Steering Transforms the Cortical Representation of Self-Movement from Direction to Destination.

Area of Science:

• Neuroscience
• Computational Neuroscience
• Visual Neuroscience

Background:

• Steering behavior relies on processing optic flow cues to maintain heading and reach destinations.
• The dorsal medial superior temporal area (MSTd) is implicated in processing visual motion and spatial information for navigation.

Purpose of the Study:

• To investigate how dorsal medial superior temporal area (MSTd) neuronal responses adapt to different stages of a naturalistic steering task.
• To understand the role of optic flow cues (global radial pattern, local direction, spatial location) in MSTd activity during steering.

Main Methods:

• Monkeys were trained in a simulated naturalistic steering paradigm.
• Dorsal medial superior temporal area (MSTd) cortical neuronal activity was recorded during the steering task.
• Analysis focused on how MSTd responses related to optic flow cues and task demands.

Main Results:

• MSTd responses to initial heading were dominated by global radial optic flow patterns.
• Responses to heading deviations shifted to be dominated by local motion direction cues.
• As monkeys steered back to the goal, MSTd responses became dominated by the spatial location of the flow field's center.

Conclusions:

• MSTd neuronal responses are not fixed but dynamically transformed by task relevance.
• Visual processing in MSTd is reweighted based on the stage of the steering task, integrating bottom-up motion and top-down spatial signals.
• This flexibility allows for adaptive neural computation supporting learned, naturalistic behaviors.