Proportion compatible manipulations are often used to index strategic processes in selective attention tasks. Here, a subtle confound in proportion compatible manipulations is considered. Specifically, as the proportion of compatible trials increases, the ratio of complete repetitions and complete alternations to partial repetitions increases on…

Simple and complex addition problems were presented for true/false verification to 30 undergraduate students to test a general model for cognitive addition. Problems were presented on a microcomputer, with reaction time (RT) and response accuracy recorded. Models for addition were fit to average RT data using multiple regression techniques. These…

Assesses performance of 9-, 13-, and 20-year-olds on 3,840 trials of a mental rotation task in which subjects judged if pairs of stimuli presented in different orientations were identical or mirror images. Results are discussed in terms of possible mechanisms underlying the impact of practice. (Author/NH)

Naming speed skills of 45 dyslexic children (mean ages=8, 13, and 17) and slow learning children (mean age=10) were compared with those of normally achieving children. Results indicated that children with dyslexia and slow learners have persistent and severe problems in naming speed for all stimuli, regardless of whether the stimulus requires…

The way cognitive, event-related brain potentials (ERPs) can aid in further understanding of memory span change in children is discussed. ERPs are time-dependent changes in electrical activity of the brain (as recorded by scalp electrodes) following the presentation of a physical stimulus through auditory, visual, or somatosensory modalities. The…

The processing of mental structures in perception appears to be serial, in that viewers can fill in missing parts from an impoverished stimulus following a top down process. To investigate the effects of unfamiliarity, complexity, and legibility on object and layout perception of unfamiliar stimuli, ten subjects were shown one of four ribbon…

The widespread incidence of depression has promoted many theories about what variables are involved in this disorder. Beck has theorized that a depressive's negative affect results from a schema of negative views toward oneself. Gotlib and McCann have concluded that depressives have greater accessibility than nondepressives to negative content…

Experiments were conducted on the speed of encoding differences between 15 school-age individuals with and 15 individuals without mental retardation, while retaining a full memory load or half memory load. Subjects with mental retardation allocated fewer attentional resources to encoding, even though encoding may require more of their resources…

Tests two hypotheses concerning developmental change in the speed of cognitive processes: (1) age differences in processing time reflect changes that are specific to particular tasks, and (2) age differences in processing speed do not reflect task-specific change but are due instead to more general developmental change. (HOD)

More than 100 college students enrolled in a reading and study skills course participated in a study designed to show the effects of retrieval speed on adult reading comprehension. A microcomputer version of the Posner task was used to measure memory retrieval speed, and reading and listening comprehension were measured from McCall-Crabbs…

Cognitive processes, particularly in regard to negative content schemata, seem to play an instrumental role in the development and maintenance of depression. In order to better understand the nature of negative schemata in depressed individuals, both depressed and nondepressed subjects participated in two studies in which they were required to…

Recent studies of self-referent cognition have demonstrated that people process information about themselves more efficiently than other kinds of information. To investigate latency effects in self-referent decision-making, 60 college students participated in a three phase study. In phase one, each subject chose the trait within a pair that best…

In recent research, two qualitatively different classes of mental operations have been identified. The performance of one type of cognitive task requires attention, in the sense of mental effort, for its execution, while the second type can be performed automatically, independent of attentional control. Further research has shown that automatic…

This study explored the relationship between traditional item difficulty and cognitive complexity as measured by response time. Rural students (n=43) responded to computer-based tests of the Individualized Study by Technology General Mathematics Course developed by Alaska's Department of Education. Results indicated that mean response times were…