Effects of speaking rate and lexical status on phonetic perception.

Among the contextual factors known to play a role in segmental perception are the rate at which the speech was produced and the lexical status of the item, that is, whether it is a meaningful word of the language. In a series of experiments on the word-initial /b/p/ voicing distinction, we investigated the conditions under which these factors operate during speech processing. The results indicated that under instructions of speeded responding, listeners could, on some trials, ignore some later occurring contextual information within the word that specified rate and lexical status. Importantly, however, they could not ignore speaking rate entirely. Although they could base their decision on only the early portion of the word, when doing so they treated the word as if it were physically short—that is to say, as if there were no later occurring information specifying a slower rate. This suggests that listeners always take account of rate when identifying the voicing value of a consonant, but precisely which information within the word is used to specify rate can vary with task demands. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Use of behavioral versus traditional procedures for increasing job interview skills.

A job interview skills workshop model based on behavioral procedures such as modeling, role playing, and directed feedback was compared with the traditional lecture-discussion group approach. 45 college seniors were randomly assigned to a behavioral, discussion, or no-treatment control group. Ss participated in a videotaped, simulated job interview prior to and following each workshop. Results from 1 self-report and 8 behavioral measures indicate that the behavioral group made significant gains in percentage of eye contact maintained during the interview. The discussion group was found to be superior to the behavioral and control groups in ratings of ability to explain individual skills and expression of feelings and personal opinions relevant to the interview. Also the discussion group was found to result in a significant increase in length of speaking. A model of combining the most effective components of the behavioral and discussion groups is presented as offering the most promising approach to job interview skills training. (30 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Smoking abstinence, eating style, and food intake.

Individual differences in weight gain after smoking cessation may reflect differences in eating restraint that exist before cessation. It was hypothesized that abstinent smokers with high scores on the Eating Inventory Disinhibition Scale would be more likely to overeat than nonabstinent smokers with lower Disinhibition Scale scores. Forty smokers completed the Eating Inventory and the Profile of Mood States (POMS). Subjects were randomly assigned to 24-hr cigarette abstinence or to continued smoking. Subjects then participated in an ice cream tasting task, after which they were free to eat as much ice cream as they wanted. The hypothesis was confirmed. Exploratory analyses indicated that eating behavior items predicted the amount eaten and that weight fluctuation items did not. The POMS Confusion Scale scores were highest for abstinent subjects who scored high on the Disinhibition Scale. A parallel but nonsignificant relation was observed for POMS Tension Scale scores. The meaning of these data for the relation between smoking cessation and weight gain is discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Calculations of Stable and Metastable Equilibrium Diagrams of the Ag-Cu and Cd-Zn Systems

Gibbs energies have been modeled for the binary alloy systems Ag-Cu and Cd-Zn, simple eutectic systems of interest in the area of rapid solidification. Parameters of the thermodynamic functions are derived from phase diagram and thermochemical data. Metastable phase equilibria have then been calculated, as well as the chemical spinodals and the locus of compositions and temperatures where liquid and solid have equal Gibbs energies (T ₀).     

WISC-R subtest variability in normal Canadian children and its relationship to sex, age, and IQ.

91 children (mean age 11.5 yrs), screened for absence of emotional and educational disabilities, were tested on the WISC-R and examined for significant subtest variability. Arithmetic, Digit Recall, Comprehension, and Coding differed significantly from the grand mean of all subtests. In a 2nd analysis, subtest variability was examined relative to Ss' sex, age, and overall IQ. Sex differences occurred on Information, Picture Completion, Arithmetic, Coding and Digit Recall. Age differences occurred on Information and marginally on Performance IQ. Sex and Age interacted on Performance IQ, and Sex and IQ interacted on Coding. It is suggested that the absence of sex-specific norms and separate norms for Canadian children may lessen the clinical interpretability of subtest differences on the WISC-R. (French abstract) (29 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Crystal structure and mechanism of GlpT, the glycerol-3-phosphate transporter from E. coli

The major facilitator superfamily represents the largest group of secondary active membrane transporters in prokaryotic and eukaryotic cells. They transport a vast variety of substrates, presumably via similar mechanisms, yet the details of these mechanisms remain unclear. Here we report the 3.3 A resolution structure of a member of this superfamily--GlpT, the glycerol-3-phosphate transporter from the E. coli inner membrane, in the absence of a substrate. The antiporter mediates the exchange of glycerol-3-phosphate for inorganic phosphate across the membrane. Its N- and C-terminal domains exhibit a pseudo 2-fold symmetry along an axis perpendicular to the membrane. Eight of the twelve transmembrane alpha-helices are arranged around a centrally located substrate translocation pore that is closed off at the periplasmic surface. Present at the beginning of the pore are two arginine residues that presumably comprise the substrate-binding site which is accessible only from the cytosol, suggesting an inward-facing conformation for the transporter. The central loop connecting the N- and C-terminal domains is partially disordered and exhibits reduced susceptibility to trypsin in the presence of substrate, indicating conformational changes. We propose that GlpT operates via a single binding-site, alternating-access mechanism.