Engineering topics
Publications and source records attributed to Yarczower, M..
The aversive action of visual stimuli was studied in two groups of pigeons which received response-contingent or noncontingent electric shocks in cages with translucent response keys. Presentation of grain for 3 sec, contingent on key pecking, was the visual stimulus associated with conditioned punishment or suppression. The responses of the pigeons in three different experiments are compared.
The effects of amount of training on conditioned inhibition and on the degree of stimulus control were studied using pigeons. The ability of an S- associated with non-reinforcement of suppress positive reinforced behavior was acquired very rapidly during discriminative training. Increased S+, S- training appeared to weaken this conditioned inhibitory effect while at the same time more S+ training apparently increased the amount of external inhibition (non-conditioned inhibition) of positively reinforced behavior by a novel stimulus. Behavioral contrast and incremental generalization gradients along the S- dimension (inhibitory dimensional control) were absent at all stages of training. Behavioral contrast and inhibitory dimensional control are therefore not necessary concomitants of conditioned inhibition by an S-. A new method of assessing the suppressive effects of stimuli during generalization tests was described.
Stimulus control during conditional discrimination development at various training stages, using two key situation and two visual dimensions
Inhibitive stimulus control related to behavioral contrast during discriminative training
Conditioned suppression after differential training, discussing shock tests on rats with safe and danger signals
Response rates of rats to periodic shocking for food reinforcement with added clock cue stimuli
Periodic shock in rats maintained on variable-interval schedule of reinforcement interspersed with sequence of three different stimulus conditions