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Updated: Nov 2, 2025
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Investigating Object Representations in the Macaque Dorsal Visual Stream Using Single-unit Recordings
Published on: August 1, 2018
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Working memory gates visual input to primate prefrontal neurons.
Behrad Noudoost1, Kelsey Lynne Clark1, Tirin Moore2
1Department of Ophthalmology and Visual Sciences, University of Utah, Salt Lake City, United States.
Elife
|June 16, 2021
Summary
Working memory (WM) directly gates visual input to the prefrontal cortex, influencing visually guided behavior. This gating mechanism targets visuomotor neurons, enhancing sensory processing when visual and memory information align.
Area of Science:
- Neuroscience
- Cognitive Neuroscience
- Systems Neuroscience
Background:
- Visually guided behavior integrates sensory input with working memory (WM).
- Neural circuit mechanisms underlying this integration remain poorly understood.
- Prefrontal cortex plays a crucial role in visuomotor control and WM.
Purpose of the Study:
- To investigate how direct visual cortical inputs to prefrontal cortex are modulated by WM.
- To identify the specific neuronal populations within the prefrontal cortex that receive these visual inputs.
- To elucidate the impact of WM content on the processing of visual information in visuomotor circuits.
Main Methods:
- Electrophysiological recordings in behaving monkeys performing a visuomotor task.
- Analysis of direct visual cortical inputs to prefrontal cortex neurons.
- Manipulation of visual stimuli and WM content to assess their interaction.
Main Results:
- The efficacy of visual input to prefrontal cortex is gated by information held in WM.
- Visual inputs target visuomotor neurons, not exclusively visual neurons.
- Evoked activity from visual cortex is enhanced (larger, more synchronous, faster) when visual input matches remembered locations.
Conclusions:
- Working memory actively modulates sensory processing in visuomotor circuits.
- Prefrontal cortex circuitry integrates visual information with WM content to guide behavior.
- This study reveals a direct neural mechanism by which WM influences sensory-driven motor output.
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