Effects of list length and first-trial reward upon concurrent discrimination performance

Rhesus monkeys were given 2304 two-trial object discrimination problems that were presented as members of lists consisting of two, four, or eight problems. The problems within each list were presented concurrently, Trial 1 for all problems in the list being presented before initiation of Trial 2 for any problem. Each problem involved exposure of a single object on Trial 1, which was either rewarded or not rewarded, followed by presentation of the Trial 1 object along with a second object on Trial 2. Performance varied inversely with list length, and this effect became more prominent as a function of training. Performance after Trial 1 nonreward was substantially better than that after Trial 1 reward, and this effect became enhanced both with continued training and with increased list length. The findings were discussed in terms of Bessemer's short-term memory analysis of learning set.     

The effects of television on children's stereotyping of women's work roles

Sixty-seven elementary school students, ages 5 through 10 years, from three ethnic groups were systematically exposed, over a 1-month period, to specially produced television commercials. One treatment group viewed prevideotaped cartoons interspersed with commercials of women in “traditional” roles, while a second group viewed the same cartoons but with commercials which portrayed women in traditionally male or “reversed” roles. Children were measured on pre-and post-tests on (1) their occupational knowledge, (2) the extent to which they stereotyped occupations, and (3) their own preferences for traditionally male and female jobs. Results indicate that children do learn about occupations from television content, that they also learn to stereotype or nonstereotype various occupations based on the sex of the TV model, and, finally, that girls will change their preferences for various occupations based on the particular roles they view women portrayed in.     

Operational efficiency and the growth of short-term memory span

Four studies are reported which link developmental increases in memory span with developmental increases in operational speed or efficiency. In the first, a linear relationship is demonstrated between increases in word span and increases in speed of word repetition. In the second, adults and 6-year-olds are equated on speed of word repetition, by manipulating word familiarity. It is shown that their word spans are no longer different under these conditions. Similar findings are then reported for a test of M space called “Counting Span.” First, a linear relationship is demonstrated between increases in Counting Span and increases in speed of counting. Next, adults and 6-year-olds are equated on speed of counting, by forcing adults to count in an unfamiliar language. It is shown that their counting spans are no longer different under these conditions. The conclusion is that developmental increases in memory span do not result from increases in total processing space. Rather, with development, basic operations become faster and more efficient. This means that they require less processing space, and that more space becomes available for storage as a result.     

Microcomputers in schools: Impact on the social life of elementary classrooms

Microcomputers are becoming increasingly available to schools, but little research is available concerning the impact of this technology for children. Two studies were conducted to examine some possible social effects of the use of microcomputers in elementary school classrooms where children are learning to program in LOGO. First, the task-related interaction that children engaged in with each other was observed and recorded in two classrooms (8- to 9-year-old s, and 10- to 11-year-olds) as the children worked on both computer and non-computer tasks. The children in both classrooms were significantly more likely to collaborate with each other when they worked with the computers, when compared with their interaction over other classroom tasks. The second study examined children's perceptions of their peers as resources for help with a variety of classroom tasks. When compared with other work, the computer context was the one where children more consistently identified certain of their peers as resources for help.     

Holland's theory and college-degreed working black and white women

The main concern of this study was to investigate differences between black and white women employed in traditional male occupations who took the Vocational Preference Inventory (VPI) and the Self-Directed Search (SDS). The VPI and the SDS were administered to 155 black and white college-degreed workers in three occupations (engineering, medicine, and law) corresponding to three of Holland's environmental categories (Realistic Investigative, and Enterprising). In general, the findings for the three VPI and SDS scales for these occupational groups indicate that white women when compared to black women in the same occupation tend to report similar mean raw scores.