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Selective disruption of eyeblink classical conditioning by concurrent tapping

A total of 140 normal adults participated in one of seven conditions designed to test the hypothesis that memory systems may be distinguished on the basis of their neurobiological substrates. The results revealed a selective disruption of eyeblink classical conditioning (EBCC) when it was performed concurrently with tapping, another cerebellar task. Subjects simultaneously engaged in EBCC and a recognition task or control tasks were relatively unimpaired in EBCC. Results provide evidence for the existence of neurobiologically distinct memory systems, and suggest that the selective disruption of EBCC, when concurrently performed with tapping, may be attributed to cerebellar involvement in both tasks.