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Related Experiment Videos

Object-based attention in the primary visual cortex of the macaque monkey

P R Roelfsema1, V A Lamme, H Spekreijse

  • 1Graduate School Neurosciences Amsterdam, Department of Visual System Analysis, Academic Medical Center, The Netherlands. p.roelfsema@ioi.knaw.nl

Nature
|October 6, 1998
PubMed
Summary
This summary is machine-generated.

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Object-based attention enhances neural responses in the primary visual cortex (V1). This study shows attention boosts neuronal activity for selected objects, even when they cross distractors, at the earliest visual processing stage.

Area of Science:

  • Neuroscience
  • Visual Perception
  • Cognitive Neuroscience

Background:

  • Natural scenes require object segregation from background.
  • Visual processing theories propose pre-attentive and attentive systems.
  • Pre-attentive system handles rapid, parallel segregation; attentive system is recruited for complex scenes.

Purpose of the Study:

  • To investigate if attentive selection modulates neuronal firing rates in the primary visual cortex (V1).
  • To determine if object-based attention enhances neural responses at the earliest cortical processing level.

Main Methods:

  • Monkeys were trained on a curve-tracing task.
  • Neuronal responses in V1 were recorded.
  • Responses to target and distractor curves were compared, including when curves intersected.

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Main Results:

  • Neuronal responses to segments of a target curve were simultaneously enhanced.
  • This enhancement occurred relative to responses evoked by a distractor curve.
  • Response enhancement was observed even when the target and distractor curves crossed.

Conclusions:

  • Object-based attention is associated with response enhancement in V1.
  • This enhancement occurs at the earliest level of the visual cortical processing hierarchy.
  • Findings support the role of V1 in attentional modulation for object segregation.