The neural mechanism underlying illusory complex motions
Junxiang Luo1,2; Keyan He1,2; Xiaohong Li1; Ian Max Andolian1; Jiapeng Yin1; Yong Gu1; Wei Wang1
Conference Name2017年第二届曲阜视觉科学会议
Correspondent ;
Conference Date2017.7.2
Conference Place曲阜

PURPOSE: The Pinna illusion is a striking example of the perception of complex motion (rotation and radiation) in the absence of physical motion. For example, upon physically approaching or receding from the Pinna-Brelstaff figure, the observer experiences vivid illusory counter rotation of the figure. This visual phenomenon of illusory rotary motion is a well-known example of integration of local cues to form a global percept. Using psychophysical tests and functional magnetic resonance imaging (fMRI) of visual cortices, we recently found that the Pinna-Brelstaff figure (illusory rotation) and a real physical rotation control stimulus both predominantly activated subarea MST in hMT+, each with a similar response intensity. However, the detailed neural mechanisms underlying the Pinna illusory rotation as well as radiation remain unknown.
METHODS: By manipulation of the physical characteristics of the Pinna-Brelstaff figure, we could generate different types of illusory complex motion: rotation, expansion and contraction (radiation). We first test the illusory effect in human and nonhuman primate psychophysically, and then performed single-unit recordings of MST and MT in awake macaques.
RESULTS: We found that up to two-thirds of MST neurons encode Pinna illusory complex motions, with similar tuning preferences to their corresponding real physical motions. A subset of MT neurons was found to encode the local motion signals with earlier response latency than MST neurons.
CONCLUSIONS: These results demonstrate that neurons in area MST but not MT respond equivalently and respectively to Pinna illusory and real rotations, expansions and contractions. These findings suggest that the representation of illusory and real complex motion fields in primate MST relies on a similar cascade of neural integrative mechanisms from earlier visual areas to generate a global motion perception.

Keywordmotion illusion MST MT human and non-human primate psychophysics electrophysiological single-unite recording
Subject Area视觉神经科学
Document Type会议论文
Affiliation1.Institute of Neuroscience, State Key Laboratory of Neuroscience, Key Laboratory of Primate Neurobiology, Chinese Academy of Sciences
2.University of Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Junxiang Luo,Keyan He,Xiaohong Li,et al. The neural mechanism underlying illusory complex motions[C],2017.
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