Gaze independent brain–computer speller with covert visual search tasks

Liu, Yang; Zhou, Zongtan; Hu, Dewen

doi:10.1016/j.clinph.2010.10.049

Cited by 71 publications

(49 citation statements)

References 31 publications

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“…Zhang et al (2012) reported that N170 and vertex positive potentials (VPP) also improved the classification accuracy of P300 BCIs with stimuli that changed to faces (Zhang et al, 2012). However, while these researches succeeded in improving the reliability of identifying target flashes (Liu et al, 2010;Townsend et al, 2012), there was another method that could further increase the ERP-based BCIs. Some studies were focused on decreasing the interference by reducing the number of adjacent flashes (Frye et al, 2011;Liu et al, 2010;Townsend et al, 2010).…”

Section: Introductionmentioning

confidence: 91%

“…However, while these researches succeeded in improving the reliability of identifying target flashes (Liu et al, 2010;Townsend et al, 2012), there was another method that could further increase the ERP-based BCIs. Some studies were focused on decreasing the interference by reducing the number of adjacent flashes (Frye et al, 2011;Liu et al, 2010;Townsend et al, 2010). But increasing the number of flashes of each trial would reduce the speed of the BCI systems.…”

Section: Introductionmentioning

confidence: 97%

“…In order to improve the performance of P300 BCIs, many studies were focused on the signal processing and pattern recognition methods to increase the classification accuracy of P300 BCIs (Aloise et al, 2011;Blankertz et al, 2011;Brunner et al, 2010;Cichocki et al, 2008;Emily et al, 2010;Hoffmann et al, 2008;Lotte et al, 2007;Mugler et al, 2008;Speier et al, 2013;Xu et al, 2004). Optimized paradigms to evoke event related potentials (ERPs) were designed to expand the applicability for Amyotrophic Lateral Sclerosis (ALS) sufferers and Spinal Cord Injury patients (Liu et al, 2010;Rohm et al, 2013;Treder et al, 2011). The stimuli configuration was optimized to improve the reliability of the P300 speller systems (Jin et al, 2011;Townsend et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A survey of the dummy face and human face stimuli used in BCI paradigm

Chen

Jin

Wang

et al. 2015

Journal of Neuroscience Methods

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Section: Introductionmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A survey of the dummy face and human face stimuli used in BCI paradigm

Chen

Jin

Wang

et al. 2015

Journal of Neuroscience Methods

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“…These enhancements are construed to reflect an attentional amplification of localized sensory information at the level of visual pathways [11]. Such a modality has been already explored for control of BCI communication devices (e.g., P300-Speller [13], Hex-O-Spell [14]). …”

Section: Introductionmentioning

confidence: 99%

An online EEG BCI based on covert visuospatial attention in absence of exogenous stimulation

et al. 2013

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Objective. In this work we present-for the first time-the online operation of an electroencephalogram (EEG) brain-computer interface (BCI) system based on covert visuospatial attention (CVSA), without relying on any evoked responses. Electrophysiological correlates of pure top-down CVSA have only recently been proposed as a control signal for BCI. Such systems are expected to share the ease of use of stimulus-driven BCIs (e.g. P300, steady state visually evoked potential) with the autonomy afforded by decoding voluntary modulations of ongoing activity (e.g. motor imagery). Approach. Eight healthy subjects participated in the study. EEG signals were acquired with an active 64-channel system. The classification method was based on a time-dependent approach tuned to capture the most discriminant spectral features of the temporal evolution of attentional processes. The system was used by all subjects over two days without retraining, to verify its robustness and reliability. Main results. We report a mean online accuracy across the group of 70.6 ± 1.5%, and 88.8 ± 5.8% for the best subject. Half of the participants produced stable features over the entire duration of the study. Additionally, we explain drops in performance in subjects showing stable features in terms of known electrophysiological correlates of fatigue, suggesting the prospect of online monitoring of mental states in BCI systems. Significance. This work represents the first demonstration of the feasibility of an online EEG BCI based on CVSA. The results achieved suggest the CVSA BCI as a promising alternative to standard BCI modalities.

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“…Recently proposed paradigms may provide a communication channel even in this case, e.g. by using covert visual paradigms [17], [1], [29] or by exploiting the auditory modality [14], [8], [9], [12], [30], [2], [11], [25], [16], [10].…”

Section: Introductionmentioning

confidence: 99%

No surprise - fixed sequence event-related potentials for brain-computer interfaces

Tangermann

Höhne

Stecher

et al. 2012

2012 Annual International Conference of the IEEE Engineering in Medicine and Biology Society

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Abstract-Introduction: In the field of Brain-Computer Interfaces (BCI), the original two-class oddball paradigm has been extended to multiple stimuli with balanced probabilities and random presentation sequences. Exploiting the differences between standard and deviant ERP responses, these multi-class paradigms are suitable for communication and control. Methods: The present study investigates the effect of giving up the randomness of stimulation sequences in favor of a repeated, predictable pattern. Data of healthy subjects (n=10) who performed a single session with a 6-class spatial auditory ERP paradigm were analyzed offline. Their auditory evoked potentials (AEP) resulting from the potentially simpler task (using fixed sequences) are compared with the AEP evoked by pseudo-randomized stimulation sequences. Results: Class-discriminative EEG responses between target and non-target stimuli were observed for both conditions. The binary classification error estimated for standard epochs of was comparable for both conditions (random: 24%, fixed: 25%). Expanding the standard epochs to include pre-stimulus intervals, we found that the regular structure of the fixed sequence can be exploited. Compared to the standard epoch, the MSE improves by 7%, while in the random condition an improvement could not be observed.

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Gaze independent brain–computer speller with covert visual search tasks

Cited by 71 publications

References 31 publications

A survey of the dummy face and human face stimuli used in BCI paradigm

A survey of the dummy face and human face stimuli used in BCI paradigm

An online EEG BCI based on covert visuospatial attention in absence of exogenous stimulation

No surprise - fixed sequence event-related potentials for brain-computer interfaces

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