Decision-level adaptation in motion perception

Mather, George and Sharman, Rebecca (2015) Decision-level adaptation in motion perception. Royal Society Open Science, 2 (150418). ISSN 2054-5703

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Decision-level adaptation in motion perception
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Prolonged exposure to visual stimuli causes a bias in observers’ responses to subsequent stimuli. Such adaptation-induced biases are usually explained in terms of changes in the relative activity of sensory neurons in the visual system which respond selectively to the properties of visual stimuli. However, the bias could also be due to a shift in the observer’s criterion for selecting one response rather than the alternative; adaptation at the decision level of processing rather than the sensory level. We investigated whether adaptation to implied motion is best attributed to sensory-level or decision-level bias. Three experiments sought to isolate decision factors by changing the nature of the participants’ task while keeping the sensory stimulus unchanged. Results showed that adaptation-induced bias in reported stimulus direction only occurred when the participant’s task involved a directional judgement, and disappeared when adaptation was measured using a non-directional task (reporting where motion was present in the display, regardless of its direction). We conclude that adaptation to implied motion is due to decision-level bias, and that a propensity towards such biases may be widespread in sensory decision-making

Keywords:Motion perception, Bias, Motion adaptation, JCOpen
Subjects:C Biological Sciences > C800 Psychology
B Subjects allied to Medicine > B140 Neuroscience
Divisions:College of Social Science > School of Psychology
ID Code:19577
Deposited On:27 Nov 2015 10:00

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