Abstract
Experiment I compared trace and delay differential classical eyelid conditioning in adult human Ss at three ISIs (800, 1,100, 1,400 msec). Pure-tone CSs were used, with the trace CS having a duration of 50 msec and the delay CS terminating with the UCS. There was no significant trace deficit at any ISI, which indicates that the recognition or identification response involved in the differential classical conditioning of adult humans is maintained during long trace-stimulus offset to UCS-onset intervals. Experiment II compared trace and delay differential conditioning at 300-, 500-, and 800-msec ISIs. Again there was no trace conditioning deficit. Differential conditioning was significantly poorer at a 500- than at an 800-msec ISI, and no differential conditioning was found with a 300-msec ISI. The level of conditioning of the 300-msec group was much below that of the other groups and that expected for single-cue conditioning at the same ISI.
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References
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This research was supported by PHS Grant HD 05653. The authors thank Joyce B. Reinhardt for her help in collecting the data of Experiment II.
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Ross, S.M., Ross, L.E. & Werden, D. Trace and delay differential classical eyelid conditioning in human adults. Bull. Psychon. Soc. 3, 224–226 (1974). https://doi.org/10.3758/BF03333453
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DOI: https://doi.org/10.3758/BF03333453