Journal
JOURNAL OF NEUROSCIENCE
Volume 25, Issue 44, Pages 10101-10104Publisher
SOC NEUROSCIENCE
DOI: 10.1523/JNEUROSCI.2998-05.2005
Keywords
perception; gamma band; binding; EEG; coherence; neural coupling
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Spatially separated visual objects that appear in alternating sequence can be perceived as a single moving object. This phenomenon of apparent motion enables us to perceive sequentially presented images as a motion picture. How does the visual system bind together single visual tokens to one moving object? Here we report a series of experiments investigating apparent motion with electroencephalo-graphic recordings showing that gamma-band oscillatory coupling in the visual cortex is crucial for this phenomenon. We used an ambiguous stimulus that could be perceived as moving either vertically or horizontally. Because visual information from the right and left visual hemifields is routed to the contralateral early visual cortex, in the case of perceived horizontal movement, information from both hemispheres has to be integrated. In accord with this assumption, our data show stronger oscillatory coupling between right and left visual cortices during perception of horizontal motion compared with vertical motion.
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