Evidence affects hypothesis judgments more if accumulated gradually than if presented instantaneously |
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Authors: | Jennifer C Whitman Todd S Woodward |
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Institution: | (1) Department of Psychiatry, University of British Columbia, Vancouver, BC, Canada;(2) BC Mental Health and Addictions Research Institute, Vancouver, BC, Canada;(3) Room A3-A116, BC Mental Health & Addictions Research Institute – Translational Research Building, 3rd Floor, 938,W. 28th Avenue, Vancouver, British Columbia, V5Z 4H4, Canada; |
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Abstract: | In a hypothesis comparison task involving quantifiable evidence, we investigated whether judgments of relative probability
were affected by gradual evidence accumulation and by making a series of revised ratings, rather than a single final one.
Each trial of our task required participants to rate the probability that a focal hypothesis, rather than its alternative,
was correct. We manipulated (1) the strength of evidence supporting the focal hypothesis, (2) the strength of evidence supporting
its alternative, and (3) whether that evidence was presented in three sequential portions (gradually accumulated evidence
condition) or, instead, was all presented instantaneously (control condition). In a second experiment, we also manipulated
(4) the number of successive ratings made within a trial with gradually accumulated evidence. Regardless of how many ratings
were made per trial, gradual evidence accumulation increased the effects of evidence strength on ratings of relative probability. |
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