The performances of 3 groups of human Ss in a classical eyelid conditioning situation were compared at an interstimulus interval (ISI) of 2.497 sec. 1 group received all training at an ISI of 2.497, a 2nd group received prior training at an ISI of .63 and was switched to one of 2.497, while the 3rd group began training at .63 and was gradually changed to one of 2.497 in 6 steps. The frequency of response was greater in the gradually shifted group than in the other 2 groups. It was concluded (a) that whether or not high response frequencies were obtained at long ISIs depends upon the specific training regimen; (b) that a time discrimination, in the form of response latency, played an important role in the results; and (c) that asymptotic performance at one ISI is not independent of experience with other ISIs.

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