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History Effects on Perception of Noisy Stimuli

Gekas, Nikos; Mamassian, Pascal


Pascal Mamassian


Human perception is partially affected by what has been previously experienced. These history effects presumably help tackle current sensory uncertainty by tracking past stimulus statistics. However, there is no definitive framework on how stimulus history affects perception at different levels of uncertainty. We asked observers to discriminate the orientation of ambiguous Gabor patches at high or low contrast, while we dynamically changed the orientation statistics of unambiguous high-contrast stimuli. We found both repulsive and attractive history effects at different timescales and differences between high- and low-contrast test patches. We present a computational model that can account for these different history effects by tracking both the volatility of past stimulus statistics and the observer’s uncertainty on the current stimulus. This model may help resolve some conflicting results of history effects in the literature.

Presentation Conference Type Conference Abstract
Conference Name 41st European Conference on Visual Perception (ECVP)
Online Publication Date May 2, 2019
Publication Date 2019-04
Deposit Date Dec 8, 2021
Journal Perception
Print ISSN 0301-0066
Electronic ISSN 1468-4233
Publisher SAGE Publications
Peer Reviewed Peer Reviewed
Volume 48
Issue 1_suppl
Pages 1-233
Public URL