Lateral interactions across space reveal links between processing streams for luminance-modulated and contrast-modulated stimuli

Mohd `Izzuddin Hairol, Sarah J. Waugh

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Foveal detection thresholds for luminance-modulated (LM) and contrast-modulated (CM) blobs in the presence of fixed modulation, laterally placed noise blobs (separations of 0-6°) were measured in four observers with normal vision. Detection thresholds measured for LM blobs placed between highly visible LM flankers (1. 1. 1) and for CM blobs placed between highly visible CM flankers (2. 2. 2) produces a similar pattern of lateral interaction effects, i.e. masking where the stimuli overlap and facilitation for separations of 4-8× blob sd units. The region of facilitation is not matched by shallow psychometric function slopes. Detection thresholds measured for LM blobs placed between highly visible CM flankers (2. 1. 2) are generally facilitatory but relatively raised for separations of 0.5-2°. For CM blobs placed between highly visible LM flankers (1. 2. 1), facilitation is stronger in the 0.5-2° region. A significant correlation between thresholds and psychometric function slopes is found only for the 2. 1. 2 condition. We propose a model with two separate but interacting processing streams for the detection of LM and CM targets that may engage different cortical loci.

Original languageEnglish
Pages (from-to)889-903
Number of pages15
JournalVision Research
Volume50
Issue number9
DOIs
Publication statusPublished - Apr 2010
Externally publishedYes

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Psychometrics
Noise

Keywords

  • Contrast-modulated
  • Lateral interactions
  • Luminance-modulated
  • Uncertainty reduction

ASJC Scopus subject areas

  • Ophthalmology
  • Sensory Systems

Cite this

Lateral interactions across space reveal links between processing streams for luminance-modulated and contrast-modulated stimuli. / Hairol, Mohd `Izzuddin; Waugh, Sarah J.

In: Vision Research, Vol. 50, No. 9, 04.2010, p. 889-903.

Research output: Contribution to journalArticle

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