: BCI, Classification, EEG, ERD, Machine learning, Motor imagery
@article{Jin2021optMod,
title = {Optimization of Model Training Based on Iterative Minimum Covariance Determinant in Motor-Imagery BCI},
author = {Jing Jin and Hua Fang and Ian Daly and Ruocheng Xiao and Yangyang Miao and Xingyu Wang and Andrzej Cichocki},
year = {2021},
date = {2021-04-18},
journal = {International Journal of Neural Systems},
keywords = {BCI, Classification, EEG, ERD, Machine learning, Motor imagery},
pubstate = {published},
tppubtype = {article}
}
Miao, Yangyang; Jin, Jing; Daly, Ian; Zuo, Cili; Wang, Xingyu; Cichocki, Andrzej; Jung, Tzyy-Ping
Learning Common Time-Frequency-Spatial Patterns for Motor Imagery Classification Journal Article
In: IEEE Transactions on Neural Systems and Rehabilitation Engineering, 2021.
Abstract | Links | BibTeX | Tags: BCI, Classification, EEG, ERD, Event-related potential, Machine learning, Motor imagery
@article{Miao2021,
title = {Learning Common Time-Frequency-Spatial Patterns for Motor Imagery Classification},
author = {Yangyang Miao and Jing Jin and Ian Daly and Cili Zuo and Xingyu Wang and Andrzej Cichocki and Tzyy-Ping Jung},
doi = {10.1109/TNSRE.2021.3071140},
year = {2021},
date = {2021-04-05},
journal = {IEEE Transactions on Neural Systems and Rehabilitation Engineering},
abstract = {The common spatial patterns (CSP) algorithm is the most popular spatial filtering method applied to extract electroencephalogram (EEG) features for motor imagery (MI) based brain-computer interface (BCI) systems. The effectiveness of the CSP algorithm depends on optimal selection of the frequency band and time window from the EEG. Many algorithms have been designed to optimize frequency band selection for CSP, while few algorithms seek to optimize the time window. This study proposes a novel framework, termed common time-frequency-spatial patterns (CTFSP), to extract sparse CSP features from multi-band filtered EEG data in multiple time windows. Specifically, the whole MI period is first segmented into multiple subseries using a sliding time window approach. Then, sparse CSP features are extracted from multiple frequency bands in each time window. Finally, multiple support vector machine (SVM) classifiers with the Radial Basis Function (RBF) kernel are trained to identify the MI tasks and the voting result of these classifiers determines the final output of the BCI. This study applies the proposed CTFSP algorithm to three public EEG datasets (BCI competition III dataset IVa, BCI competition III dataset IIIa, and BCI competition IV dataset 1) to validate its effectiveness, compared against several other state-of-the-art methods. The experimental results demonstrate that the proposed algorithm is a promising candidate for improving the performance of MI-BCI systems.},
keywords = {BCI, Classification, EEG, ERD, Event-related potential, Machine learning, Motor imagery},
pubstate = {published},
tppubtype = {article}
}
2020
Daly, Ian; Rybar, Milan
Neural component analysis for motor imagery classification Conference
EMBC2020, 2020.
BibTeX | Tags: EEG, ERD, Motor imagery
@conference{Daly2020,
title = {Neural component analysis for motor imagery classification},
author = {Ian Daly and Milan Rybar},
year = {2020},
date = {2020-08-01},
booktitle = {EMBC2020},
keywords = {EEG, ERD, Motor imagery},
pubstate = {published},
tppubtype = {conference}
}
2017
Daly, Ian; Blanchard, Caroline; Holmes, Nicholas
Cortical excitability correlates with the event-related desynchronization during brain-computer interface control Journal Article
In: Journal of Neural Engineering, 2017.
BibTeX | Tags: BCI, Cortical excitability, ERD, Motor imagery, TMS
@article{Daly2017TMS,
title = {Cortical excitability correlates with the event-related desynchronization during brain-computer interface control},
author = {Ian Daly and Caroline Blanchard and Nicholas Holmes},
year = {2017},
date = {2017-11-13},
journal = {Journal of Neural Engineering},
keywords = {BCI, Cortical excitability, ERD, Motor imagery, TMS},
pubstate = {published},
tppubtype = {article}
}
2016
Wairagkar, Maitreyee; Daly, Ian; Hayashi, Yoshikatsu; Nasuto, Slawomir
Autocorrelation based EEG Dynamics depicting Motor Intention Conference
BCI Meeting 2016, 2016.
BibTeX | Tags: Autocorrelation, BCI, Classification, EEG, ERD
@conference{Wairagkar2016,
title = {Autocorrelation based EEG Dynamics depicting Motor Intention },
author = {Maitreyee Wairagkar and Ian Daly and Yoshikatsu Hayashi and Slawomir Nasuto},
year = {2016},
date = {2016-06-01},
booktitle = {BCI Meeting 2016},
keywords = {Autocorrelation, BCI, Classification, EEG, ERD},
pubstate = {published},
tppubtype = {conference}
}
2014
Daly, Ian; Williams, Duncan; Hwang, Faustina; Kirke, Alexis; Malik, Asad; Roesch, Etienne; Weaver, James; Miranda, Eduardo; Nasuto, Slawomir
Investigating music tempo as a feedback mechanism for closed-loop BCI control Journal Article
In: Brain-Computer Interfaces, vol. 1, no. 3, pp. 158-169, 2014.
Abstract | Links | BibTeX | Tags: BCI, BCMI, ERD, Motor imagery, Music, Tempo
@article{Daly2014tempoBCI,
title = {Investigating music tempo as a feedback mechanism for closed-loop BCI control},
author = {Ian Daly and Duncan Williams and Faustina Hwang and Alexis Kirke and Asad Malik and Etienne Roesch and James Weaver and Eduardo Miranda and Slawomir Nasuto},
url = {http://www.iandaly.co.uk/wp-content/uploads/2016/01/tempoBCI.pdf},
doi = {10.1080/2326263X.2014.979728},
year = {2014},
date = {2014-10-17},
journal = {Brain-Computer Interfaces},
volume = {1},
number = {3},
pages = {158-169},
abstract = {The feedback mechanism used in a brain-computer interface (BCI) forms an integral part of the closed-loop learning process required for successful operation of a BCI. However, ultimate success of the BCI may be dependent upon the modality of the feedback used. This study explores the use of music tempo as a feedback mechanism in BCI and compares it to the more commonly used visual feedback mechanism. Three different feedback modalities are compared for a kinaesthetic motor imagery BCI: visual, auditory via music tempo, and a combined visual and auditory feedback modality. Visual feedback is provided via the position, on the y-axis, of a moving ball. In the music feedback condition, the tempo of a piece of continuously generated music is dynamically adjusted via a novel music-generation method. All the feedback mechanisms allowed users to learn to control the BCI. However, users were not able to maintain as stable control with the music tempo feedback condition as they could in the visual feedback and combined conditions. Additionally, the combined condition exhibited significantly less inter-user variability, suggesting that multi-modal feedback may lead to more robust results. Finally, common spatial patterns are used to identify participant-specific spatial filters for each of the feedback modalities. The mean optimal spatial filter obtained for the music feedback condition is observed to be more diffuse and weaker than the mean spatial filters obtained for the visual and combined feedback conditions.},
keywords = {BCI, BCMI, ERD, Motor imagery, Music, Tempo},
pubstate = {published},
tppubtype = {article}
}
Wairagkar, Maitreyee; Daly, Ian; Hayashi, Yoshikatsu; Nasuto, Slawomir
Novel single trial movement classification based on temporal dynamics of EEG Conference
Proceedings of the Graz Brain-computer interface conference 2014, 2014.
Abstract | Links | BibTeX | Tags: Autocorrelation, BCI, Classification, EEG, ERD, Motor imagery
@conference{Wairagkar2014,
title = {Novel single trial movement classification based on temporal dynamics of EEG},
author = {Maitreyee Wairagkar and Ian Daly and Yoshikatsu Hayashi and Slawomir Nasuto},
url = {http://centaur.reading.ac.uk/37412/1/Graz%20conference%202014-Final%20version.pdf},
year = {2014},
date = {2014-09-01},
booktitle = {Proceedings of the Graz Brain-computer interface conference 2014},
abstract = {Various complex oscillatory processes are involved in the generation of the motor command. The temporal dynamics of these processes were studied for movement detection from single trial electroencephalogram (EEG). Autocorrelation analysis was performed on the EEG signals to find robust markers of movement detection. The evolution of the autocorrelation function was characterised via the relaxation time of the autocorrelation by exponential curve fitting. It was observed that the decay constant of
the exponential curve increased during movement, indicating that the autocorrelation function decays slowly during motor execution. Significant differences were observed between movement and no moment tasks. Additionally, a linear discriminant analysis (LDA) classifier was used to identify movement trials with a peak accuracy of 74%. },
keywords = {Autocorrelation, BCI, Classification, EEG, ERD, Motor imagery},
pubstate = {published},
tppubtype = {conference}
}
the exponential curve increased during movement, indicating that the autocorrelation function decays slowly during motor execution. Significant differences were observed between movement and no moment tasks. Additionally, a linear discriminant analysis (LDA) classifier was used to identify movement trials with a peak accuracy of 74%.
Daly, Ian; Hallowell, James; Hwang, Faustina; Kirke, Alexis; Malik, Asad; Roesch, Etienne; Weaver, James; Williams, Duncan; Miranda, Eduardo; Nasuto, Slawomir J.
Changes in music tempo entrain movement related brain activity Conference
Engineering in Medicine and Biology Society (EMBC), 2014 36th Annual International Conference of the IEEE, IEEE, 2014, ISSN: 1557-170X.
Links | BibTeX | Tags: EEG, Entrainment, ERD, Music, Tempo
@conference{Daly2014embc,
title = {Changes in music tempo entrain movement related brain activity},
author = {Ian Daly and James Hallowell and Faustina Hwang and Alexis Kirke and Asad Malik and Etienne Roesch and James Weaver and Duncan Williams and Eduardo Miranda and Slawomir J. Nasuto},
url = {http://www.iandaly.co.uk/wp-content/uploads/2016/01/TempoEntrainmentOfERD.pdf},
doi = {10.1109/EMBC.2014.6944647},
issn = {1557-170X},
year = {2014},
date = {2014-08-30},
booktitle = {Engineering in Medicine and Biology Society (EMBC), 2014 36th Annual International Conference of the IEEE},
pages = {4595 - 4598},
publisher = {IEEE},
keywords = {EEG, Entrainment, ERD, Music, Tempo},
pubstate = {published},
tppubtype = {conference}
}
Daly, Ian; Faller, Josef; Scherer, Reinhold; Sweeney-Reed, Catherine; Nasuto, Slawomir J.; Billinger, Martin; Müller-Putz, Gernot
Exploration of the neural correlates of cerebral palsy for sensorimotor BCI control Journal Article
In: Frontiers in Neuroengineering, vol. 7, no. 20, 2014.
Abstract | Links | BibTeX | Tags: BCI, Cerebral palsy, ERD, Motor imagery
@article{Daly2014,
title = {Exploration of the neural correlates of cerebral palsy for sensorimotor BCI control},
author = {Ian Daly and Josef Faller and Reinhold Scherer and Catherine Sweeney-Reed and Slawomir J. Nasuto and Martin Billinger and Gernot Müller-Putz},
url = {http://www.iandaly.co.uk/wp-content/uploads/2016/01/Exploration-of-the-neural-correlates-of-cerebral-palsy-for-sensorimotor-BCI-control.pdf},
doi = {10.3389/fneng.2014.00020},
year = {2014},
date = {2014-07-09},
journal = {Frontiers in Neuroengineering},
volume = {7},
number = {20},
abstract = {Cerebral palsy (CP) includes a broad range of disorders, which can result in impairment of posture and movement control. Brain-computer interfaces (BCIs) have been proposed as assistive devices for individuals with CP. Better understanding of the neural processing underlying motor control in affected individuals could lead to more targeted BCI rehabilitation and treatment options. We have explored well-known neural correlates of movement, including event-related desynchronization (ERD), phase synchrony, and a recently-introduced measure of phase dynamics, in participants with CP and healthy control participants. Although present, significantly less ERD and phase locking were found in the group with CP. Additionally, inter-group differences in phase dynamics were also significant. Taken together these findings suggest that users with CP exhibit lower levels of motor cortex activation during motor imagery, as reflected in lower levels of ongoing mu suppression and less functional connectivity. These differences indicate that development of BCIs for individuals with CP may pose additional challenges beyond those faced in providing BCIs to healthy individuals.},
keywords = {BCI, Cerebral palsy, ERD, Motor imagery},
pubstate = {published},
tppubtype = {article}
}
Müller-Putz, Gernot; Daly, Ian; Kaiser, Vera
Motor imagery induced EEG patterns in spinal cord injury patients and their impact on Brain-Computer Interface accuracy Journal Article
In: Journal of Neural Engineering, vol. 11, no. 3, pp. 1-9, 2014.
Abstract | Links | BibTeX | Tags: BCI, ERD, Functional connectivity, Motor imagery, SCI
@article{Muller-Putz2014,
title = {Motor imagery induced EEG patterns in spinal cord injury patients and their impact on Brain-Computer Interface accuracy},
author = {Gernot Müller-Putz and Ian Daly and Vera Kaiser},
url = {http://www.ncbi.nlm.nih.gov/pubmed/24835837},
doi = {10.1088/1741-2560/11/3/035011},
year = {2014},
date = {2014-06-01},
journal = {Journal of Neural Engineering},
volume = {11},
number = {3},
pages = {1-9},
abstract = {OBJECTIVE:
Assimilating the diagnosis complete spinal cord injury (SCI) takes time and is not easy, as patients know that there is no 'cure' at the present time. Brain-computer interfaces (BCIs) can facilitate daily living. However, inter-subject variability demands measurements with potential user groups and an understanding of how they differ to healthy users BCIs are more commonly tested with. Thus, a three-class motor imagery (MI) screening (left hand, right hand, feet) was performed with a group of 10 able-bodied and 16 complete spinal-cord-injured people (paraplegics, tetraplegics) with the objective of determining what differences were present between the user groups and how they would impact upon the ability of these user groups to interact with a BCI.
APPROACH:
Electrophysiological differences between patient groups and healthy users are measured in terms of sensorimotor rhythm deflections from baseline during MI, electroencephalogram microstate scalp maps and strengths of inter-channel phase synchronization. Additionally, using a common spatial pattern algorithm and a linear discriminant analysis classifier, the classification accuracy was calculated and compared between groups.
MAIN RESULTS:
It is seen that both patient groups (tetraplegic and paraplegic) have some significant differences in event-related desynchronization strengths, exhibit significant increases in synchronization and reach significantly lower accuracies (mean (M) = 66.1%) than the group of healthy subjects (M = 85.1%).
SIGNIFICANCE:
The results demonstrate significant differences in electrophysiological correlates of motor control between healthy individuals and those individuals who stand to benefit most from BCI technology (individuals with SCI). They highlight the difficulty in directly translating results from healthy subjects to participants with SCI and the challenges that, therefore, arise in providing BCIs to such individuals.},
keywords = {BCI, ERD, Functional connectivity, Motor imagery, SCI},
pubstate = {published},
tppubtype = {article}
}
Assimilating the diagnosis complete spinal cord injury (SCI) takes time and is not easy, as patients know that there is no 'cure' at the present time. Brain-computer interfaces (BCIs) can facilitate daily living. However, inter-subject variability demands measurements with potential user groups and an understanding of how they differ to healthy users BCIs are more commonly tested with. Thus, a three-class motor imagery (MI) screening (left hand, right hand, feet) was performed with a group of 10 able-bodied and 16 complete spinal-cord-injured people (paraplegics, tetraplegics) with the objective of determining what differences were present between the user groups and how they would impact upon the ability of these user groups to interact with a BCI.
APPROACH:
Electrophysiological differences between patient groups and healthy users are measured in terms of sensorimotor rhythm deflections from baseline during MI, electroencephalogram microstate scalp maps and strengths of inter-channel phase synchronization. Additionally, using a common spatial pattern algorithm and a linear discriminant analysis classifier, the classification accuracy was calculated and compared between groups.
MAIN RESULTS:
It is seen that both patient groups (tetraplegic and paraplegic) have some significant differences in event-related desynchronization strengths, exhibit significant increases in synchronization and reach significantly lower accuracies (mean (M) = 66.1%) than the group of healthy subjects (M = 85.1%).
SIGNIFICANCE:
The results demonstrate significant differences in electrophysiological correlates of motor control between healthy individuals and those individuals who stand to benefit most from BCI technology (individuals with SCI). They highlight the difficulty in directly translating results from healthy subjects to participants with SCI and the challenges that, therefore, arise in providing BCIs to such individuals.
2013
Daly, Ian; Aloise, Fabio; Arico, Pietro; Belda, Juan; Billinger, Martin; Bolinger, Elizabeth; Cincotti, Febo; Hettich, Dirk; Iosa, Marco; Laparra-Hernandez, Jose; Scherer, Reinhold; Müller-Putz, Gernot
Rapid prototyping for hBCI users with Cerebral palsy Conference
Proceedings of BCI meeting 2013, 2013.
BibTeX | Tags: Cerebral palsy, ERD, Hybrid BCI, Tools
@conference{Daly2013BCImtg,
title = {Rapid prototyping for hBCI users with Cerebral palsy},
author = {Ian Daly and Fabio Aloise and Pietro Arico and Juan Belda and Martin Billinger and Elizabeth Bolinger and Febo Cincotti and Dirk Hettich and Marco Iosa and Jose Laparra-Hernandez and Reinhold Scherer and Gernot Müller-Putz},
year = {2013},
date = {2013-09-01},
booktitle = {Proceedings of BCI meeting 2013},
keywords = {Cerebral palsy, ERD, Hybrid BCI, Tools},
pubstate = {published},
tppubtype = {conference}
}
Daly, Ian; Billinger, Martin; Laparra-Hernandez, Jose; Aloise, Fabio; Garcia, Mariano Lloria; Faller, Josef; Scherer, Reinhold; Muller-Putz, Gernot
On the control of Brain-computer interfaces by users with Cerebral palsy Journal Article
In: Clinical Neurophysiology, vol. 124, no. 9, pp. 1787-1797, 2013.
Abstract | Links | BibTeX | Tags: BCI, Cerebral palsy, ERD, Motor imagery, SSVEP
@article{Daly2013cpBCI,
title = {On the control of Brain-computer interfaces by users with Cerebral palsy},
author = {Ian Daly and Martin Billinger and Jose Laparra-Hernandez and Fabio Aloise and Mariano Lloria Garcia and Josef Faller and Reinhold Scherer and Gernot Muller-Putz},
url = {http://www.iandaly.co.uk/wp-content/uploads/2016/01/draft_6-0.pdf},
doi = {10.1016/j.clinph.2013.02.118},
year = {2013},
date = {2013-09-01},
journal = {Clinical Neurophysiology},
volume = {124},
number = {9},
pages = {1787-1797},
abstract = {OBJECTIVE:
Brain-computer interfaces (BCIs) have been proposed as a potential assistive device for individuals with cerebral palsy (CP) to assist with their communication needs. However, it is unclear how well-suited BCIs are to individuals with CP. Therefore, this study aims to investigate to what extent these users are able to gain control of BCIs.
METHODS:
This study is conducted with 14 individuals with CP attempting to control two standard online BCIs (1) based upon sensorimotor rhythm modulations, and (2) based upon steady state visual evoked potentials.
RESULTS:
Of the 14 users, 8 are able to use one or other of the BCIs, online, with a statistically significant level of accuracy, without prior training. Classification results are driven by neurophysiological activity and not seen to correlate with occurrences of artifacts. However, many of these users' accuracies, while statistically significant, would require either more training or more advanced methods before practical BCI control would be possible.
CONCLUSIONS:
The results indicate that BCIs may be controlled by individuals with CP but that many issues need to be overcome before practical application use may be achieved.
SIGNIFICANCE:
This is the first study to assess the ability of a large group of different individuals with CP to gain control of an online BCI system. The results indicate that six users could control a sensorimotor rhythm BCI and three a steady state visual evoked potential BCI at statistically significant levels of accuracy (SMR accuracies; mean ± STD, 0.821 ± 0.116, SSVEP accuracies; 0.422 ± 0.069).},
keywords = {BCI, Cerebral palsy, ERD, Motor imagery, SSVEP},
pubstate = {published},
tppubtype = {article}
}
Brain-computer interfaces (BCIs) have been proposed as a potential assistive device for individuals with cerebral palsy (CP) to assist with their communication needs. However, it is unclear how well-suited BCIs are to individuals with CP. Therefore, this study aims to investigate to what extent these users are able to gain control of BCIs.
METHODS:
This study is conducted with 14 individuals with CP attempting to control two standard online BCIs (1) based upon sensorimotor rhythm modulations, and (2) based upon steady state visual evoked potentials.
RESULTS:
Of the 14 users, 8 are able to use one or other of the BCIs, online, with a statistically significant level of accuracy, without prior training. Classification results are driven by neurophysiological activity and not seen to correlate with occurrences of artifacts. However, many of these users' accuracies, while statistically significant, would require either more training or more advanced methods before practical BCI control would be possible.
CONCLUSIONS:
The results indicate that BCIs may be controlled by individuals with CP but that many issues need to be overcome before practical application use may be achieved.
SIGNIFICANCE:
This is the first study to assess the ability of a large group of different individuals with CP to gain control of an online BCI system. The results indicate that six users could control a sensorimotor rhythm BCI and three a steady state visual evoked potential BCI at statistically significant levels of accuracy (SMR accuracies; mean ± STD, 0.821 ± 0.116, SSVEP accuracies; 0.422 ± 0.069).
Daly, Ian; Billinger, Martin; Scherer, Reinhold; Muller-Putz, Gernot
Brain-computer interfacing for users with Cerebral palsy, challenges and opportunities Conference
Lecture notes in computer science, 7th International Conference, UAHCI 2013, Held as Part of HCI International 2013, Las Vegas, NV, USA, July 21-26, 2013, Proceedings, Part I, Springer, 2013, ISBN: 978-3-642-39187-3.
Abstract | Links | BibTeX | Tags: BCI, Cerebral palsy, ERD, ERP, SVEP, Tools
@conference{Daly2013HCI,
title = {Brain-computer interfacing for users with Cerebral palsy, challenges and opportunities},
author = {Ian Daly and Martin Billinger and Reinhold Scherer and Gernot Muller-Putz},
url = {http://www.iandaly.co.uk/wp-content/uploads/2016/01/draft_1-1.pdf},
doi = {10.1007/978-3-642-39188-0_67},
isbn = {978-3-642-39187-3},
year = {2013},
date = {2013-07-21},
booktitle = {Lecture notes in computer science, 7th International Conference, UAHCI 2013, Held as Part of HCI International 2013, Las Vegas, NV, USA, July 21-26, 2013, Proceedings, Part I},
journal = {Lecture notes in computer science},
pages = {623-632},
publisher = {Springer},
abstract = {It has been proposed that hybrid Brain-computer interfaces (hBCIs) could benefit individuals with Cerebral palsy (CP). To this end we review the results of two BCI studies undertaken with a total of 20 individuals with CP to determine if individuals in this user group can achieve BCI control.
Large performance differences are found between individuals. These are investigated to determine their possible causes. Differences in subject characteristics are observed to significantly relate to BCI performance accuracy. Additionally, significant relationships are also found between some subject characteristics and EEG components that are important for BCI control. Therefore, it is suggested that knowledge of individual users may guide development towards overcoming the challenges involved in providing BCIs that work well for individuals with CP.},
keywords = {BCI, Cerebral palsy, ERD, ERP, SVEP, Tools},
pubstate = {published},
tppubtype = {conference}
}
Large performance differences are found between individuals. These are investigated to determine their possible causes. Differences in subject characteristics are observed to significantly relate to BCI performance accuracy. Additionally, significant relationships are also found between some subject characteristics and EEG components that are important for BCI control. Therefore, it is suggested that knowledge of individual users may guide development towards overcoming the challenges involved in providing BCIs that work well for individuals with CP.
Scherer, Reinhold; Moitzi, Gunther; Daly, Ian; Müller-Putz, Gernot
On the use of games for non-invasive EEG-based Functional Brain Mapping Journal Article
In: IEEE Transactions on Computational Intelligence and AI in Games, vol. 5, no. 2, pp. 155-163, 2013.
Abstract | Links | BibTeX | Tags: BCI, ERD, Games, Kinect, Motor imagery
@article{Scherer2013,
title = {On the use of games for non-invasive EEG-based Functional Brain Mapping},
author = {Reinhold Scherer and Gunther Moitzi and Ian Daly and Gernot Müller-Putz},
url = {https://www.google.co.uk/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0ahUKEwivypDisKzKAhWDaxQKHSN7CVgQFgggMAA&url=http%3A%2F%2Fieeexplore.ieee.org%2Fiel7%2F4804728%2F6527957%2F06472046.pdf%3Farnumber%3D6472046&usg=AFQjCNF1qrlxBoeaT4OaHviOGyqy6IZmNg&sig2=lgQU_N9tXnpU7wRB3M9Efg},
doi = {10.1109/TCIAIG.2013.2250287},
year = {2013},
date = {2013-06-01},
journal = {IEEE Transactions on Computational Intelligence and AI in Games},
volume = {5},
number = {2},
pages = {155-163},
abstract = {The use of statistical models and statistical inference
for characterizing the interplay between brain structures and
human behavior (functional brain mapping) is common in neuroscience.
Statistical methods, however, require the availability of
sufficiently large data sets. As a result, experimental paradigms
used to collect behavioral trials from individuals are data centered
and not user centered. This means that experimental paradigms
are tuned to collect as many trials as possible, are generally rather
demanding, and are not always motivating or engaging for individuals.
Subject cooperation and their compliance with the task may
decrease over time. Whenever possible, paradigms are designed
to control for factors such as fatigue, attention, and motivation.
In this paper, we propose the use of the Kinect motion tracking
sensor (Microsoft, Inc., Redmond, WA, USA) in a game-based
paradigm for noninvasive electroencephalogram (EEG)-based
functional motor mapping. Results from an experimental study
with able-bodied subjects playing a virtual ball game suggest
that the Kinect sensor is useful for isolating specific movements
during the interaction with the game, and that the computed EEG
patterns for hand and feet movements are in agreement with
results described in the literature},
keywords = {BCI, ERD, Games, Kinect, Motor imagery},
pubstate = {published},
tppubtype = {article}
}
for characterizing the interplay between brain structures and
human behavior (functional brain mapping) is common in neuroscience.
Statistical methods, however, require the availability of
sufficiently large data sets. As a result, experimental paradigms
used to collect behavioral trials from individuals are data centered
and not user centered. This means that experimental paradigms
are tuned to collect as many trials as possible, are generally rather
demanding, and are not always motivating or engaging for individuals.
Subject cooperation and their compliance with the task may
decrease over time. Whenever possible, paradigms are designed
to control for factors such as fatigue, attention, and motivation.
In this paper, we propose the use of the Kinect motion tracking
sensor (Microsoft, Inc., Redmond, WA, USA) in a game-based
paradigm for noninvasive electroencephalogram (EEG)-based
functional motor mapping. Results from an experimental study
with able-bodied subjects playing a virtual ball game suggest
that the Kinect sensor is useful for isolating specific movements
during the interaction with the game, and that the computed EEG
patterns for hand and feet movements are in agreement with
results described in the literature
Chen, Xiaogang; Bin, Guangyu; Daly, Ian; Gao, Xiaorong
Event-related desynchronization (ERD) in the alpha band during a hand mental rotation task Journal Article
In: Neuroscience Letters, vol. 541, pp. 238-242, 2013.
Abstract | Links | BibTeX | Tags: EEG, ERD, Hand rotation
@article{Chen2013a,
title = {Event-related desynchronization (ERD) in the alpha band during a hand mental rotation task},
author = {Xiaogang Chen and Guangyu Bin and Ian Daly and Xiaorong Gao},
url = {http://www.ncbi.nlm.nih.gov/pubmed/23458675},
doi = {10.1016/j.neulet.2013.02.036},
year = {2013},
date = {2013-04-29},
journal = {Neuroscience Letters},
volume = {541},
pages = {238-242},
abstract = {Recent studies have demonstrated that mentally rotating the hands involves participants engaging in motor imagery processing. However, far less is known about the possible neurophysiological basis of such processing. To contribute to a better understanding of hand mental rotation processing, event-related spectral perturbation (ERSP) methods were applied to electroencephalography (EEG) data collected from participants mentally rotating their hands. Time-frequency analyses revealed that alpha-band power suppression was larger over central-parietal regions. This is in accordance with motor imagery findings suggesting that the motor regions may be involved in processing or detection of kinaesthetic information. Furthermore, the presence of a significant negative correlation between reaction times (RTs) and alpha-band power suppression over central regions is illustrated. These findings are consistent with the neural efficiency hypothesis, which proposes the non-use of many brain regions irrelevant for the task performance as well as the more focused use of specific task-related regions in individuals with better performance. These results indicate that ERSP provides some independent insights into the mental rotation process and further confirms that parietal and motor cortices are involved in mental rotation.},
keywords = {EEG, ERD, Hand rotation},
pubstate = {published},
tppubtype = {article}
}
2012
Daly, Ian; Grissmann, Sebastian; Brunner, Clemens; Allison, Brendan Z.; Müller-Putz, Gernot
Hybrid BCI classification via dynamic re-weighting Conference
Proceedings of the 3rd TOBI workshop, Würzburg, Germany, 2012.
Abstract | BibTeX | Tags: Classifier, EEG, ERD, Hybrid BCI, SSVEP
@conference{Daly2012,
title = {Hybrid BCI classification via dynamic re-weighting},
author = {Ian Daly and Sebastian Grissmann and Clemens Brunner and Brendan Z. Allison and Gernot Müller-Putz},
year = {2012},
date = {2012-10-01},
booktitle = {Proceedings of the 3rd TOBI workshop, Würzburg, Germany},
abstract = {A hybrid brain-computer interface (hBCI) may combine two or more BCI paradigms with the objective of improving performance (accuracy, stability, bit rate etc.) over that achievable with a single paradigm. However, the approach taken in some recent hBCI studies did not achieve accuracies significantly better than a single paradigm. Therefore, we introduce a re-weighting method for classifying a hybrid feature set. This approach produces higher accuracies than with the ERD paradigm.},
keywords = {Classifier, EEG, ERD, Hybrid BCI, SSVEP},
pubstate = {published},
tppubtype = {conference}
}
Kaiser, Vera; Daly, Ian; Pichiorri, Floriana; Mattia, Donatella; Muller-Putz, Gernot R.; Neuper, Christa
Relationship between electrical brain responses to motor imagery and motor impairment in stroke. Journal Article
In: Stroke, vol. 43, no. 10, pp. 2735-2740, 2012.
Abstract | Links | BibTeX | Tags: BCI, ERD, Motor imagery, Stroke
@article{Kaiser2012stroke,
title = {Relationship between electrical brain responses to motor imagery and motor impairment in stroke.},
author = {Vera Kaiser and Ian Daly and Floriana Pichiorri and Donatella Mattia and Gernot R. Muller-Putz and Christa Neuper},
doi = {10.1161/STROKEAHA.112.665489},
year = {2012},
date = {2012-08-14},
journal = {Stroke},
volume = {43},
number = {10},
pages = {2735-2740},
abstract = {BACKGROUND AND PURPOSE:
New strategies like motor imagery based brain-computer interfaces, which use brain signals such as event-related desynchronization (ERD) or event-related synchronization (ERS) for motor rehabilitation after a stroke, are undergoing investigation. However, little is known about the relationship between ERD and ERS patterns and the degree of stroke impairment. The aim of this work was to clarify this relationship.
METHODS:
EEG during motor imagery and execution were measured in 29 patients with first-ever monolateral stroke causing any degree of motor deficit in the upper limb. The strength and laterality of the ERD or ERS patterns were correlated with the scores of the European Stroke Scale, the Medical Research Council, and the Modified Ashworth Scale.
RESULTS:
Mean age of the patients was 58 ± 15 years; mean time from the incident was 4 ± 4 months. Stroke lesions were cortical (n=8), subcortical (n=11), or mixed (n=10), attributable to either an ischemic event (n=26) or a hemorrhage (n=3), affecting the right (n=16) or left (n=13) hemisphere. Higher impairment was related to stronger ERD in the unaffected hemisphere and higher spasticity was related to stronger ERD in the affected hemisphere. Both were related to a relatively stronger ERS in the affected hemisphere.
CONCLUSIONS:
The results of this study may have implications for the design of potential poststroke rehabilitation interventions based on brain-computer interface technologies that use neurophysiological signals like ERD or ERS as neural substrates for the mutual interaction between brain and machine and, ultimately, help stroke patients to regain motor control.},
keywords = {BCI, ERD, Motor imagery, Stroke},
pubstate = {published},
tppubtype = {article}
}
New strategies like motor imagery based brain-computer interfaces, which use brain signals such as event-related desynchronization (ERD) or event-related synchronization (ERS) for motor rehabilitation after a stroke, are undergoing investigation. However, little is known about the relationship between ERD and ERS patterns and the degree of stroke impairment. The aim of this work was to clarify this relationship.
METHODS:
EEG during motor imagery and execution were measured in 29 patients with first-ever monolateral stroke causing any degree of motor deficit in the upper limb. The strength and laterality of the ERD or ERS patterns were correlated with the scores of the European Stroke Scale, the Medical Research Council, and the Modified Ashworth Scale.
RESULTS:
Mean age of the patients was 58 ± 15 years; mean time from the incident was 4 ± 4 months. Stroke lesions were cortical (n=8), subcortical (n=11), or mixed (n=10), attributable to either an ischemic event (n=26) or a hemorrhage (n=3), affecting the right (n=16) or left (n=13) hemisphere. Higher impairment was related to stronger ERD in the unaffected hemisphere and higher spasticity was related to stronger ERD in the affected hemisphere. Both were related to a relatively stronger ERS in the affected hemisphere.
CONCLUSIONS:
The results of this study may have implications for the design of potential poststroke rehabilitation interventions based on brain-computer interface technologies that use neurophysiological signals like ERD or ERS as neural substrates for the mutual interaction between brain and machine and, ultimately, help stroke patients to regain motor control.
2011
Daly, Ian; Nasuto, Slawomir J.; Warwick, Kevin
Single tap identification for fast BCI control Journal Article
In: Cognitive Neurodynamics, vol. 5, no. 1, pp. 21-30, 2011, ISSN: 1871-4080.
Abstract | Links | BibTeX | Tags: BCI, DE, ERD, Features selection, Finger tapping, Single trial
@article{Daly2010,
title = {Single tap identification for fast BCI control},
author = {Ian Daly and Slawomir J. Nasuto and Kevin Warwick},
url = {http://www.iandaly.co.uk/wp-content/uploads/2016/01/Single-tap-identification-for-fast-BCI-control.pdf},
doi = {10.1007/s11571-010-9133-x},
issn = {1871-4080},
year = {2011},
date = {2011-03-01},
journal = {Cognitive Neurodynamics},
volume = {5},
number = {1},
pages = {21-30},
abstract = {One of the major aims of BCI research is devoted to achieving faster and more efficient control of external devices. The identification of individual tap events in a motor imagery BCI is therefore a desirable goal. EEG is recorded from subjects performing and imagining finger taps with their left and right hands. A Differential Evolution based feature selection wrapper is used in order to identify optimal features in the spatial and frequency domains for tap identification. Channel-frequency band combinations are found which allow differentiation of tap vs. no-tap control conditions for executed and imagined taps. Left vs. right hand taps may also be differentiated with features found in this manner. A sliding time window is then used to accurately identify individual taps in the executed tap and imagined tap conditions. Highly statistically significant classification accuracies are achieved with time windows of 0.5 s and more allowing taps to be identified on a single trial basis.},
keywords = {BCI, DE, ERD, Features selection, Finger tapping, Single trial},
pubstate = {published},
tppubtype = {article}
}