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Investigating Object Representations in the Macaque Dorsal Visual Stream Using Single-unit Recordings
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Distinct temporal developments of visual motion and position representations for multi-stream visuomotor
Hiroshi Ueda1, Naotoshi Abekawa2, Sho Ito2
1NTT Communication Science Laboratories, Nippon Telegraph and Telephone Co., Kanagawa, Japan. hiroshi.ueda.be@hco.ntt.co.jp.
Scientific Reports
|August 22, 2019
Summary
The brain uses fast visual motion signals for quick reactions and slower position updates for ongoing adjustments. This dual-stream processing in visuomotor control helps us interact with dynamic environments.
Area of Science:
- Neuroscience
- Cognitive Science
- Motor Control
Background:
- The brain's processing of visual information for motor reactions is debated, specifically whether motion or position signals dominate.
- Current theories suggest visually guided actions rely on target position, modulated by motion cues.
Purpose of the Study:
- To investigate the distinct roles of motion and position signals in visuomotor control.
- To differentiate the temporal dynamics of motion and position processing during reaching correction tasks.
Main Methods:
- Manipulating the influence of internal target motion on position representation.
- Analyzing illusory position shifts between targets with soft and hard edges in reaching correction tasks.
Main Results:
- An indirect effect, linked to position representation changes, emerged significantly slower than the initial motor adjustment.
- The findings reveal a temporal dissociation between motion and position signal contributions.
Conclusions:
- Visuomotor control involves parallel processing streams: a rapid, direct motion pathway for action initiation and a slower, updated position pathway for regulation.
- This multi-stream mechanism is vital for effective interaction with dynamic, real-world environments.
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