Adaptation to Peripheral Flicker

With strict fixation, a flickering disk presented in the peripheral retina rapidly appeared to lose contrast and stop flickering, owing to adaptation. Subjects measured this adaptation by continually adjusting the flicker amplitude of a peripherally viewed disk to hold it just at threshold. (1) The...

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Bibliographic Details
Published inVision research (Oxford) Vol. 36; no. 21; pp. 3479 - 3485
Main Author ANSTIS, STUART
Format Journal Article
LanguageEnglish
Published England 01.11.1996
Subjects
Adaptation, Ocular - physiology
Fixation, Ocular
Flicker Fusion - physiology
Humans
Sensory Thresholds - physiology
Time Factors
Visual Cortex - physiology
Visual Fields
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ISSN0042-6989
DOI10.1016/0042-6989(96)00016-8

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Summary:With strict fixation, a flickering disk presented in the peripheral retina rapidly appeared to lose contrast and stop flickering, owing to adaptation. Subjects measured this adaptation by continually adjusting the flicker amplitude of a peripherally viewed disk to hold it just at threshold. (1) The contrast threshold for flicker increased logarithmically over time. (2) The slope of the temporal decay function increased with eccentricity (1-16 deg) and with decreasing disk size (8 deg-3.6 min arc). (3) M-scaling the stimulus size could abolish the dependence upon eccentricity for small disks, but not completely for large disks. (4) The temporal decay rate increased with flicker rate (3-15 Hz), as though each cycle of flicker elevated contrast threshold equally.
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ISSN:0042-6989
DOI:10.1016/0042-6989(96)00016-8