Aversive conditioning in the sociopath

Results of two experiments on differential conditioning of the skin conductance (SCR) in sociopaths and normal control subjects are described. In the first experiment it was found that an equal number of sociopaths and control subjects were aware of the conditioning contingency. However, only the normal subjects displayed reliable differential SCR conditioning. Sociopaths showed a dissociation between verbal learning and conditioning of a physiological change. The second experiment examined the differential conditioning of normal subjects and sociopaths in partial remission. The number of aware subjects in the two groups did not differ. Aware subjects in both groups showed differential SCR conditioning. Differential conditioning in sociopaths did not persist over trials as it did in control subjects. A deficiency in ACTH 4–10 as well as neurological dysfunctions were considered possible factors in the etiology of sociopathy. Further research on the relation of neuropeptides to the etiology and treatment of sociopathy is suggested.     

Conditioned suppression in goldfish as a function of shock-reinforcement schedule

The conditioned suppression technique (Estes and Skinner, 1941) was employed to study the effects of partial-shock reinforcement in the goldfish. Lever-pressing behavior of hungry goldfish was suppressed in the presence of a flashing light that had been previously paired with electric shocks. Fish that acquired the suppression under 50% and 100% shock-reinforcement, respectively, were subjected to repeated presentations of the flashing light alone. This procedure revealed a more rapid extinction of the suppressed behavior in the 50% than in the 100% shocked group. The finding was compared with those from other experiments and possible reasons for the differences were examined.     

Met expectations: The effects of expected and delivered inducements on employee satisfaction

Interpretation of existing theory and research on met expectations is problematic due to ambiguous conceptualization of the met expectations hypothesis and limitations imposed by the measurement strategies typically employed in this domain (i.e. difference scores and direct retrospective measures). In this longitudinal study, we sought to overcome these problems by using an alternative methodology to conduct a more comprehensive test of the met expectations hypothesis based on Warr's (1987) Vitamin Model and on research in related fields (e.g. person–environment fit). Polynomial regression and response surface analyses were used to examine how employee satisfaction is related to unmet, met, and exceeded expectations concerning two distinct types of inducements analogous to vitamins A (skill development opportunities) and E (support, compensation). Respondents included 342 limited term employees. Consistent with previous research, our results indicated that unmet expectations of any sort were associated with decreased satisfaction. However, contrary to common interpretations of the extant literature, our results also indicated that met expectations were not always associated with high levels of satisfaction and that exceeded expectations were, in the case of skill development, negatively associated with satisfaction. These findings suggest a need to broaden existing met expectations theory and to refine common organizational practices.     

Beyond Heritability: Twin Studies in Behavioral Research

ABSTRACT— The heritability of human behavioral traits is now well established, due in large measure to classical twin studies. We see little need for further studies of the heritability of individual traits in behavioral science, but the twin study is far from having outlived its usefulness. The existence of pervasive familial influences on behavior means that selection bias is always a concern in any study of the causal effects of environmental circumstances. Twin samples continue to provide new opportunities to identify causal effects with appropriate genetic and shared environmental controls. We discuss environmental studies of discordant twin pairs and twin studies of genetic and environmental transactions in this context.     

Cuba, Castro and Anti-Semitism

The Soviets provided Cuba with the model of attacking human rights activities and organizations as a necessary extension of the Jewish Zionist conspiracy. The identification of Castro with forces dedicated to the destruction of Israel was made plain in proclamation and practice. The Cuban position is that the war on terrorism is actually an example of “Liberation Imperialism.” Cubans make no reference to the repeated assaults on Israel, or the actual causes of the Middle East conflict—the denial of the right of Israel to exist as a Nation-State in that region. Anti-Semitism is so powerfully rooted as a cultural element in authoritarian cultures that even when, as in the case of Cuban communism, it entails the tortured twisting of doctrinal elements within Marxism–Leninism, such as doctrinal claims about the “materialist foundations of society,” its leaders will sacrifice the ideology to the reality. Part of the Castro attachment to communism is an overall contempt for the Jewish mini-Diaspora within the larger flight of Cubans to the United States and other places where the practice of free speech remain unimpeded. The regime of Fidel Castro has changed little in the past 49 years, compared to the rest of the world.     

Effects of varying stimulus size on object recognition in pigeons

The authors investigated the pigeon's ability to generalize object discrimination performance to smaller and larger versions of trained objects. In Experiment 1, they taught pigeons with line drawings of multipart objects and later tested the birds with both larger and smaller drawings. The pigeons exhibited significant generalization to new sizes, although they did show systematic performance decrements as the new size deviated from the original. In Experiment 2, the authors tested both linear and exponential size changes of computer-rendered basic shapes to determine which size transformation produced equivalent performance for size increases and decreases. Performance was more consistent with logarithmic than with linear scaling of size. This finding was supported in Experiment 3. Overall, the experiments suggest that the pigeon encodes size as a feature of objects and that the representation of size is most likely logarithmic.     

Is pigmentation important for face recognition? Evidence from contrast negation

It is extraordinarily difficult to recognize a face in an image with negated contrast, as in a photographic negative. The variation among faces can be partitioned into two general sources: (a) shape and (b) surface reflectance, here termed 'pigmentation'. To determine whether negation differentially affects the processing of shape or pigmentation, we made two sets of faces where the individual faces differed only in shape in one set and only in pigmentation in the other. Surprisingly, matching performance was significantly impaired by contrast negation only when the faces varied in pigmentation. This provides evidence that the perception of pigmentation, not shape, is selectively disrupted by negation and, by extension, that pigmentation contributes to the neural representation of face identity.     

Gender influences on preschool children's social problem-solving strategies

The authors investigated gender influences on the nature and competency of preschool children's social problem-solving strategies. Preschool-age children (N = 179; 91 boys, 88 girls) responded to hypothetical social situations designed to assess their social problem-solving skills in the areas of provocation, peer group entry, and sharing or taking turns. Results indicated that, overall, girls' responses were more competent (i.e., reflective of successful functioning with peers) than those of boys, and girls' strategies were less likely to involve retaliation or verbal or physical aggression. The competency of the children's responses also varied with the gender of the target child. Findings are discussed in terms of the influence of gender-related social experiences on the types of strategies and behaviors that may be viewed as competent for boys and girls of preschool age.