While knowing what to expect is important, it is equally important to know when to expect it and to respond accordingly. This is apparent even in simple Pavlovian training situations in which animals learn to respond more strongly closer to reward delivery. Here we report that the nucleus accumbens core, an area well-positioned to represent…

Summarizes research projects on infant behavior conducted during the 1960's and includes an extensive list of references. (AJ)

The purpose of this article is to focus on the consequences of conditioned response and conditioned response on trial i for response probability on trial i + 1. (Author)

Results of this study indicated that attitude conditioning increased with age and that the increase appeared to be a function of contingency awareness and perhaps also a function of the older subjects' having greater facility in transferring symbolic meaning. (Author)

This paper reviews several issues regarding one- versus two-factor theories of learning. First, the traditional distinctions between classical and operant conditioning are presented. This includes both theoretical and experimental contrasts. Second, empirical evidence in support for a one-factor theory is examined. Numerous research studies…

There has been considerable interest lately in cases where instrumental conditionability appears to depend on the reinforcer used. Here the effects of Pavlovian conditioned stimuli (CSs)on golden hamster behaviors was observed. The intent was to see whether previously reported differences among the behaviors produced by food reinforcement and…

In three experiments, it was demonstrated that human newborn heart rate level can be reliably modified through classical conditioning procedures. Findings support the idea that early learning may occur under a variety of conditions and different theories may account for the results. (Author/SB)

The Babkin reflex is a reaction to the simultaneous pressing of the palms of the hands of the infant. (Authors)

Three experiments carried out second-order Pavlovian conditioning using either similar or dissimilar first-and second-order stimuli. All three experiments were designed to identify the effects of similarity upon conditioning as distinct from its effects upon sensitization or stimulus generalization. (Editor/RK)

The influence of aversive conditions on interpersonal attraction was investigated using 60 female undergraduates as subjects. Dyads were formed and equally divided into aversive (loud-noise) and neutral (low-noise) conditions. After completing an attitude survey questionnaire subjects completed a short filler task while the experimenter…

Probably as a result of America's "socialization" process, girls and women have tended to develop rather negativistic views of females. That this negativism may be part of a developmental indoctrination process is further advanced by the present experiment's finding that older girls in this experiment demonstrated significantly less favorable…