Birth order and introversion-extraversion

The relationship between birth order and introversion-extraversion was investigated. Subjects were 70 male and 77 female undergraduates, all from three-child families. The measure of introversion employed was the Social Introversion Scale (Scale 0) of the Minnesota Multiphasic Personality Inventory. A two-way analysis of variance indicated that first borns were more introverted than either middle-horns or last-horns, with no difference between the latter two groups. It was suggested that inconsistent results in this area may be due to the use of different measures of introversion.     

USE OF THE GATB “G” SCORE FOR PREDICTING ACHIEVEMENT ON THE GED

The present study investigates the relationship of the GATB “G” with the GED. Practical and theoretical implications are involved. Making use of samples from the Las Vegas, Nevada population, the study compares scores of individuals administered the GED and GATB. A substantial correlation for prediction purposes was devised to illustrate the use of the GATB “G” to predict, by interval, an individual's position on the GED. The expectancy table helps guide the Vocational Counselor with a constructive tool whereby he advises the next steps of action for an educationally deficient or proficient client. The study recommends further replications to determine if such studies could guide agency policies whereby vocational counseling practice is improved and agency testing costs reduced.     

Isolation-induced aggression in newly hatched ducklings.

Newly hatched Khaki Campbell ducklings (Anas platyrhynchos domesticus) were initially housed in pairs and subsequently transferred to isolated housing conditions. Subjects living with another bird displayed filial behavior and little aggression upon encountering another duckling in a test arena. In contrast, ducklings housed in isolation exhibited aggressive pecking in addition to filial behavior when another duckling was subsequently encountered. In Experiment 2, ducklings were housed with an imprinting object (i.e., an object that elicits attachment behavior), but they were otherwise isolated from other birds. These subjects displayed little aggression when they were subsequently reunited with a conspecific, indicating that the aggression-precluding effects of social housing are not limited to the particular social stimulus with which the ducklings are housed. In Experiment 3, ducklings were again housed with an imprinting object, but this time the object was behind glass, thereby precluding tactile contact with it. Since these birds also exhibited little aggression when reunited with a conspecific, it is apparent that visual stimulation from an imprinting object is sufficient in itself to preclude subsequent aggression. These findings suggest that stimulation that elicits attachment behavior is the critical factor mediating isolation-induced aggression.     

Utilization of context for word identification decisions in children

The use of context was investigated with subjects from fourth- and sixth-grade populations. A Word Boundary task was used that requires subjects to make word-identification decisions both with and without contextual information. Results indicated that context was utilized effectively by the sixth-grade students, while the fourth-grade students showed small context-use effects. These findings are consistent with performance models that emphasize the role of predictive behavior in language analysis.     

The influence of serial retention and theme identification paradigms on encoding

Half the subjects attempted to remember the order of presentation of stimulus lists of words; the other half tried to determine the theme of the words. Encoding features were evaluated with surprise recognition tests. Greater auditory encoding was obtained for the stimulus words in the serial retention condition than for the same words in the theme identification condition. Semantic encoding was only obtained in the theme identification condition. These results were discussed in terms of the flexibility of encoding strategies.     

Hemispheric differences in semantic processing: Category matching is not the same as category membership

Two closely related semantic processing tasks were studied under identical procedural conditions in order to examine lateral visual field effects on reaction times. In Experiment 1, reaction times did not differ as a function of visual field when subjects decided whether a lateral word was a member of a foveally presented category word (category membership task). On the other hand, reaction times were faster for right than for left visual field stimulus presentations when subjects decided whether two words, one lateral and one foveal, belonged to the same category (category matching task), although this advantage did not occur immediately. In Experiment 2, the laterality effect in the category matching task was studied as a function of word familiarity. Two groups of subjects performed the matching task for two blocks of trials, one group receiving the same word list in each block and the other receiving different lists. No visual field differences in reaction times were observed for either group during the first block of trials, but a distinct right field advantage appeared for both during the second block. The data from these experiments suggest that category matching strategies rely upon structures or processes localized in the left hemisphere, although their influence is not immediate. Category membership strategies, on the other hand, do not depend upon such localized structures.