Demonstrating the temporal modulation transfer function

A 120-frame movie, which can be downloaded from specified web sites, allows an observer to see the qualitative form of his or her temporal modulation transfer function. Results collected from two of the authors are presented.     

INTERLOCUTION,PERCEPTION, AND MEMORY

Philosophical Studies -     

Community-Based Interventions: A Return to Community Mental Health Centers' Origins

Consultation services offered by community mental health centers (CMHC) have gone through several significant changes since the signing of the Community Mental Health Center Act of 1963 (The President's Commission on Mental Health, 1978). Initially, consultation and education services were an integral part of the CMHC mission. With the passage of additional legislation that promoted a shift in focus, consultation services declined. By 1981, with the passage of the Omnibus Budget Reconciliation Act (Cutler, 1992) national mental health policy was adrift. Consultation and education were no longer seen as central components of mental health services, which increasingly were tied to acute care hospitalization. With a renewed focus on consultation and education, a coherent mental health policy can be reintroduced at the community level.     

Response selection,sensitivity, and taste-test performance

Tasters selected the odd stimulus from among sets of three samples of party dip. Two samples came from one batch, and one sample came from another batch. The physicochemical difference between the batches consisted of the presence or absence of added salt. Two different tests of discriminability were undertaken by the same subjects with the same stimuli: the triangle test and the three-alternative forced-choice (3-AFC) method. Although different numbers of correct selections were obtained in the two tasks, an index of discriminability,d’, had the same value when the data were analyzed in accordance with the Thurstone-Ura and signal-detection models, respectively. The average data support Frijters’s (1979b) contention that different models of the discrimination process are appropriate to the results of the triangular and the 3-AFC procedures. Further analysis of the data revealed that discrimination was poorer for trios containing one physicochemically weak stimulus and two stronger stimuli than it was for trios containing one stronger stimulus and two weak stimuli. A two-signal 3-AFC task was undertaken by some subjects, andd’ estimates from this task were lower than expected on the basis of performance in the other tasks.     

Automatic semantic priming with various category relations in Alzheimer's disease and normal aging.

The 6 experiments reported here tested the effects of various category relations on automatic semantic priming in 20 Alzheimer's disease (AD), 20 older control, and 22 younger control subjects. The tasks were either word pronunciation or lexical decision; the prime-target stimulus-onset asynchrony (SOA) was always 250 ms. A variety of category relationships between prime and target were examined: highly associated category comembers, subordinate-superordinate or superordinate-subordinate pairs, and pairs selected on the basis of category typically to form typical-typical, atypical-typical, typical-atypical, and atypical-atypical pairings. Both for AD versus older control subjects and for older versus younger control subjects, no significant group differences were found in the magnitude of overall semantic priming or in the effects on priming of factors pertaining to the prime-target relationship.     

Effect of stimulus duration on stereo and vernier displacement thresholds

Stereo and vernier thresholds were determined as a function of stimulus duration in both misalignment and displacement paradigms. All four thresholds increase as stimulus duration decreases. The increase is greatest for the stereo displacement threshold, less for the vernier displacement threshold, and least for the misalignment thresholds. The results are consistent with the hypothesis that depth signals are averaged over time.     

Support for Gun Control: the Influence of Personal,Sociotropic, and Ideological Concerns1

Two random telephone surveys were conducted-one in Evanston, Illinois and one in Morton Grove, Illinois-to assess the motivations underlying public support for handgun control. The data from both surveys suggested that such support was linked most strongly to citizen beliefs about the effect of a handgun ban on the overall crime rate. Little support was found for either the suggestion that gun control opposition is linked to concerns about personal protection against crime or for the suggestion that views about gun control are part of a more general ideological orientation.     

DIVERGENT PROBLEM SOLVING

On compare les performances d'adolescents hindous (N = 70) et américains (N = 94) habitant des bourgs agricoles, dans deux épreuves de créativité (divergent thinking). Les résultats montrent que les sujets américains donnent plus de réponses nouvelles aux problèmes, tandis que les Hindous répondent de façon routinière, ce qui ne convient pas aux tâches proposées. On peut interpréter ces différences de deux manières: ou bien c'est l'environnement pris globalement qui entraîne une capacité différentielle à penser de façon créatrice; ou bien il s'agit d'une influence spécifique de la maison et de l'école. Une réplique partielle de la première étude a été réalisée à New Delhi (Inde): le milieu urbain présente des ressemblances avec l'environnement global des adolescents américains, tout en conservant les traditions hindoues en matière d'habitat et d'école. Les résultats sont en faveur de l'hypothèse selon laquelle ce sont les différences dans l'environnement global qui influent sur la créativité.     

A solid-state device for eliminating electrical noise and biopotentials in electromyographic (EMG) recordings

A small, low-cost, integrated circuit device is described. This circuit reduces electrical noise, such as that produced from a poor electrode-skin interface and power-line interference (60 Hz). Advantages of this device, with regard to use in electrically noisy environments and with long cables, are discussed.