The effects of dot density and motion coherence on perceptual fading of a target in noise

Spatial Vision
A E Welchman, J M Harris

Abstract

A peripherally presented target embedded in dynamic texture perceptually disappears (or 'fills-in') after around 10 s of steady fixation. This phenomenon was investigated for a target containing moving dots. The effects of manipulating the coherence of the motion within the target and the density of dots across the whole screen were explored. Coherence thresholds for the detection of a target at different dot densities were recorded for comparison. Fading occurred faster as either motion coherence or dot density was reduced. Coherence thresholds for target detection were unaffected by manipulations of dot density. There appeared to be no relationship between the stimulus exposure time needed for fading and the coherence threshold for detection of a target. The results suggest that the time taken for a target to fade is not a simple function of its motion detection threshold.

Citations

May 10, 2008·Consciousness and Cognition·Shih-Yu Lo, Su-Ling Yeh
Jan 1, 2011·Perception·Erika T WellsJohn E Sparrow
Oct 22, 2005·Mental Retardation and Developmental Disabilities Research Reviews·Raye-Ann deRegnier
Jan 31, 2008·Environmental Management·Xiaobo MaAlbert Koenig
Jun 14, 2019·Frontiers in Neuroscience·Qinglin LiGeorgios A Keliris
Apr 11, 2003·Primates; Journal of Primatology·Shumpei UnnoAkichika Mikami

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