Elsevier

Vision Research

Volume 40, Issue 19, September 2000, Pages 2579-2588
Vision Research

Interactions between flicker thresholds and luminance pedestals

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Abstract

We investigated the interactions between flicker thresholds and luminance pedestals using threshold versus contrast (TvC) and method of constant stimuli paradigms. High amplitude luminance pedestals were found to elevate flicker thresholds, but low amplitude luminance pedestals were unable to reduce flicker thresholds. Luminance pedestals elevated flicker thresholds more at low temporal frequencies. A simple model based on local light adaptation was able to capture the general form of the TvC functions. Our results suggest that flicker thresholds derived in the presence of a luminance pedestal (luminance-pedestal flicker) may vary from those obtained by modulating about a mean luminance (mean-modulated flicker).

Keywords

Contrast discrimination functions
Light adaptation
Luminance pedestal flicker
Masking
Facilitation

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