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Published Online
on April 24, 2002

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The Journal of Neuroscience, 2002, 22:RC219:1-5

RAPID COMMUNICATION
Apparent Motion: Event-Related Functional Magnetic Resonance Imaging of Perceptual Switches and States

Lars Muckli¹, Nikolaus Kriegeskorte^{1, 2}, Heinrich Lanfermann³, Friedhelm E. Zanella³, Wolf Singer¹, and Rainer Goebel^{1, 2}

¹ Max Planck Institute for Brain Research, Neurophysiology, 60528 Frankfurt am Main, Germany, ² Department of Psychology, Neurocognition, University of Maastricht, 6200MD Maastricht, The Netherlands, and ³ Department of Neuroradiology, Johann Wolfgang Goethe University, 60590 Frankfurt am Main, Germany

When spatially segregated visual stimuli are presented in alternation, subjects may perceive a single stimulus moving between the two positions (apparent motion). By adjusting spatial and temporal parameters, an ambiguous condition can be created in which perception of back-and-forth motion alternates with the perception of two stationary blinking stimuli. We presented subjects with such ambiguous stimuli, asked them to signal periods of perceived motion and blinking, and measured brain activity with functional magnetic resonance imaging. Multiple regression analysis revealed that early visual areas responded with equal strength during both perceptual conditions, whereas hMT+(V5) (the human motion complex that includes the human homolog of MT and its satellites) was more active during the perception of apparent motion. These results indicate that neurons in hMT+ participate in the constructive process that creates a continuous motion percept from a discontinuous visual input.

Key words: multistable vision; motion perception; apparent motion; apparent motion breakdown; human motion complex; MT; V5; perceptual switches; functional magnetic resonance imaging; BOLD; event-related

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Copyright © Society for Neuroscience  0270-6474//$05.00/0

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