Relative judgments affect assessments of stimulus duration |
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Authors: | Mikaël Molet Thomas R Zentall |
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Institution: | (1) Reed College, Department of Psychology, Portland, OR 97202, USA;(2) University of Canterbury, Department of Psychology,, Christchurch, New Zealand |
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Abstract: | Humans were trained on two independent temporal discriminations, with correct choice dependent on the initial stimulus duration.
In Experiment 1, the durations were 1.0 and 4.0 sec, with one set of choice stimuli, and 2.0 and 8.0 sec, with a different
set of choice stimuli. The 2.0- and 4.0-sec values were selected to be the geometric mean of the two values in the other discrimination.
In Experiment 2, the durations were 2.0 and 5.0 sec for one discrimination and 3.5 and 6.5 sec for the other. The 3.5- and
5.0-sec values were selected to be the arithmetic mean of the two values in the other discrimination. In both experiments,
participants showed evidence for relational coding of the duration pairs. That is, the test durations were selected to be
at the presumed bisection point (i.e., they should have produced indifferent choice), but instead the shorter test duration
from the longer duration pair produced a “short” bias (in both experiments), whereas the longer duration from the shorter
duration pair produced a “long” bias (in the second experiment). Results were similar to those from Zentall, Weaver, and Clement
(2004) with pigeons. |
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Keywords: | |
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