02955nas a2200289   4500008004100000245010000041210006900141260001200210490000700222520214900229653000802378653003102386653000902417653001002426653002302436653001402459653001102473100001602484700001302500700001402513700001302527700001302540700001802553700001302571700001402584856006702598       2018                        eng d00aReal-time detection and discrimination of visual perception using electrocorticographic signals0 aRealtime detection and discrimination of visual perception using  c02/20180 v153 aSeveral neuroimaging studies have demonstrated that the ventral temporal cortex contains specialized regions that process visual stimuli. This study investigated the spatial and temporal dynamics of electrocorticographic (ECoG) responses to different types and colors of visual stimulation that were presented to four human participants, and demonstrated a real-time decoder that detects and discriminates responses to untrained natural images. Approach. ECoG signals from the participants were recorded while they were shown colored and greyscale versions of seven types of visual stimuli (images of faces, objects, bodies, line drawings, digits, and kanji and hiragana characters), resulting in 14 classes for discrimination (experiment I). Additionally, a real-time system asynchronously classified ECoG responses to faces, kanji and black screens presented via a monitor (experiment II), or to natural scenes (i.e. the face of an experimenter, natural images of faces and kanji, and a mirror) (experiment III). Outcome measures in all experiments included the discrimination performance across types based on broadband γ activity. Main results. Experiment I demonstrated an offline classification accuracy of 72.9% when discriminating among the seven types (without color separation). Further discrimination of grey versus colored images reached an accuracy of 67.1%. Discriminating all colors and types (14 classes) yielded an accuracy of 52.1%. In experiment II and III, the real-time decoder correctly detected 73.7% responses to face, kanji and black computer stimuli and 74.8% responses to presented natural scenes. Significance. Seven different types and their color information (either grey or color) could be detected and discriminated using broadband γ activity. Discrimination performance maximized for combined spatial-temporal information. The discrimination of stimulus color information provided the first ECoG-based evidence for color-related population-level cortical broadband γ responses in humans. Stimulus categories can be detected by their ECoG responses in real time within 500 ms with respect to stimulus onset.10aBCI10aBrain–computer interface10aECoG10agamma10ahigh gamma mapping10areal-time10avisual1 aKapeller, C1 aOgawa, H1 aSchalk, G1 aKunii, N1 aCoon, WG1 aScharinger, J1 aGuger, C1 aKamada, K  uhttp://iopscience.iop.org/article/10.1088/1741-2552/aaa9f6/pdf00626nas a2200157   4500008004100000245011100041210006900152100001600221700001600237700002100253700002100274700001900295700001400314700001300328856012700341       2013                        eng d00acortiQ – Clinical Software for Electrocorticographic Real-Time Functional Mapping of the Eloquent Cortex0 acortiQ Clinical Software for Electrocorticographic RealTime Func1 aPrueckl, R.1 aKapeller, C1 aPotes, Cristhian1 aKorostenskaja, M1 aSchalk, Gerwin1 aLee, K.H.1 aGuger, C  uhttps://www.neurotechcenter.org/publications/cortiq-%E2%80%93-clinical-software-electrocorticographic-real-time-functional