Download Animal Memory by Werner K. Honig and P. H. R. James (Eds.) PDF

By Werner K. Honig and P. H. R. James (Eds.)

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Unfortunately, we were unable to obtain any clear-cut evidence. Our studies used goldfish in an avoidance shuttle tank in an experimental paradigm patterned after French's. The fish were trained to a moderate criterion in a shuttle tank and then extinguished 1 day, 4 weeks, or 8 weeks after acquisition. The 4-week and 8-week retention intervals were spent in a tank at either 25-26°C (the training and test temperature) or 33° C. To avoid any possible disruption of consolidation processes, the "hot groups" remained at the lower temperatures for 2 days before transfer to the warmer temperature; to avoid complications with readaptation they were brought back to the training temperature 2 days before test.

We should emphasize that interference theory can account for the slowing down of the forgetting rate by chlorpromazine, darkness, or for that matter cold temperatures, on the hypothesis that all of these minimize learning (and thus later interference) during the retention interval. This hypothesis is difficult to establish, and equally difficult to disconfirm. , heat, light) speeds up learning during the retention interval, but also that the learned patterns which 1. FORGETTING OF LONG-TERM MEMORIES IN ANIMALS 39 are acquired during this interval interfere with the habit the retention of which is being tested.

S 3 - (minus-plus shift). The two groups were further split up into two subgroups each matched by trials to criterion on the second discrimination. Groups PM-1 and MP-1 were tested 1 day after reaching criterion; Groups PM-32 and MP-32 were tested 32 days later. The retention test consisted of one further session on the second discrimination. The three stimuli were a triangle (T), vertical stripes (V), and horizontal stripes (H). The first discrimination was always between Τ and either Η or V; the second always between Η and V.

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