A comparative analysis of serial ordering in ring-tailed lemurs (Lemur catta)

Research over the last 25 years has demonstrated that animals are able to organize sequences in memory and retrieve ordered sequences without language. Qualitative differences have been found between the serial organization of behavior in pigeons and monkeys. Here the authors test serial ordering abilities in ring-tailed lemurs, a strepsirrhine primate whose ancestral lineage diverged from that of monkeys, apes, and humans approximately 63 million years ago. Lemurs' accuracy and response times were similar to monkeys, thus suggesting that they may share mechanisms for serial organization that dates to a common primate ancestor.     

Making Sense of Sense-Making: Reflections on Enactive and Extended Mind Theories

This paper explores some of the differences between the enactive approach in cognitive science and the extended mind thesis. We review the key enactive concepts of autonomy and sense-making. We then focus on the following issues: (1) the debate between internalism and externalism about cognitive processes; (2) the relation between cognition and emotion; (3) the status of the body; and (4) the difference between ‘incorporation’ and mere ‘extension’ in the body-mind-environment relation.

Self-esteem moderates the response to forgiveness instructions among women with a history of victimization

The present study examined whether self-esteem would moderate women’s affect after being exposed to brief instructional interventions tapping into two dimensions of forgiveness: an interpersonal dimension focusing on forgiving the offender, and an intrapersonal dimension focusing on letting go of one’s negative affect toward the offender. The positive and negative affect of 79 women with a history of victimization was assessed after they listened to instructions for either granting forgiveness, letting go of their negative affect, or relaxation (control). Results indicated differential effects of the instructions on emotions directed toward themselves versus toward the offender. Women had more negative emotions about themselves when they received the granting forgiveness instructions, but they had greater positive emotions toward their offenders. Women’s responses were moderated by self-esteem in that there was no differential effect of the instructions among women low in self-esteem, but women high in self-esteem had a relatively positive response to the letting-go instructions and a generally negative reaction to the traditional forgiveness instructions.     

Diversity-Based Reasoning in Children

One of the hallmarks of inductive reasoning by adults is the diversity effect, namely that people draw stronger inferences from a diverse set of evidence than from a more homogenous set of evidence. However, past developmental work has not found consistent diversity effects with children age 9 and younger. We report robust sensitivity to diversity in children as young as 5, using everyday stimuli such as pictures of objects with people. Experiment 1 showed the basic diversity effect in 5- to 9-year-olds. Experiment 2 showed that, like adults, children restrict their use of diversity information when making inferences about remote categories. Experiment 3 used other stimulus sets to overcome an alternate explanation in terms of sample size rather than diversity effects. Finally, Experiment 4 showed that children more readily draw on diversity when reasoning about objects and their relations with people than when reasoning about objects' internal, hidden properties, thus partially explaining the negative findings of previous work. Relations to cross-cultural work and models of induction are discussed.     

Herbert Blumer's critique of The Polish Peasant: A post mortem on the life history approach in sociology

Herbert Blumer's appraisal of William Thomas and Florian Znaniecki's Polish Peasant study and the panel discussion of Blumer's critique, sponsored by the Social Science Research Council in 1938, occasioned a discussion of the value of personal documents in social research which is indicative of the controversy surrounding their use in the interwar period. It is suggested that most sociologists writing in the 1930s were skeptical of the value of personal document research, because such research could not be conducted along the lines of experimental procedure in physical science. Personal document research was in decline by 1938. The critique and conference constituted a post mortem examination of this approach to social analysis.     

Outcome additivity, elemental processing and blocking in human causality judgements

Informing participants in a causal judgement task that outcomes are additive can increase blocking effects (Experiment 1). Outcome additivity information emphasizes the fact that the outcome following a compound is the sum of the effects of its elements. We suggest that the effect of providing outcome additivity information is to encourage elemental processing and thereby enhance blocking. Experiment 2 showed that blocking could be enhanced by factors encouraging elemental processing, and Experiment 3 demonstrated that blocking was reduced by manipulating the visual presentation of cues to encourage configural processing. While these experiments do not rule out the role of inference in causal judgement tasks, the results are most parsimoniously explained by associative accounts that allow flexibility in the encoding of compound cues.     

Psychometric properties of the Wolpe-Lazarus assertiveness scale with community-dwelling older adults

The psychometric properties of the Wolpe-Lazarus Assertiveness Scale (WLAS) were examined with an older community-dwelling, nonclinical, adult population. Three hundred twenty-seven older adults (ages, 57–96; mean, 75.68) who were not psychiatrically impaired completed a demographic questionnaire and the WLAS. Fifty-seven of the 327 subjects also filled out the WLAS on a repeated basis after 3 or 4 weeks in order to determine the test-retest reliability. Results indicate that the WLAS has an adequate internal consistency (Cronbach's=.75) and test-retest reliability (r=.81). WLAS cutoff scores of 14 and under identify unassertiveness. Older adults who are (1) African-American or (2) of lower SES tend to be significantly less assertive. Also, five factors emerged from a principal-components analysis accounting for 34.7% of the total variance.This research is based on the senior author's doctoral dissertation in partial fulfillment of the Ph.D. under the direction of the second, third, and fourth authors.     

A mathematical theory of optical illusions and figural aftereffects

If it is assumed that spurious enhancement of receptive field excitations near the intersection of image lines on the retina contributes to the cortical determination of the geometry of two-dimensional figures, an equation based on the least-squares fit of data points to a straight line-can be obtained to represent theapparent line. Such a fit serves as anextreemum on the precision with which a data set can be represented by a straight line. The disparity between theapparent line and the actual line that occurs in the case of peripheral (and to a lesser degree in more central regions of the retina) vision is sufficient to produce the perceptual errors that occur in the Poggendorff, Hering, and Mueller-Lyer illusions. The magnitude of the Poggendorff illusion as a function of the line angle is derived and experimentally tested. Blakemore, Carpenter, and Georgeson’s (1970) experimental data on angle perception are shown to fit this same function. Theapparent curve is derived for the Hering illusion. The Mueller-Lyer illusion is found to be a variation of the Poggendorff illusion. The equations are further developed and used to derive Pollack’s (1958) experimental results on figural aftereffects. The results involve onlyone experimentally determined coefficient that can be evaluated, within the limits of experimental error, in terms of physiological data. The use of these concepts provides a foundation for the abstract modeling of the initial phases of the central nervous system data reduction processes, including receptive field structure, that is consistent with the physiological limitations of the retina as a source of visual data, as well as with the findings of Hubel and Wiesel (1962).     

The relation between gap discrimination and auditory stream segregation

Gap discrimination and stream segregation were examined using sequences of 2, 4, 8, or 16 tones. The frequency differences between tones ranged from 1/24 to 2 1/2 octaves. Judgments of stream segregation show large intersubject variability, whereas gap thresholds are comparatively stable. Gap thresholds and streaming judgments are both affected by the frequency separation between tones. However, only streaming judgments are affected by presentation rate. Gap-threshold functions show no discontinuities or plateaus with increasing frequency differences and faster presentation rates. These results suggest that stream segregation is not a primary factor limiting gap-discrimination performance in tonal sequences.     

Daily Occupations,Routines, and Social Participation of Homeless Young People

Homelessness disrupts young people’s participation in the productive occupations that facilitate transition to adulthood, impairs social connections, and has a disorganizing effect on their time use. Semi-structured focus group interviews were used to explore how 19 homeless young people perceived their daily routines, meaningful occupations, and social participation to be impacted by the experience of homelessness. Occupational therapy practitioners can use the findings from this study to inform the development of comprehensive community-based programming aimed at increasing social opportunities, developing balanced, healthy routines, decreasing intrinsic and extrinsic barriers to residential stability, and promoting participation in productive and leisure occupations.