Reaction time signatures of discriminative processes: Differential effects of stimulus similarity and incentive |
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Authors: | Email author" target="_blank">Donald?S?BloughEmail author |
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Institution: | Department of Psychology, Brown University, Providence, Rhode Island 02912, USA. donald_blough@brown.edu |
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Abstract: | In three experiments with pigeons, the similarity of unreinforced test stimuli to a reinforced stimulus and the frequency
of reinforcement associated with a stimulus were varied. The stimulus on each trial was a small spot that appeared in different
hues or, in Experiment 3, different forms. Differential response frequency and reaction time (RT) patterns emerged: Changes
in similarity affected the percentage of stimuli responded to but left the shape of RT distributions about the same, whereas
changes in reinforcement shifted RT distributions but had little effect on the percentage of responses. When the similarity
and reinforcement variables were applied to the same stimuli (Experiment 2), their effects were largely independent. A generalization
procedure (Experiment 3) replicated the similarity effects of the initial discrimination procedure. The RT distributions were
modeled by a diffusion process, and implications for a memory-instance model were suggested. |
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Keywords: | |
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