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Lateral masking effects on contrast sensitivity in rats.

Daniel D Kurylo1, Sowmya Yeturo1, Joseph Lanza1

  • 1Department of Psychology, Brooklyn College CUNY, Brooklyn, NY, 11210, United States.

Behavioural Brain Research
|August 10, 2017
PubMed
Summary

Lateral masks reduce target visibility in rats, indicating minimal role of intrinsic lateral connections in early visual processing. This finding contrasts with species differences in visual cortex organization.

Keywords:
Animal perceptionAnimal psychophysicsCortical integrationLateral flankersVisual cortex

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Area of Science:

  • Neuroscience
  • Visual Perception
  • Comparative Psychology

Background:

  • Stimulus visibility is influenced by adjacent elements, potentially due to lateral interactions in early cortical areas.
  • Rodent visual cortex organization differs from primates and cats, suggesting species-specific functional distinctions.

Purpose of the Study:

  • To investigate the perceptual effects of lateral interactions on contrast sensitivity in rats.
  • To determine the role of intrinsic lateral connections in early visual processing in rodents.

Main Methods:

  • Contrast sensitivity was measured in rats using Gabor patches as targets, masked by additional patches.
  • Perceptual indices were derived from reaction time distributions across varying luminance contrast levels.
  • The influence of mask orientation and separation on target contrast sensitivity was assessed.

Main Results:

  • Contrast sensitivity for targets without masks aligned with previously reported levels.
  • The presence of lateral masks consistently reduced target sensitivity across all contrast levels.
  • No significant effects of mask orientation or separation on contrast sensitivity were observed.

Conclusions:

  • Lateral masking demonstrates interference from adjacent elements, reducing target sensitivity in rats.
  • The lack of orientation or separation effects may relate to the non-systematic cortical topography in rodents.
  • Intrinsic lateral connections in early visual processing areas appear to play a minimal role in stimulus integration for rats.