Suppression of monocular visual direction under fused binocular stimulation: Evoked potential measurements

Anthony M. Norcia, Suzanne P. McKee, Yoram Bonneh, Mark W. Pettet

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

Visual evoked potentials (VEPs) were recorded in response to a vernier onset/offset target presented to one eye that was combined with matching static targets in the other eye. The monocular response was dominated by a negative peak at 160 ms that occurred after a set of offsets was introduced into a one-dimensional random bar pattern. The static targets produced no discernible VEP response by themselves, but when fused binocularly with the oscillating vernier target, they produced shifts in perceived visual direction that influenced the VEP response. A vernier target fused with static vertical bars was perceived to alternate in depth between a flat surface and one broken into two interleaved surfaces. The response to this "surface-breaking" was as large or larger than the response to the monocular vernier offset. This response was much reduced when the oscillating vernier was fused with a static offset vernier (5′ offset) that produced a percept of segregated regions moving in depth. Apparently, the VEP is strongly driven by shifts in visual direction that alter surface, texture, or contour contiguity.

Original languageEnglish
Article number4
Pages (from-to)34-44
Number of pages11
JournalJournal of Vision
Volume5
Issue number1
DOIs
StatePublished - 27 Jan 2005
Externally publishedYes

Keywords

  • Binocular interaction
  • Fusion
  • Stereopsis
  • Visual evoked potentials

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