Function of center-surround antagonism for motion in visual area MT/V5: a modeling study

Area of Science:

• Neuroscience
• Computational Neuroscience
• Primate Vision

Background:

• Cortical area MT (V5) in primates contains neurons with a receptive field surround.
• This surround region is hypothesized to be involved in motion segmentation and shape-from-motion processing.

Purpose of the Study:

• To investigate the functional role of the receptive field surround in primate MT/V5 neurons.
• To determine if the surround region contributes to both motion segmentation and shape-from-motion processing.

Main Methods:

• Modeling electrophysiological data from macaque studies.
• Developing a novel stimulus paradigm to probe surround function.
• Analyzing model neuron responses to different visual stimuli.

Main Results:

• Demonstrated a functional dichotomy in the surround region's processing.
• Model neurons selectively code for object edges when present.
• Model neurons code for first-order shape in the absence of clear edges.
• Showed that small neural populations can linearly encode orientation-in-depth for translating planes.

Conclusions:

• The receptive field surround of MT/V5 neurons plays distinct roles in visual processing.
• The surround is crucial for differentiating objects via motion segmentation and inferring shape.
• These findings advance our understanding of visual information processing in the primate brain.