An event-related potential investigation of the time-course of temporal ventriloquism.
Temporal ventriloquism refers to the phenomenon that a sound presented in close temporal proximity of a visual stimulus attracts its perceived temporal occurrence. Here, we investigate the time-course of the neuronal processes underlying temporal ventriloquism, using event-related brain potentials. To measure shifts in perceived temporal visual occurrence, we used a paradigm in which a sound modulates the magnitude of a visual illusion called the flash-lag effect. A sound presented before the flash reduced both the size of the flash-lag effect and the amplitude of visual N1 compared with when the sound lagged the flash. We attribute the modulation of the flash-lag effect to a modulation of facilitation of visual processing. The time-course (190 ms) and localization (occipitoparietal cortex) of this particular auditory-visual interaction confirms the sensory nature of temporal ventriloquism.
Stekelenburg
Jeroen J
JJ
Psychonomics Laboratory, Tilburg University, PO Box 90153, 5000 LE Tilburg, The Netherlands. J.J.Stekelenburg@uvt.nl
Vroomen
Jean
J
D000293:Adolescent; D000328:Adult; D004569:Electroencephalography; D005072:Evoked Potentials, Auditory / Q000502:physiology*; D005074:Evoked Potentials, Visual / Q000502:physiology*; D005260:Female; D006801:Humans; D007088:Illusions / Q000502:physiology; D008297:Male; D009778:Occipital Lobe / Q000502:physiology*; D010296:Parietal Lobe / Q000502:physiology*; D010470:Perceptual Masking / Q000502:physiology*; D011930:Reaction Time / Q000502:physiology