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Investigating Object Representations in the Macaque Dorsal Visual Stream Using Single-unit Recordings
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Visual Responses in FEF, Unlike V1, Primarily Reflect When the Visual Context Renders a Receptive Field Salient.

Wilsaan M Joiner1,2, James Cavanaugh3, Robert H Wurtz3

  • 1Laboratory of Sensorimotor Research, National Eye Institute, National Institutes of Health, Bethesda, Maryland 20892, and wjoiner2@gmu.edu.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|September 16, 2017
PubMed
Summary
This summary is machine-generated.

Researchers developed a new method to differentiate visual responses from stimulus salience in the brain. They found that salience, not just visual input, significantly drives neural activity in higher visual areas like the frontal eye field (FEF).

Keywords:
FEFV1contextreceptive fieldsaliencevisual response

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Area of Science:

  • Neuroscience
  • Visual Processing
  • Primate Brain Function

Background:

  • Neuronal visual responses are influenced by both visual stimulation and stimulus salience (abrupt appearance).
  • Distinguishing between these two components has been challenging in visual neuroscience.
  • Previous research suggests higher visual areas integrate contextual factors beyond direct visual input.

Purpose of the Study:

  • To introduce a novel method for separating visual responses from salience contributions.
  • To investigate the relative impact of visual stimulation versus salience in the frontal eye field (FEF) and primary visual cortex (V1).
  • To determine the timing of salience representation in the FEF.

Main Methods:

  • Recorded neuronal activity in the FEF (N=51) and V1 (N=15) of male macaques (Macaca mulatta).
  • Presented identical stimuli within and outside the neuronal receptive field (RF).
  • Manipulated stimulus salience by varying inter-stimulus intervals (ISIs) between 500 ms and 16 ms.

Main Results:

  • A decrease in ISI from 500 ms to 16 ms resulted in a ~79% reduction in FEF response, versus a ~17% decrease in V1.
  • The FEF showed reduced salience-driven responses even when preceding stimuli did not activate the RF.
  • Response changes in FEF suggest salience is represented earlier than <100 ms post-stimulus onset.

Conclusions:

  • Salience significantly modulates neural activity in higher visual areas like the FEF.
  • FEF responses are driven more by contextual salience than direct visual stimulation, challenging existing models.
  • Salience plays a dominant role in visual processing at later stages of the visual system.