Journal Article Novel method of extracting motion from natural movies

Suzuki, Wataru  ,  Ichinohe, Noritaka  ,  Tani, Toshiki  ,  Hayami, Taku  ,  Miyakawa, Naohisa  ,  Watanabe, Satoshi  ,  Takeichi, Hiroshige

tBackground: The visual system in primates can be segregated into motion and shape pathways. Interactionoccurs at multiple stages along these pathways. Processing of shape-from-motion and biological motionis considered to be a higher-order integration process involving motion and shape information. However,relatively limited types of stimuli have been used in previous studies on these integration processes.New method: We propose a new algorithm to extract object motion information from natural movies andto move random dots in accordance with the information. The object motion information is extracted byestimating the dynamics of local normal vectors of the image intensity projected onto the x-y plane ofthe movie.Results: An electrophysiological experiment on two adult common marmoset monkeys (Callithrix jacchus)showed that the natural and random dot movies generated with this new algorithm yielded comparableneural responses in the middle temporal visual area.Comparison with existing methods: In principle, this algorithm provided random dot motion stimuli con-taining shape information for arbitrary natural movies. This new method is expected to expand theneurophysiological and psychophysical experimental protocols to elucidate the integration processingof motion and shape information in biological systems.Conclusions: The novel algorithm proposed here was effective in extracting object motion informationfrom natural movies and provided new motion stimuli to investigate higher-order motion informationprocessing.© 2017 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license(

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