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Optic flow parsing in the macaque monkey.

Nicole E Peltier^1,2, Dora E Angelaki^3,4, Gregory C DeAngelis^1,5

¹Department of Brain and Cognitive Sciences, Center for Visual Science, University of Rochester, Rochester, NY, USA.

Journal of Vision

|October 5, 2020

Summary

This summary is machine-generated.

Monkeys can perceive an object's true direction during self-motion by subtracting optic flow, similar to humans. This study establishes a foundation for exploring the neural basis of this visual processing mechanism.

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Area of Science:

Neuroscience
Visual Perception
Computational Neuroscience

Background:

During self-motion, retinal motion is a sum of object motion and self-motion-induced optic flow.
Flow parsing is a hypothesized mechanism to compute world-relative object motion by subtracting optic flow.
Psychophysical evidence suggests humans use flow parsing, but neural mechanisms remain unclear.

Purpose of the Study:

To investigate whether macaque monkeys exhibit perceptual hallmarks of flow parsing.
To establish a framework for examining the neural basis of flow parsing.

Main Methods:

Trained macaque monkeys to discriminate object direction amidst optic flow simulating self-motion.
Analyzed perceptual biases in object direction discrimination.
Investigated the influence of optic flow magnitude, object position, self-motion velocity, object depth, and vestibular signals on flow-parsing biases.

Main Results:

Monkeys demonstrated perceptual biases consistent with flow parsing, similar to humans.
Biases generally correlated with the magnitude of the optic flow vector at the object's location.
Vestibular self-motion signals enhanced flow parsing, increasing direction perception biases.

Conclusions:

Macaque monkeys exhibit perceptual characteristics of flow parsing.
These findings provide a basis for future research into the neural mechanisms of flow parsing.