Conditioned suppression under positive, negative, and no contingency between conditioned and unconditioned stimuli1

Interactions between conditioned and unconditioned flavor preferences.

Five experiments investigated how rats' conditioned preferences or aversions for aqueous odors paired with sucrose or salt are affected by their unconditioned response to those tastes. Rats preferred an odor paired with 30% sucrose over an odor paired with 5% sucrose when both were presented in 5% sucrose, but they showed no preference or, if thirsty, showed the reverse preference, when the odo...

The effect of satiation upon conditioned and unconditioned salivary responses.

There is no doubt that the conditioned food saiivary reflexes are influenced by the intensity of hunger. However, there is no agreement as to whether this influence is direct or mediated by motor behavior. The data are also conflicting concerning the effect of hunger or satiation upon the unconditioned salivary response. Thus, Finch (1938) found that hunger affects the conditioned and unconditi...

Stimulus modality effects on transformations of conditioned enhancement and conditioned suppression in rats.

Unconditioned and conditioned effects of house-light offset and acoustic white noise on barpressing behavior maintained by intermittent food reinforcement were tested in male hooded rats. Presentations of these stimuli prior to their acquiring signal value initially tended to depress and then to enhance barpressing rate, but generally the rate of the on-going barpressing was lower during the li...

Transfer of conditioned suppression and conditioned acceleration from instrumental to consummatory baselines

Following training on a variable-interval food reinforcement schedule, rats were exposed to Pavlovian procedures which produced reliable conditioned suppression and conditioned acceleration of the leverpressing (instrumental) baseline. When free food was simultaneously made available in the test cage, all subjects spent the majority of each session "freeloading," that is, eating food from a dis...

Rats’ location during conditioned suppression training