Left-hemisphere language lateralization in bilinguals: use of the concurrent activities paradigm

Previous visual and auditory lateralization studies have demonstrated that the languages of bilinguals are lateralized to the left hemisphere to the same extent as in monolingual controls (C. Soares & F. Grosjean, 1981, Perception and Psychophysics, 29, 599-604; C. Soares, 1982, Neuropsychologia, 20, 653-659). The present study tested the same group of Portuguese-English bilinguals and a group of English-speaking monolinguals on a series of concurrent activity, or time-sharing, tasks. Greater levels of disruption in finger tapping with the right hand than with the left hand occurred during the performance of those tasks which required overt speech production, and this for both bilinguals and monolinguals. As in the previous studies, there were no lateralization differences across the bilinguals' two languages or between bilinguals and monolinguals. Thus, further evidence for equal levels of left-hemisphere dominance for language in bilinguals and monolinguals was provided by the use of the concurrent activities paradigm.     

Sheldon's physical-psychical typology revisited

In order to clarify some of the general findings in the literature with respect to relationships between body type and the personality dimension extraversion/introversion, typical experimental paradigms common to this field were replicated but using the first-order factors (from the R. B. Cattell, H. W. Eber, & M. M. Tatsuoka (1970, Handbook for the sixteen personality factor questionnaire, Windsor: N.F.E.R.) analysis) that load on this continuum rather than the continuum itself. Use was made of standard statistical procedures as well as discriminant analysis. The most noteworthy finding was that subjects were able to utilize the first-order factor structure for the continuum extraversion/introversion in a discriminating manner and to assign such factors in a fairly clear-cut way to three extreme body types. Personality appraisals of the mesomorphic body type and an ideal type (composed by the subjects) were shown to be virtually identical. The most positive extravert characteristics were assigned to the endomorph body build and the most positive introvert characteristics to the ectomorph. No differences in personality appraisals by male (n = 50) and female (n = 50) subjects with the exception of factor Q₂ by the ectomorphic body type were found. Both male and female subjects showed a preference for the (male) mesomorphic body type although significant differences between male and female subjects in the pattern of their distribution of preferences over the three body types were found. While the results confirm previous findings, they also extend them by the use of a first-order factor structure for the continuum extraversion/introversion and by the introduction of the explanatory concepts “extravert of affect” and “extravert of action.”     

A new processing model for predicting performance on Pascual-Leone's test of M-space

A new model is proposed for explaining children's performance on Pascual-Leone's test of M-space. The model differs from Pascual-Leone's in three regards. (1) It assumes that children do not stop sampling a compound stimulus until every simple stimulus in their field of attention has already been noticed and responded to. (2) It assumes that the probability of sampling different combinations of simple stimuli conforms to the laws of Maxwell-Boltzman statistics rather than Bose-Einstein statistics. (3) It assumes that children's ability to detect all the simple stimuli in a compound stimulus is highly dependent both on the relative saliencies of the simple stimuli and on the length of time for which the compound stimulus is exposed. Using the developmental values of M hypothesized by Pascual-Leone, and standard techniques of computer simulation, the new model is used to generate theoretical performance curves for children at four different age levels and seven different levels of stimulus complexity. It is shown that the predicted performance curves for an exposure time of 5 sec provide a reasonable fit to the data originally reported by Pascual-Leone (1970), and that the predicted performance curves for an exposure time of 10 sec provide a reasonable fit to data obtained more recently by Parkinson (1976). Finally, it is shown that the order of children's responses as well as the number of their responses can be predicted. Two conclusions are drawn. (1) The new processing model offers a viable alternative to the model originally proposed by Pascual-Leone. (2) Regardless of which processing model is employed, the M-values originally postulated by Pascual-Leone are valid.     

Does word training increase or decrease interference in a stroop task?

First and second graders (6- and 7-year-olds) practiced reading 20 words. Before and after word training, they named pictures printed with and without these words as distractors. Of interest was whether training would enhance or diminish the interference created by these words in the picture-naming task. Results indicated that children who learned to recognize unfamiliar distractor words more accurately suffered more interference after training. In contrast, children who were already familiar with the words and learned to recognize them faster experienced less interference following training. Results are interpreted as supporting LaBerge and Samuels' model of automatic word processing. Effects of accuracy training are attributed to the elimination of attention as a requirement for processing distractor words. Effects of speed training are attributed to a reduction in the time consumed by distractor words in the central processor.     

Developmental differences in motor task integration: A test of Pascual-Leone's Theory of Constructive Operators

This study assessed the ability of Pascual-Leone's Theory of Constructive Operators to predict the minimum age or maturational level at which integration of a motor task could be achieved. Children 5–12 years of age (n=114) performed a discrete motor task requiring a constrained circular movement to be integrated with an unconstrained linear movement to a target. The Theory of Constructive Operators and the principles of constructive cognition were used to generate a model of task performance. Based on the model and in accordance with the theory, it was predicted that 5- to 6-year-old subjects would lack the cognitive capacity (M-capacity) to efficiently integrate this task. An analysis of covariance for age was performed on task parameters reflecting integration (and highest M-demand) with movement speed as the covariate. Scheffé contrasts supported the prediction as 5- to 6-year-old subjects were inferior to each of the other age groups (p < .05). Furthermore, no significant differences were found to exist between any of the older age groups.     

Ethnography of an auto body repair class: Some implications for cultural transmission

This paper is a study of an ethnography of an auto body repair class in a postsecondary technical school. The class provides the students with the auto body repair skills. The students also learn employer/worker relationships and worker/worker relationships. The students learn their skills by doing them. They learn the role of a worker by being in a situation which simulates an auto body shop situation.     

A case study approach to delivering and evaluating services by a school psychologist

Two interrelated problems in delivering school psychological services by one school psychologist acted as a motivating force behind this study: the problem of how to plan and render services to a school system where the ratio of students to school psychologists is high, and the problem of how to determine the degree of effectiveness of these services. This study describes an approach which consisted of three distinct services rendered by a school psychologist. Evaluative measurements of the services were made in two areas: the effect of the services on the ongoing operations of the system, and the evaluation of the services by school personnel exposed to the services directly or indirectly. The relative merits and the limitations of such an approach are discussed.     

Modeling spatial knowledge

A person's cognitive map, or knowledge of large-scale space, is built up from observations gathered as he travels through the environment. It acts as a problem solver to find routes and relative positions, as well as describing the current location. The TOUR model captures the multiple representations that make up the cognitive map, the problem-solving strategies it uses, and the mechanisms for assimilating new information. The representations have rich collections of states of partial knowledge, which support many of the performance characteristics of common-sense knowledge.