Concurrent variation of response bias and sensitivity in an operant-psychophysical test |
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Authors: | Michael Terman Jiuan S Terman |
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Institution: | 1. Department of Psychology, Northeastern University, 440 United Building, 02115, Boston, Massachusetts
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Abstract: | The yes-no signal detection procedure was applied to a single-response operant paradigm in which rats discriminated between a standard auditory intensity and attenuated comparison values. The payoff matrix was symmetrical (with reinforcing brain stimulation for correct detections and brief time-out for errors), but signal probability and intensity differences were varied to generate a family of isobias and isosensitivity functions. The d’ parameter remained fairly constant across a wide range of bias levels. Isobias functions deviated from a strict matching strategy as discrimination difficulty increased, although an orderly relation was maintained between signal probability value and the degree and direction of response bias. |
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