Not just standing there: the use of postural coordination to aid visual tasks

Postural control is an integral part of all physical behavior. Recent research has indicated that postural control functions in a manner that facilitates other higher order (suprapostural) tasks. These studies, while showing that postural sway is modulated in a task specific manner, have not examined the form of postural coordination that allows for the achievement of these higher behavioral goals. The current study examined the relation between visual task constraints (viewing distance), environmental constraints (changes in the surface of support), and the postural coordination employed to complete the task. Thirty-one participants were asked to perform a reading task while standing on various surfaces. Postural motion was recorded from the head, cervico-thoracic spine, sacrum (hip), and ankle. It was found that body segment coordination changed as a function of surface characteristics and task constraints. Additionally, the overall pattern of postural sway (head motion) replicated that which was found by Stoffregen et al. [J. Exp. Psychol. Human Percep. Perform. 25 (6) (1999) 1641]. These findings suggest that postural adaptation involves more than basic reduction or increase of motion; it involves the functional coordination of body segments to achieve a particular goal. The data further suggest that there is a need to examine postural control in the absence of external perturbations.     

Temporal specificity of perceptual learning in an auditory discrimination task

Although temporal processing is used in a wide range of sensory and motor tasks, there is little evidence as to whether a single centralized clock or a distributed system underlies timing in the range of tens to hundreds of milliseconds. We investigated this question by studying whether learning on an auditory interval discrimination task generalizes across stimulus types, intervals, and frequencies. The degree to which improvements in timing carry over to different stimulus features constrains the neural mechanisms underlying timing. Human subjects trained on a 100- or 200-msec interval discrimination task showed an improvement in temporal resolution. This learning generalized to a perceptually distinct duration stimulus, as well as to the trained interval presented with tones at untrained spectral frequencies. The improvement in performance did not generalize to untrained intervals. To determine if spectral generalization was dependent on the importance of frequency information in the task, subjects were simultaneously trained on two different intervals identified by frequency. As a whole, our results indicate that the brain uses circuits that are dedicated to specific time spans, and that each circuit processes stimuli across nontemporal stimulus features. The patterns of generalization additionally indicate that temporal learning does not rely on changes in early, subcortical processing, because the nontemporal features are encoded by different channels at early stages.     

Recombinative generalization of within-syllable units in nonreading adults with mental retardation

Two adults with mental retardation demonstrated the recombination of within-syllable units (onsets and rimes) using a spoken-to-printed-word matching-to-sample (MTS) procedure. Further testing with 1 participant showed comprehension of the printed words. Printed-word naming was minimal before, but greater after, comprehension tests. The findings suggest that these procedures hold promise for further basic and applied analyses of word-attack skills.     

Neuropsychopharmacologic treatment of depression and other neuropsychiatric disorders in HIV-infected individuals

How can neuropsychiatric disorders and syndromes be underdiagnosed and inadequately treated in individuals infected with human immunodeficiency virus? Depression in particular is among the most prevalent diagnoses and there is a solid foundation of data from controlled clinical studies that has begun to examine the efficacy of various antidepressants in HIV-infected persons. This article summarizes essential findings pertaining to the use of psychotropic medications to treat depression and other neuropsychiatric disorders in the context of immunodeficiency. This includes discussion of clinically significant treatment considerations (eg, efficacy, side effects, drug-drug interactions) derived from the existing literature. Taken together, there is compelling evidence that psychopharmacologic intervention can improve the quality of life of mentally ill HIV-infected individuals.     

Reminiscence Functions Across Adulthood: A Replication and Extension

Reminiscence, a naturally occurring process of recalling personally experienced events from our past, has been investigated primarily from a clinical, gerontological perspective. A total of 268 participants (100 male, 168 female) ranging in age from 17 to 88 years (M age = 40.02, SD = 20.32) completed the Reminiscence Functions Scale (RFS), the Memorial University of Newfoundland Scale of Happiness (MUNSH), and a single-item question assessing the perceived importance of shared family memories. Results indicated neither age nor gender differences on the total RFS score, indicating that men and women of all ages reminisce equally frequently. However, there were gender and age differences on specific dimensions of reminiscence. Specifically, women scored higher on the RFS factor of Identity (Idn) and lower on Bitterness Revival (BiR). Younger adults tended to score higher on the RFS factors of Boredom Reduction (BoR), BiR, Problem-Solving (PS), and Idn compared to older adults. In contrast, older adults tended to score higher on the RFS factors of Teach/Inform (T/I) and Death Preparation (DP). BoR, BiR, and PS correlated negatively with happiness, whereas Conversation (C) and T/I correlated positively with happiness. Finally, T/I, Intimacy Maintenance (IM), Idn, and C all correlated positively with the measure of the perceived importance of shared family memories. The results replicate earlier work with the RFS and suggest that examining reminiscence from a contextual, lifespan perspective is an important research area.     

Learning To Parse?

A strong claim about human sentence comprehension is that the processing mechanism is fully innate and applies differently to different languages only to the extent that their grammars differ. If so, there is hope for an explanatory project which attributes all parsing strategies to fundamental design characteristics of the parsing device. However, the whole explanatory program is in peril because of the discovery (Cuetos & Mitchell, 1988) that Late Closure is not universal: Spanish, and also Dutch and other languages, favor Early Closure (high attachment) where English favors Late Closure flow attachment). I argue that the universal parser can weather this storm. Exceptions to Late Closure in Spanish and other languages are observed only in one construction (a relative clause attaching into a complex noun phrase [NP]), which is borderline in English too. For other constructions, low attachment is preferred in all languages tested. I propose that what differentiates the complex NP construction is the heaviness of the attachee compared to that of the host configuration. A relative clause is a heavy attachee, and the lower NP alone is small as a host; the relative is therefore better balanced if the whole complex NP is its host. A wide range of facts is accounted for by the principle that a constituent likes to have a sister of its own size. Light constituents will tend to attach low, and heavy ones to attach high, since larger constituents are dominated by higher nodes. A preference for balanced weight is familiar from work on prosodic phrasing. I suggest, therefore, that prosodic processing occurs in parallel with syntactic processing (even in reading) and influences structural ambiguity resolution. Height of attachment ambiguities are resolved by the prosodically motivated same-size-sister constraint. The exceptional behavior of English may be due to its prosodic packaging of a relative pronoun with the adjacent noun, overriding the balance tendency. If this explanation is correct, it is possible that all cross-language variations in parsing preferences are due to cross-language variations in the prosodic component of the competence grammar.     

Effects of trait and situational self-handicapping on competitive anxiety among athletes

Initial evidence suggests that the employment of self-handicapping strategies has a beneficial effect on negative affective states associated with the perceived threat of evaluative contexts (Harris & Snyder, 1986; Leary, 1986). The present study sought to describe the type of self-handicapping behaviors demonstrated by youth athletes (N=238) as well as to assess the stress-buffering role of athlete self-handicapping on indices of competitive state anxiety. Specifically, it was hypothesized that among high trait-handicapping athletes, those who report a greater degree of performance-debilitating obstacles prior to competition would demonstrate lowered cognitive and somatic state anxiety as well as greater state self-confidence than nonhandicapping athletes. However, MANOVA results indicated that both high trait and situational self-handicappers demonstrate elevated state anxiety immediately prior to competition. Results are discussed in relation to the possible role of state anxiety as a salient self-handicapping strategy within competitive sport.     

The Multidimensional Assessment of Career Decision Problems: The Career Decision Diagnostic Assessment

The multidimensional assessment of career decision problems as measured by the Career Decision Diagnostic Assessment (CDDA; Bansberg & Sklare, 1986) is described, and the CDDA is evaluated for reliability, validity, and factor structure with a sample of 844 students from three universities. Results supported the reliability and validity of the CDDA as a measure of psychological blocks to career decision making. Preliminary normative scores for university students are presented. Recommendations for improving the CDDA and for using the CDDA in career counseling are discussed.     

Neuropsychological changes in children with cancer: The treatment of missing data in longitudinal studies

Researchers conducting longitudinal studies with children or adults are inevitably confronted with problems of attrition and missing data. Missing data in longitudinal studies is frequently handled by excluding from analyses those cases for whom data are incomplete. This approach to missing data is not optimal. On the one hand, if data are missing at random, then dropping incomplete cases ignores information collected on those cases that could be used to improve estimates of population parameters (e.g., means, variances, covariances, and growth rates) and improve the power of significance tests of statistical hypotheses. On the other hand, if data are not missing at random, then dropping incomplete cases leads to biased parameter estimates and hypothesis tests that may be internally and externally invalid. This study uses three years of follow-up data from a longitudinal investigation of neuropsychological outcomes of cancer in children to demonstrate the problems presented by missing data in repeated measures designs and some solutions. In evaluating potential biasing effects of attrition, the study extends previous research on neuropsychological outcomes in pediatric cancer by inclusion of patients whose disease had relapsed, and by comparison of surviving and nonsurviving patients. Although the data presented have specific relevance to the study of neuropsychological outcome in pediatric cancer, the problems of missing data and the solutions presented are relevant to a wide variety of diseases and conditions of interest to researchers in child and adult neuropsychology.     

Affirmation of the High-Power Person and His Position: Ingratiation in Conflict

Eighty college students were induced to be bargainers who had high power in that they controlled more valued resources than the other bargainer. The low-power bargainer (a confederate) expressed different types of affirmations (positive evaluations) of the participants. The low-power bargainer either strongly or mildly affirmed the personal effectiveness of the participants and either strongly or mildly affirmed their negotiating position. Participants whose personal effectiveness was strongly, compared to mildly, affirmed increased their self-evaluation and were attracted to the low-power person. They did not, however, agree to the low-power person's demand. Participants whose position was strongly, as opposed to mildly, affirmed did not increase their self-evaluation nor were they more positive toward the low-power person. They did reject the low-power person's demand. Results were interpreted as suggesting that strong affirmations of personal effectiveness and of position may be ineffective ingratiation strategies in conflict.