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Torben Ellegaard Lund

Images of illusory motion in primary visual cortex

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  • Axel Larsen, Denmark
  • Kristoffer H Madsen, Denmark
  • Torben E Lund
  • Claus Bundesen, Denmark
Illusory motion can be generated by successively flashing a stationary visual stimulus in two spatial locations separated by several degrees of visual angle. In appropriate conditions, the apparent motion is indistinguishable from real motion: The observer experiences a luminous object traversing a continuous path from one stimulus location to the other through intervening positions where no physical stimuli exist. The phenomenon has been extensively investigated for nearly a century but little is known about its neurophysiological foundation. Here we present images of activations in the primary visual cortex in response to real and apparent motion. The images show that during apparent motion, a path connecting the cortical representations of the stimulus locations is filled in by activation. The activation along the path of apparent motion is similar to the activation found when a stimulus is presented in real motion between the two locations.
Original languageEnglish
JournalJournal of Cognitive Neuroscience
Volume18
Issue7
Pages (from-to)1174-80
Number of pages6
ISSN0898-929X
DOIs
Publication statusPublished - 2006
Externally publishedYes

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