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Using a Task-Filled Delay During Discrimination Trials to Examine Different Components of Learned Visual Categorical Perception
The evidence concerning the level at which learned CP
effects occur is complex. The goal of this study was to use
a different approach to this question by manipulating the
abstractness of the information available for distinguishing
pairs of items in an XAB task, and the presence or absence
of a short task-filled delay between X and AB. Participants
engaged in XAB trials containing a mixture of trials with
and without the delay task before and after standard training
to classify visual texture stimuli into two categories.
Training improved discrimination of pairs differing on the
category-relevant dimension whether within- or betweencategory,
but not on pairs differing only on non-category
relevant low level features. In addition, only successful
learners in the post-training trials avoided decreased
discrimination accuracy due to the delay task, suggesting
that they formed more stable representations. However, this
effect was not limited to pairs varying in category-relevant
ways