Understanding the contribution of target repetition and target expectation to the emergence of the prevalence effect in visual search |
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Authors: | Hayward J. Godwin Tamaryn Menneer Charlotte A. Riggs Dominic Taunton Kyle R. Cave Nick Donnel |
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Affiliation: | 1.University of Southampton,Southampton,UK;2.School of Psychology,University of Southampton,Southampton,UK |
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Abstract: | Behavior in visual search tasks is influenced by the proportion of trials on which a target is presented (the target prevalence). Previous research has shown that when target prevalence is low (2 % prevalence), participants tend to miss targets, as compared with higher prevalence levels (e.g., 50 % prevalence). There is an ongoing debate regarding the relative contributions of target repetition and the expectation that a target will occur in the emergence of prevalence effects. In order to disentangle these two factors, we went beyond previous studies by directly manipulating participants’ expectations regarding how likely a target was to appear on a given trial. This we achieved without using cues or feedback. Our results indicated that both target repetition and target expectation contribute to the emergence of the prevalence effect. |
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