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This study was a further attempt to mediate the divergent evidences presented about the theme in terms of some experimental variables. 3 x 2 two-factorial design was used in conditioning with variations in CS-US sequence and levels of training. The rats trained thus differently were tested in the identical situation similar to Mowrer and Aiken's (1954) experiment. The distinctive features in test procedure were : (a) making the situation relatively " dangerous " (b) using partial reinforcement. The covariance analysis of the test scores indicated that the remarkable variance relating to the factor of CS-US sequence could be referred solely to the difference between Forward and the others, and the differential effects of conditioning level upon Control and Backward seem to be not conclusive.

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