Metacontrast masking suggests interaction between visual pathways with different spatial and temporal properties

Ayako Ishikawa, Satoshi Shimegi, Hiromichi Sato

Research output: Contribution to journalArticlepeer-review

30 Citations (Scopus)

Abstract

We examined the spatiotemporal characteristics of metacontrast using sinusoidal grating stimuli as the target and mask for quantitative comparison with the functional properties of the visual cortex. The magnitude of metacontrast effects depended on the stimulus features such as the orientation and spatial frequency of the target and mask. The characteristics of metacontrast dynamically changed depending on the stimulus onset asynchrony (SOA). At short SOAs (0 to ∼40 ms), metacontrast exhibited a high stimulus feature specificity and a low contrast sensitivity, whereas at long SOAs (∼40 to 80 ms), metacontrast exhibited a low stimulus feature specificity and a high contrast sensitivity. We suggest that metacontrast is explained by the interaction between two parallel visual pathways: one with a low contrast sensitivity and a high feature specificity, and the other with a high contrast sensitivity and a low feature specificity.

Original languageEnglish
Pages (from-to)2130-2138
Number of pages9
JournalVision Research
Volume46
Issue number13
DOIs
Publication statusPublished - 2006 Jun
Externally publishedYes

Keywords

  • Contextual modulation
  • Parallel pathways
  • Sinusoidal grating
  • Stimulus specificity
  • Visual masking

ASJC Scopus subject areas

  • Ophthalmology
  • Sensory Systems

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