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Stream-specific feedback inputs to the primate primary visual cortex
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DOI：10.1038/s41467-020-20505-5.png)
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摘要
En 中文
The sensory neocortex consists of hierarchically-organized areas reciprocally connected via feedforward and feedback circuits. Feedforward connections shape the receptive field properties of neurons in higher areas within parallel streams specialized in processing specific stimulus attributes. Feedback connections have been implicated in top-down modulations, such as attention, prediction and sensory context. However, their computational role remains unknown, partly because we lack knowledge about rules of feedback connectivity to constrain models of feedback function. For example, it is unknown whether feedback connections maintain stream-specific segregation, or integrate information across parallel streams. Using viral-mediated labeling of feedback connections arising from specific cytochrome-oxidase stripes of macaque visual area V2, here we show that feedback to the primary visual cortex (V1) is organized into parallel streams resembling the reciprocal feedforward pathways. This suggests that functionally-specialized V2 feedback channels modulate V1 responses to specific stimulus attributes, an organizational principle potentially extending to feedback pathways in other sensory systems. In the primate cortex, visual images are processed by multiple hierarchically-organized areas reciprocally connected via feedforward and feedback circuits. Here the authors show that feedback circuits are organized into segregated parallel streams that resemble feedforward pathways.
Keyword:
CYTOCHROME-OXIDASE STRIPES
CLASSICAL RECEPTIVE-FIELD
MACAQUE STRIATE CORTEX
AREAS V1
FUNCTIONAL-ORGANIZATION
PROJECTION STREAMS
NEURAL MECHANISMS
V2
COLOR
CONNECTIONS
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IF:
15.7
论文数:
9.4W
被引数:
91.2W
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