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Related Concept Videos

Color Vision01:24

Color Vision

Color perception begins in the retina, the light-sensitive layer at the back of the eye. Two main theories explain how colors are seen: the trichromatic theory and the opponent-process theory. The trichromatic theory, proposed by Thomas Young in 1802 and extended by Hermann von Helmholtz in 1852, suggests that color vision is based on three types of cone receptors in the retina. These cones are sensitive to different but overlapping ranges of wavelengths corresponding to red, blue, and green.

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N1pc reversal following repeated eccentric visual stimulation.

Mahesh Casiraghi1, Ulysse Fortier-Gauthier, Paola Sessa

  • 1Department of Developmental Psychology, University of Padova, Padova, Italy.

Psychophysiology
|January 16, 2013
PubMed
Summary
This summary is machine-generated.

Early visual processing shows an event-related potential (ERP) asymmetry called N1pc. This study found that reduced neural reactivity, not reference frame remapping, explains N1pc reversal patterns.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Visual Perception

Background:

  • Early event-related potential (ERP) hemispheric asymmetries, specifically the N1pc, are typically observed at occipitoparietal sites.
  • The N1pc reflects larger N1 amplitude over the posterior contralateral hemisphere following a lateral peripheral stimulus onset.
  • A reversed N1pc (larger N1 over the ipsilateral hemisphere) occurs with subsequent central or bilaterally balanced stimuli.

Purpose of the Study:

  • To investigate the underlying mechanisms of reversed N1pc.
  • To differentiate between the reference frame-remapping account and the reduced neural reactivity account for N1pc reversal.
  • To test predictions derived from these competing accounts through experimental manipulation.

Main Methods:

  • Three experiments were conducted.
  • The spatial location of an object relative to a preceding sudden onset was systematically varied.
  • ERP recordings were used to measure N1pc amplitudes and analyze hemispheric asymmetries.

Main Results:

  • The experimental results supported the reduced neural reactivity account.
  • The findings were inconsistent with the predictions of the reference frame-remapping account.
  • Observed N1pc patterns aligned with explanations of diminished neural responsiveness after a peripheral stimulus onset.

Conclusions:

  • The study concludes that reduced neural reactivity, rather than a shift in visual spatial reference frames, best explains the observed N1pc reversal.
  • These findings challenge the prevailing interpretation of N1pc reversal as evidence for attentional remapping.
  • The results suggest a simpler neural mechanism underlying early visual processing asymmetries.