Motion opponency at the middle temporal cortex: Preserved motion information and the effect of perceptual learning

Alexander Yu; Ruizhe Zhang; Andrew E. SilvaYang XingBenjamin ThompsonZili Liu

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Motion opponency at the middle temporal cortex: Preserved motion information and the effect of perceptual learning

机译：Motion opponency at the middle temporal cortex: Preserved motion information and the effect of perceptual learning

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Abstract Motion opponency, first observed within the primate middle temporal cortex (MT), refers to the suppressing effect of opposite motion directions on neuronal activity. Namely, when opposing motion directional signals stimulate an MT neuron's receptive field, this neuron's response is comparable with that induced by flicker noise. Under such suppression, it is unknown whether any directional information is still represented at MT. In this study, we applied support vector machine (SVM) learning to human functional magnetic resonance imaging data to investigate if any motion defined orientation information was still available from suppressed MT. We found that, at least at the level of ±45° discrimination, such orientation information was still available. Interestingly, after behavioural perceptual learning that improved human discrimination of fine orientation discrimination (e.g. 42° vs. 48°) using the MT‐suppressive motion stimuli, the SVM discrimination of ±45° worsened when functional magnetic resonance imaging (fMRI) signals at post‐learning MT were used. This result is consistent with findings in Thompson et al. (2013) that, post‐perceptual learning, MT suppression was not released, suggesting that motion opponency was perhaps functionally too important for perceptual learning to overcome.

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《The European journal of neuroscience.》 |2022年第12期|6215-6226|共12页
作者
Alexander Yu; Ruizhe Zhang; Andrew E. SilvaYang XingBenjamin ThompsonZili Liu;
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作者单位

Department of Computer Science,University of California, Los Angeles;

Department of Psychology,University of California, Los Angeles;

School of Optometry and Vision Science,University of Waterloo;

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正文语种英语
中图分类神经病学与精神病学;
关键词
motion; MT; opponency; perceptual learning; support vector machine; suppression; V1;

Motion opponency at the middle temporal cortex: Preserved motion information and the effect of perceptual learning

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