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Increment and decrement detection on temporally modulated fields

Demarco, P J ; Hughes, A ; Purkiss, T J

Vision research, 2000, Vol.40(14), pp.1907-19 [Peer Reviewed Journal]

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  • Title:
    Increment and decrement detection on temporally modulated fields
  • Author: Demarco, P J ; Hughes, A ; Purkiss, T J
  • Subjects: Perceptual Masking -- Physiology ; Visual Pathways -- Physiology
  • Is Part Of: Vision research, 2000, Vol.40(14), pp.1907-19
  • Description: Increment and decrement probe thresholds were measured during the presentation of two types of temporal masking stimuli. In Experiment 1, we measured thresholds for increment or decrement rectangular probes presented during the presentation of an increment or decrement Gaussian masking stimulus. We find that thresholds are higher when the probe and the Gaussian mask are of the same sign (e. g. both increments). However, both types of Gaussian mask raised increment and decrement probe thresholds above steady state conditions. In Experiment 2, we presented increment or decrement probes at one of eight possible phases of a 1 Hz luminance-modulated sine wave. For both increment and decrement probes, threshold variation with phase is non-sinusoidal in shape, but increment and decrement probe thresholds vary as a function of the sinusoid phase. These experiments show that increment and decrement thresholds vary as a function of the adaptation state of the visual system, and as a function of the...
  • Language: English
  • Identifier: ISSN: 0042-6989 ; PMID: 10837834 Version:1

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