Abstract-concept learning in Black-billed magpies (<Emphasis Type="Italic">Pica hudsonia</Emphasis>)

Abstract relational concepts depend upon relationships between stimuli (e.g., same vs. different) and transcend features of the training stimuli. Recent evidence shows that learning abstract concepts is shared across a variety species including birds. Our recent work with a highly-skilled food-storing bird, Clark’s nutcracker, revealed superior same/different abstract-concept learning compared to rhesus monkeys, capuchin monkeys, and pigeons. Here we test a more social, but less reliant on food-storing, corvid species, the Black-billed magpie (Pica hudsonia). We used the same procedures and training exemplars (eight pairs of the same rule, and 56 pairs of the different rule) as were used to test the other species. Magpies (n = 10) showed a level of abstract-concept learning that was equivalent to nutcrackers and greater than the primates and pigeons tested with these same exemplars. These findings suggest that superior initial abstract-concept learning abilities may be shared across corvids generally, rather than confined to those strongly reliant on spatial memory.     

A projective assessment of autonomous motivation in children: Correlational and experimental evidence

This article presents two studies aimed at validating a new TAT-like projective measure of autonomous motivation in children. Study 1 assesses the validity of the new measure by correlating it with self-report questionnaires of autonomous motivation, positive and negative affect, task value and mastery goal orientation. Study 2 is an experiment in which autonomous motivation is manipulated and then assessed with the new projective measure and with a self-report scale. Results of both studies support the validity of the new projective measure. In study 2, regression analysis suggests that the new projective measure is sensitive to aspects of experimentally induced autonomous motivation that are not captured by a self-report measure.

Catecholamines in predatory behavior: A review and critique

A variety of strategies have been employed in assessing the role of catecholamines (CA) in predatory behavior; the results of these various approaches are reviewed. While it remains difficult to ascribe a single biologically significant role to CA at this time, this may at least in part reflect measurement considerations, problems in the widely varying experimental models, pharmacologic side effects, and failures to categorically distinguish the differing contributions of individual CA systems in the control of predation. The potential role of such factors in determining the outcome of an experiment are reviewed and possible functional contributions of CA systems are suggested.     

Bioethical issues in biostatistical consulting: development of a survey

To develop a survey, the Bioethical Issues in Biostatistical Consulting Questionnaire, for investigating bioethical issues in analysis, a comprehensive literature review was conducted to specify areas of bioethics. Through a focus group study and the evaluation by 10 biostatisticians, the questionnaire was constructed. Validation must involve a panel of experts. Now, test-retest reliability and factor analysis should be conducted on a group of eligible subjects.     

Generalization hypothesis of abstract-concept learning: learning strategies and related issues in Macaca mulatta, Cebus apella, and Columba livia

The generalization hypothesis of abstract-concept learning was tested with a meta-analysis of rhesus monkeys (Macaca mulatta), capuchin monkeys (Cebus apella), and pigeons (Columba livia) learning a same/different (S/D) task with expanding training sets. The generalization hypothesis states that as the number of training items increases, generalization from the training pairs will increase and could explain the subjects' accurate novel-stimulus transfer. By contrast, concept learning is learning the relationship between each pair of items; with more training items subjects learn more exemplars of the rule and transfer better. Having to learn the stimulus pairs (the generalization hypothesis) would require more training as the set size increases, whereas learning the concept might require less training because subjects would be learning an abstract rule. The results strongly support concept or rule learning despite severely relaxing the generalization-hypothesis parameters. Thus, generalization was not a factor in the transfer from these experiments, adding to the evidence that these subjects were learning the S/D abstract concept.     

An experimental analysis of the extinction-induced response burst

The occurrence, time course, and repeatability of response rate increases following the onset of extinction, the extinction burst, were studied in three experiments. Nine pigeons were exposed to at least 5 cycles of 5-session blocks of conditioning followed by 8-session blocks of extinction. In different experiments, conditioning sessions either were a fixed-ratio (FR) or variable-ratio (VR) schedule, and transitions from the last conditioning session in each cycle to the first extinction session were conducted between or within sessions. A single response rate increase occurred when overall response rates were considered. Restricting analyses to the first minute of extinction sessions sometimes revealed increases in response rates, although this finding was inconsistent. The frequency and magnitude of these increases differed across exposures to extinction both across and within pigeons. Additionally, how responding during extinction was measured (i.e., the level of analysis) influenced whether increases above baseline levels were observed. These results suggest that the extinction burst may be influenced by the manner of transition to extinction and the way in which early extinction responding is measured. Under the best conditions, the extinction burst does not appear to be a ubiquitous effect of extinction.     

Women’s Sexual Compliance with Male Dating Partners: Associations with Investment in Ideal Womanhood and Romantic Well-Being

Sexual compliance involves willing acquiescence to unwanted sex for the good of the relationship. Northeastern U.S. undergraduate women in exclusive relationships (N?=?193) anonymously reported on their sexual behaviors and motives, investment in ideal womanhood, and romantic well-being. About 37% (n?=?72) reported sexual compliance. As expected, sexually compliant women reported greater investment in ideal womanhood than non-compliant women, although unexpectedly, they reported less overall satisfaction and similar commitment. Women’s compliance was motivated more by pursuing relationship enhancement than by avoiding conflict. Regardless, only avoidance motives were associated (negatively) with relationship satisfaction. Compliant women who reported more frequent compliance motivated by conflict avoidance reported particularly low satisfaction. These findings challenge conceptualizations of women’s sexual compliance as beneficial.