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A Source for Feature-Based Attention in the Prefrontal Cortex
Narcisse P Bichot1, Matthew T Heard1, Ellen M DeGennaro1
1Department of Brain and Cognitive Sciences, McGovern Institute for Brain Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
Neuron
|November 4, 2015
Summary
The ventral prearcuate (VPA) region helps locate objects using feature attention. VPA neurons guide eye movements by identifying target object locations for action.
Area of Science:
- Neuroscience
- Cognitive Neuroscience
- Primate Neurophysiology
Background:
- Feature-based attention aids object detection in cluttered environments.
- The ventral prearcuate (VPA) region's role in attention is not fully understood.
Purpose of the Study:
- To investigate how the ventral prearcuate (VPA) region of the prefrontal cortex contributes to feature-based attention and object selection.
- To elucidate the neural mechanisms underlying the guidance of eye movements towards cued targets.
Main Methods:
- A visual search task was employed with non-human primates.
- Electrophysiological recordings were conducted in the VPA, frontal eye fields (FEF), and inferotemporal (IT) cortex.
- VPA inactivation was performed to assess its causal role.
Main Results:
- VPA neurons exhibited selective responses to search cues and maintained feature selectivity.
- VPA cells discriminated targets earlier than FEF or IT cortex neurons.
- VPA inactivation impaired target detection, while FEF retained spatial attention effects.
Conclusions:
- VPA neurons are crucial for computing object locations based on sought features.
- The VPA sends this information to the FEF to guide visually-guided eye movements.
- This study clarifies the VPA's role in the feature-based attention network.
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