title: Retinotopic activity in V1 reflects the perceived and not the retinal size of an afterimage.
abstract: An afterimage looks larger when one fixates on a distant than on a closer surface. We show that the retinotopic activity in the primary visual cortex (V1) associated with viewing an afterimage is modulated by perceived size, even when the size of the retinal image remains constant. This suggests that V1 has an important role in size constancy when the viewing distance of the stimulus changes.
authors.affiliation: The Brain and Mind Institute, The University of Western Ontario, London, Ontario, Canada.
authors.forename: Irene
authors.initials: I
authors.lastname: Sperandio
authors.forename: Philippe A
authors.initials: PA
authors.lastname: Chouinard
authors.forename: Melvyn A
authors.initials: MA
authors.lastname: Goodale
mesh_terms: D000328:Adult; D000360:Afterimage / Q000502:physiology*; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods; D010775:Photic Stimulation / Q000379:methods*; D012160:Retina / Q000502:physiology*; D012858:Size Perception / Q000502:physiology*; D013997:Time Factors; D014793:Visual Cortex / Q000502:physiology*; D014796:Visual Perception / Q000502:physiology*; D055815:Young Adult