32 rats were given runway training. Total amount of reinforcement (
Rt) for 5 days and total number of reinforced trials (
Nr= 10) were kept constant while the total acquisition trials (
Nt) were varied from 10 to 20. 3 extinction days followed. There are significant differences among groups for extinction but not for acquisition as to reciprocals of running time and total running time except reciprocal latency. A tentative conclusion is, the more
Nt, the slower the extinction. But it may be better to conclude that acquisition and extinction performances depend on
Rf % with changed.
Nt under the equated
Rt and
Nr.
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