Abstract
The facilitative effect of unpaired UCS presentations in eyelid conditioning was studied by varying the number of prior paired CS-UCS presentations (associative factor) and the intensity of the UCS (motivational factor). Results showed that, when a strong UCS was used on paired CS-UCS trials, performance following unpaired UCS presentations was significantly poorer than performance of a control group which had received continued CS-UCS pairings. When a weak UCS was used, unpaired UCS presentations led to an increase in CRs but no more than would have been expected following an equal number of prior paired CS-UCS trials. Performance was not related to the intensity of the UCS on unpaired trials. Results are interpreted as leaving the issue unresolved.
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