Disruption of drug-dependent learning (memory retrieval) using an ethanol drug state: a replication.

Eight groups (n = 8 per group) of rats were trained to escape foot shock by turning in the correct direction in a T-maze and 24 h after reaching criterion all groups were tested with no foot shock. The four experimental groups were given alternating drug and nondrug test days while the four control groups always experienced the same drug state in training and in testing. Two experimental groups (transfer) heard a 1 kHz tone that was simultaneously paired with foot shock during training, and the tone continued to be sounded on all test trials. These two groups responded significantly (P less than 0.05) above random level with low response latencies on all days of testing, regardless of drug state. The other two experimental groups (DDL) did not receive the tone, and these groups demonstrated dissociated performance. The present study, using 2400 mg/kg ethanol, replicated the DDL and memory retrieval results of our previous chlordiazepoxide studies.