Pre- and post-stimulus EEG patterns associated with the touch-induced illusory flash.
Pairing two brief auditory beeps with a single flash can evoke the percept of a second, illusory, flash. Investigations of the underlying neural mechanisms are limited to post-stimulus effects of this sound-induced illusory flash. We investigated whether touch modulates the visual evoked potential in a similar vein, and also looked at pre-stimulus activity. Electroencephalogram (EEG) was recorded over occipital and parieto-occipital areas of 12 observers. We compared bimodal EEG to its unimodal constituents (i.e., the difference waves) and found significant positive deflections around 110 ms and 200 ms and negative deflections around 330 ms and 390 ms from stimulus onset. These results are similar to those reported for the sound-induced illusion, albeit somewhat later. Furthermore, comparison of the EEG activity between those trials in which the illusion was perceived and those in which it was absent revealed that the phase of pre-stimulus alpha was linked to perceiving the illusion or not. We conclude that touch can modulate activity in the visual cortex and that similar neural mechanisms underlie perception of the sound- and touch-induced illusory flash and that the phase of the alpha wave at the moment of presentation that affects perception.
Department Perceptual and Cognitive Systems, TNO, Kampweg 5, 3769 DE Soesterberg, The Netherlands. Electronic address: jan.vanerp@tno.nl.
Jan B F
JB
van Erp
Department Perceptual and Cognitive Systems, TNO, Kampweg 5, 3769 DE Soesterberg, The Netherlands; Department of Information and Computing Sciences, Utrecht University, Princetonplein 5, 3584 CC Utrecht, The Netherlands.
Tom G
TG
Philippi
Department Perceptual and Cognitive Systems, TNO, Kampweg 5, 3769 DE Soesterberg, The Netherlands; Department of Information and Computing Sciences, Utrecht University, Princetonplein 5, 3584 CC Utrecht, The Netherlands.
Ksander N
KN
de Winkel
Department of Information and Computing Sciences, Utrecht University, Princetonplein 5, 3584 CC Utrecht, The Netherlands.
Peter
P
Werkhoven
D000161:Acoustic Stimulation / Q000379:methods; D000328:Adult; D001307:Auditory Perception / Q000502:physiology*; D004569:Electroencephalography; D005260:Female; D006801:Humans; D007088:Illusions / Q000502:physiology*; D008297:Male; D010775:Photic Stimulation / Q000379:methods; D011930:Reaction Time / Q000502:physiology; D013016:Sound; D014110:Touch / Q000502:physiology*; D014793:Visual Cortex / Q000502:physiology*; D014796:Visual Perception / Q000502:physiology; D055815:Young Adult
Alpha; EEG; Illusion; Illusory flash; Multisensory; Pre-stimulus