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Wei Ji Ma; Probabilistic Reports of Working Memory for Color. Journal of Vision 2016;16(4):27. doi: https://doi.org/10.1167/16.4.22.
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© ARVO (1962-2015); The Authors (2016-present)
Are working memory representations point estimates (e.g. a specific shade of red) or are they richer, consisting of a probability distribution over possible features? In a color memory task, subjects reported on each trial a segment of the color wheel that reflected both their estimate of the memorized color and their uncertainty. The reported uncertainty correlated with estimation error. In blocks in which a non-uniform prior over colors was used, estimates were biased towards the prior mean, and the bias was larger for larger reported uncertainty. Our findings are consistent with a Bayesian framework in which people reason with probabilistic color memories.
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