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Working paper

Exploratory meg study of the illusory contour perception: positive and inverted effects

Evina E., Pronko P. K., Goyaeva D. E., Chernyshev B. V.
The illusory contour is one of the most often used models in studies of Gestalt perception. In our MEG study we observed the so-called illusory contour effect (IC-effect): the activity of non-primary visual and associative cortical areas was increased during the 150-250 ms time window after a stimulus onset in response to illusory stimulus, compared with the control stimulus. In addition to the positive IC-effect, the inverted IC-effect was revealed for the first time in adults. In our study it was manifested during the 60-120 ms window after the onset of stimulus. The in-verted IC-effect is an early decrease in the activity of the visual cortex in response to the illusory contour compared with the control stimulus. The mechanism of the inverted IC-effect is yet un-clear. The “bottom-up” and “top-down” hypotheses of the origin of the inverted IC-effect are discussed.