Rapid Gains in Speed of Verbal Processing by Infants in the 2nd Year

Infants improve substantially in language ability during their 2nd year. Research on the early development of speech production shows that vocabulary begins to expand rapidly around the age of 18 months. During this period, infants also make impressive gains in understanding spoken language. We examined the time course of word recognition in infants from ages 15 to 24 months, tracking their eye movements as they looked at pictures in response to familiar spoken words. The speed and efficiency of verbal processing increased dramatically over the 2nd year. Although 15-month-old infants did not orient to the correct picture until after the target word was spoken, 24-month-olds were significantly faster, shifting their gaze to the correct picture before the end of the spoken word. By 2 years of age, children are progressing toward the highly efficient performance of adults, making decisions about words based on incomplete acoustic information.     

Group Size Effects on Risk Perception: A Test of Several Hypotheses

Yamaguchi (1998) found that people perceived a lower level of risk in a group than when they were alone, despite the fact that being in a group did not reduce the objective level of risk. Three experiments were conducted to examine several potential explanations for this effect. Experiment 1 replicated the group size effect in self-perception as well as the perception of the risk level of others. Results did not support the interdependence hypothesis and the affiliation hypothesis. Experiments 2 and 3 tested a hypothesis based on the availability heuristic. The group size effect was reduced or nullified when the target of risk judgment was associated with risk-seeking behavior or when an accident, in which many people died, was made salient.     

Trends in Gender Differences in Academic Achievement from 1960 to 1994: An Analysis of Differences in Mean,Variance, and Extreme Scores

Gender differences in academic achievement have been studied extensively. While it is generally agreed that females have a slight advantage on average in verbal abilities and males have a slight advantage on average in mathematics, it is unclear whether these differences have changed over time. In this paper evidence from seven surveys representative of the United States twelth grade student population and the National Assessment of Educational Progress(NAEP) long term trend data is brought to bear on the magnitude of gender differences in achievement, the level of agreement among different indices of difference, and the stability of these differences over time. These data provide the unique opportunity to not only empirically estimate mean differences, differences in variance, and differences in extreme scores, but also to estimate change over time in all three indices using both the same and different tests over time. Results show that gender differences in mean and variance are small, while differences in extreme scores are often substantial. None of these differences have changed significantly since 1960, with the possible exception of mean differences in mathematics and science. Each of the datasets reflects the racial composition of the national population when properly weighted (i.e. White = 70%, Black = 15%,Hispanic = 10%, Other = 5%).     

The relationship between masculine gender role stress and psychological adjustment: A question of construct validity?

Masculine gender role stress is a theoretical construct that describes the stress created in men when they feel they are not meeting society's expectations for masculinity, or when the situation forces men to act in feminine-typed ways. The stress produced by these feelings or actions are thought to be related to negative psychological outcomes for men, but should be unrelated to well-being for women. The present study investigated the validity of the masculine gender role stress construct, especially with regard to the assumption that masculine gender role stress is related to negative psychological outcomes for men more than for women. Participants were a group of mostly Caucasian undergraduates. Results indicated that masculine gender role stress was related to depression, hostility, and anxiety, but to the same degree for both men and women. These findings suggest that, if MGRS is a valid construct, then researchers need to explore other ways in which this type of stress can negatively affect men, but not women.     

Separate Digits tests: A brief history,a literature review,and a reexamination of the factor structure of the test of memory and learning (TOMAL)

Following a brief history of Digit Span, a review of 27 articles, selected from 76, addresses the question of whether to scale Digits Forward and Backward separately. The review begins with studies involving Digits Forward, followed in turn by studies of Digits Backward and of both subtests. Finally, the loadings of four TOMAL subtests, Digits Forward and Backward and Letters Forward and Backward, undergo examination in the context of two, three, and four factor promax solutions, with corresponding varimax solutions provided for comparison. The analysis leads to several conclusions. Though Digits Forward and Backward show similarities, they load differently in the three and four factor solutions; Digits Backward also displays a spatial element, and perhaps a transformative element, not apparent in Digits Forward. Moreover, the differences between the two measures have important neurologic and diagnostic implications.     

An object-oriented simulation of anorexia based on brain structure interaction

A computer simulation using an object-oriented strategy was developed to model brain mechanisms that underlie eating disorders. The simulation was based on neuroanatomical and neurochemical evidence from published literature. Testing of the simulation required that the activity levels of the raphe nuclei of the brain stem be altered and the resulting activity levels of associated brain structures be compared with results from human and animal data. The results supported the serotonin hypothesis of anorexia that increasing the activity level of the raphe nuclei would result in dramatic changes in the activity level of the paraventricular nucleus. The findings are discussed with respect to the feasibility of computer simulations to test theories of brain-based disorders.     

Sexual harassment experiences and equal opportunity perceptions of Navy women

In 1989, the Navy began tracking the sexual harassment rates among its officer and enlisted personnel by administering the Navy Equal Opportunity Sexual Harassment (NEOSH) Survey on a biennial basis. While previous reports on the results of the NEOSH Survey have discussed the occurrence, frequency, and effects of sexual harassment in the Navy [A. L. Culbertson, P. Rosenfeld, and C. E. Newell (1993) Sexual Harassment in the Active-Duty Navy: Findings from the Navy-Wide Survey (TR-94-2), San Diego, CA: Navy Personnel Research and Development Center], this study examines whether victims of sexual harassment differ in their perceptions of equal opportunity (EO) climate from those who have not been harassed. Data from the 1991 NEOSH Survey were reanalyzed. Sixty-seven percent of the women officers were White, 25% African-American, and 18% Hispanic. Of the women enlisted, 52% were White, 31% African-American, and 18% Hispanic. The results indicated that women who were sexually harassed perceived that there was less EO in the Navy than women who had not been harassed. This was true for both officer and enlisted personnel. In addition, specific organizational consequences of sexual harassment were identified.The opinions expressed in this paper are those of the authors, are not official and do not necessarily represent the views of the Navy Department.     

Emphasis as a prompt for verbal imitation

Four- and five-yr-old disadvantaged children were read sentences composed of varying numbers of short phrases. The children were asked to repeat each sentence, but the accuracy of their imitations was not differentially reinforced. The teacher stressed (emphasized) certain words as she read each sentence. The proportion of words that were stressed was systematically varied. In general, the children imitated only parts of most sentences. Stress was effective in influencing which parts of a sentence the children would imitate, but only when relatively few words were stressed. Stressing a word increased the probability of a child's imitating that word (and, to a large extent, the entire phrase containing that word) as an inverse function of the proportion of the words that were stressed.