Blocking and unblocking of conditioned analgesia

Two experiments with rat subjects assessed the blocking phenomenon using inhibition of responding to painful thermal stimulation as an index of conditioned analgesia established through conditioned stimulus (CS)-shock pairings. In Experiment 1, a group of rats receiving the standard blocking procedure ($\text{A+}\text{AB+}$) showed shorter response latencies during a hot plate test of pain sensitivity in the presence of the added CS than groups of rats receiving various blocking control procedures. Experiment 2 replicated the blocking outcome of Experiment 1 and also demonstrated that the addition of a second shock unconditioned stimulus (US) during the compound conditioning phase attenuated the blocking effect; i.e., unblocking was observed. However, the deletion of a second shock US during compound conditioning in a group that had received two shocks on each trial in the first phase of the experiment failed to result in unblocking. These data extend the associative account of conditioned analgesia to situations involving stimulus selection and the implications for the analysis of aversive learning are discussed.     

Searching for a pre-specified target letter in briefly displayed words and unpronounceable non-words

Two experiments were designed in which subjects searched briefly displayed and masked arrays of letters for a single pre-specified target. The target was randomly located at one of twelve positions, its identity remained constant throughout, and it was embedded either in the context of words or in a context of unpronounceable strings of letters. In experiment 1 the letters were arranged in two six-item rows, and word and non-waord displays were mixed and presented to a single group of subjects. Accuracy of search was superior when the letters formed words, both for responses scored for correct position and for responses scored for correct row. In experiment 2 word and non-word displays were presented to different groups of subjects, and for both groups the twelve characters were either arranged as before in two rows or were positioned at loci representing the clock positions. Accuracy of search was again superior when the letters formed words and were arranged in rows, but there was no advantage for words when the letters formed a circle. These findings, firstly, indicated that the “word-superiority effect” obtained in experiment 1 was not a result of subjects adopting a word processing strategy for all stimuli, and secondly, they suggested that the word information could not be used to advantage in the absence of spatial cues delineating the words and/or when the letters were not positioned in the usual horizontal arrangement. It was concluded that the results of both studies were consistent with a perceptual account of the word superiority effect.     

Father identification,achievement, and occupational behavior of rural youth: 10-year follow-up

Males from rural economically deprived school districts, who had previously been surveyed as high school seniors, again 1 year after graduation, and again 5 years after graduation, were surveyed a fourth and final time 10 years after high school graduation concerning their occupational status and aspirations, their marital status, their spouses' educational and occupational achievements, the importance of life roles, and their occupational and personal satisfactions. In the original study the participants had been divided into two groups, low-identification males (LIM) and high-identification males (HIM) based on independent evaluators' judgments of the adequacy of their fathers as identification models. Each group's responses to the survey were compared. The results indicate that there were no statistically significant differences between the two groups on the variables of optimism about the future, spouses' occupational achievements, role importance, occupational satisfaction, and personal satisfaction. There were statistically significant differences on the variables of occupational status, occupational aspirations, educational achievements, educational plans, marital status, and spouses' educational achievements. The results are discussed in the context of the three previous surveys. Over the 10-year period the occupational and educational achievements and aspirations have been significantly higher for the HIM group than for the LIM group. Equally consistent is the finding that over the 10-year period there has been no differences between the two groups in satisfaction with status.     

Aptness in metaphor

We propose that in understanding a metaphor, an individual sees a concept from one class or domain in terms of its similarity in two different respects to a concept from another class or domain. The two kinds of similarity are within-domain similarity, or the degree to which two concepts occupy similar positions with respect to their own class or domain; and between-domain similarity, or the degree to which the classes or domains occupied by the concepts are themselves similar. To test this dual notion of similarity, we obtained ratings of the aptness of 64 metaphors from one group of subjects and ratings of their comprehensibility from another group of subjects. The terms of the metaphors had been scaled (based on the ratings of pretest subjects) to give measures of distance both within and between domains. Aptness of metaphors related positively to betweendomain distance, negatively to within-domain distance, and not at all to overall distance. Metaphors are thus perceived as more apt to the extent that their terms occupy similar positions within domains that are not very similar to each other. Comprehensibility also related to aptness. In a second experiment, subjects ranked a set of terms as possible completions for metaphors. For both groups of subjects in this experiment, the rank of an alternative's within-domain distance correlated with its relative popularity. Quantitative models, patterned after a model proposed by D. Rumelhart and A. A. Abrahamson (Cognitive Psychology, 1973, 5, 1–28) for analogical reasoning, afforded significant prediction of the choices of the group of subjects in which all the possible completions of a metaphor were from a single domain. The same models did not predict the choices of a group of subjects in which the possible completions of the metaphors were from different domains.     

A transitive-chain theory of syllogistic reasoning

A new theory of syllogistic reasoning, called the transitive-chain theory, is presented. The transitive-chain theory proposes that information about set relations is represented in memory by pairs of informational components. The theory further proposes that information about set relations is integrated by applying a small set of rules to transitive chains of these set relations. The rules that are applied to these chains are specified in detail. The theory is cast in terms of information-processing models for variants of the syllogistic reasoning task, and then mathematical models that quantify each of these information-processing models are presented. In a series of five experiments, the transitive-chain theory provides a good account of the response-choice data for syllogisms with various types of content, quantifiers, and logical relations (categorical and conditional). The results of these experiments offer tentative answers to four issues in the theory of syllogistic reasoning: (a) representation of premise information; (b) combination of premise information; (c) sources of difficulty in syllogistic reasoning; and (d) generality of the processes used in syllogistic reasoning.     

Bobo clown aggression in childhood: Environment,not genes

We videotaped 216 twin children (average age: 7.6 years) hitting a 5-ft “Bobo clown”. Three behaviors in the Bobo clown situation showed adequate response characteristics, rater reliability, and test-retest reliability: number of hits, intensity of hits, and number of quadrants (into which the Bobo clown was hit). In terms of two “anchor” variables, height and weight, the twin correlations were representative of other studies in suggesting substantial hereditary influence. However, twin analyses of the three behavioral ratings during the Bobo clown session yielded no evidence of hereditary influence. Moreover, the results provided evidence of substantial environmental influence of the “between-family” variety. In other words, the family environment is the major source of individual differences for these measures.     

Novelty-seeking,novelty-finding,and the developmental continuity of intelligence

This article suggests that novelty-seeking and novelty-finding, as well as the ability to learn and reason with novel kinds of concepts, are critical aspects of intelligence at all ages from infancy, onward. The results of studies by Lewis and Brooks-Gunn and by Fagan and McGrath regarding intelligence in infancy are reviewed, and these results are found to be compatible with some of my own results regarding intelligence in adulthood. It is suggested that a major aspect of intelligence, attitude toward and performance with novel kinds of concepts, is continuous in nature throughout the life span, although by necessity, they must be measured in different ways at different times of life.     

An investigation of various performance-based treatments with acrophobics

Five different performance-based treatments (participant modeling, participant modeling without therapist physical contact, modeling plus exposure, therapist-controlled exposure in vivo and rationale only) were compared to evaluate their relative effectiveness in the treatment of acrophobia. Ten subjects were assigned to each of the five groups. Avoidance behavior was assessed using a behavior test, self-report fear measures, heart-rate and self-efficacy expectation measures. Subjects were first submitted to two behavioral approach tests. These two pre-tests were administered 1 week apart, and no significant differences occurred between the evaluations. Analyses of variance for repeated measures at pre-test. post-test and follow-up revealed a significant improvement on all main outcome measures for the five groups. No significant differences among groups were observed. The total treatment time, which was also used as a dependent measure, did not yield any significant differences among treatment conditions. These findings have many implications. For instance, the need for induction aids, such as physical contact with the therapist and modeling, is questioned. Also, exposure per se whether therapist or self-controlled is shown to be effective in reducing avoidance behavior. Finally, the theoretical and clinical implications of these results are discussed.