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Simple behaviors were those in which a sensory event provoked an automatic motor response . It was never my impression , except in rare cases , that the mechanisms by which demand characteristics affect subjects ' behavior were those of willful or conscious compliance , though it would appear that I have not been sufficiently explicit about this point . The core phenomena of behavior were those of learning and memory , and the methods of choice for the analysis of leaning and memory involved purely objective observations of behavioral data varying as a function of the experimental manipulation of stimulus conditions ( Woodworth , 1938 ) . Simple behaviors were those in which a given sensory event gave rise deterministically to an appropriate motor response . Complex behaviors were those in which the relationships between stimulus and response were less predictable , involving in the process what Descartes described as the " soul " - later referred to by scientists as cognition or volition . Complex behaviors were those in which the relationship between stimulus and response was unpredictable .