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Goal-directed attention in late visual processing: On the scope and flexibility of feature-based attention

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Title: Goal-directed attention in late visual processing: On the scope and flexibility of feature-based attention
Author: Dube, Blaire
Department: Department of Psychology
Program: Psychology
Advisor: Al-Aidroos, Naseem
Abstract: Feature-based attention (FBA) has known effects on visual perception; however, its effects on later processing (i.e., visual working memory; VWM) are not well understood. Across three experiments I used a partial-report task to assess effects of FBA on the probability that items were encoded into VWM, and the precision of their representations. To investigate the flexibility of feature-based control I manipulated the likelihood that the feature-based goal would be relevant. Experiments 1 and 2 defined the relevant feature prior to encoding, and, to isolate later functioning, Experiment 3 defined the relevant feature per trial following encoding. Experiments 1 and 2 revealed that FBA affects both VWM probability and resolution, and these effects operate independently and flexibly. Experiment 3 revealed a later, less flexible mechanism for FBA. FBA has multiple effects on VWM that are separately influenced by the value of the goal, and the timing of when it is implemented.
URI: http://hdl.handle.net/10214/9125
Date: 2015-08
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