Fast Tuning of Posture Control by Visual Feedback Underlies Gaze Stabilization in Walking Drosophila

Overview

Journal Curr Biol

Publisher Cell Press

Specialty Biology

Date 2021 Sep 9

PMID 34499851

Citations 10

Authors

Tomas L Cruz

Sebastian Malagon Perez

M Eugenia Chiappe

Affiliations

Soon will be listed here.

Abstract

Locomotion requires a balance between mechanical stability and movement flexibility to achieve behavioral goals despite noisy neuromuscular systems, but rarely is it considered how this balance is orchestrated. We combined virtual reality tools with quantitative analysis of behavior to examine how Drosophila uses self-generated visual information (reafferent visual feedback) to control gaze during exploratory walking. We found that flies execute distinct motor programs coordinated across the body to maximize gaze stability. However, the presence of inherent variability in leg placement relative to the body jeopardizes fine control of gaze due to posture-stabilizing adjustments that lead to unintended changes in course direction. Surprisingly, whereas visual feedback is dispensable for head-body coordination, we found that self-generated visual signals tune postural reflexes to rapidly prevent turns rather than to promote compensatory rotations, a long-standing idea for visually guided course control. Together, these findings support a model in which visual feedback orchestrates the interplay between posture and gaze stability in a manner that is both goal dependent and motor-context specific.

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