2 experiments concerned adaptation to a water deprivation schedule. Guinea pigs needed about 21 days to adjust to such a schedule, and a green supplement which is necessary for maintaining health does not interfere markedly with water consumption.
Two groups were tested for spontaneous alternation using massed and spaced trials but alternation rate was not above chance level. Two experiments then examined the use of visual stimuli as pacers for an approach response. The results indicate that subjects responded to complexity and that complexity may be a more effective pacer than novelty.
Arterial pulse transit time (PTT) and ECG•initiated transit time (ECG•TT) can be measured noninvasively in human subjects and reflect significant aspects of cardiovascular activity. In eight conditioning trials, with the cold pressor as the unconditioned stimulus, conditioned decreases in PTT and increases in ECG•TT were observed in later trials, concomitant with con• ditioned vasoconstriction. The results are discussed in terms of the potential contribution of PTT and ECG•TT in examining the effects of psychological processes on the cardiovascular system. Classically conditioned cardiovascular responses have been widely investigated in animals (e.g.,
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