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A series of four studies explore how the presentation of multiple items on each trial of a categorization task affects the
course of category learning. In a three-category supervised classification task involving multi-dimensionally varying artificial
organism-like stimuli, learners are shown a target plus two context items on every trial, with the context items’ category
membership explicitly identified. These triads vary in whether one, two, or all three categories are represented. This presentation
context can support within-category comparison and/or between-category contrast. The most successful learning occurs when
all categories are represented in each trial. This pattern occurs across two different underlying category structures and
across variations in learners’ prior knowledge of the relationship between the target and context items. These results appear
to contrast with some other recent findings and make clear the potential importance of context-based inter-item evaluation
in human category learning, which has implications for psychological theory and for real-world learning environments. 相似文献
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This study presents a data set for a reference group on the Reitan-Indiana Neuropsychological Test Battery for Young Children. The data set is based on a sample of 224 children, ages 5 to 8 years, referred to a special services cooperative for academic or behavioral concerns during the years 1980 through 1993. Data are presented in terms of sample size, means, standard deviations, diagnostic classifications, and population characteristics. Previously published data sets are reviewed in comparison to this newly acquired data set. Potential advantages of this data set include the larger sample, contemporary data collection, and a sample drawn from a United States school-referred population. 相似文献
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Nelson H. Hendler Andrew Livingston 《Integrative psychological & behavioral science》1978,13(3):187-193
Central nervous system effects have been demonstrated for angiotensin II and suggested for aldosterone. In order to determine whether either of these chemicals naturally crosses the blood-brain barrier, radioactive aldosterone and angiotensin II were introduced via intracardiac injections in rats. Samples of blood, liver, kidney, adrenals, cerebral cortex, and hypothalamus were collected at three, 15, and 60 minutes, frozen, dissolved, and counted. Blood levels for aldosterone and angiotensin II remained constant over 60 minutes. Aldosterone accumulated in the liver, kidney, adrenals and hypothalamus three minutes after injection, and levels diminished over time. Angiotensin II levels peaked in the adrenal, kidney, and liver after three minutes, and in the hypothalamus after 15 minutes. Cerebral cortex levels were lower than hypothalamic levels by 30% for aldosterone and 50% for angiotensin II. This suggests that both drugs may enter the central nervous system and selectively accumulate in the hypothalamus. 相似文献
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Vocational guidance services have been developing in Northern Ireland for about thirty years. Recently the careers service has been transferred from an education to a manpower services base, while the schools have been given greater opportunity, and responsibility, for the provision of careers education. The changes have given considerable impetus to careers teacher training, and to the appointment of schools' careers staffs. The possibility of further development of the partnership between careers officers and careers teachers is examined. 相似文献
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Results from 5 experiments provide converging evidence that automatic evaluation of faces in sequential priming paradigms reflects affective responses to phenotypic features per se rather than evaluation of the racial categories to which the faces belong. Experiment 1 demonstrates that African American facial primes with racially prototypic physical features facilitate more automatic negative evaluations than do other Black faces that are unambiguously categorizable as African American but have less prototypic features. Experiments 2, 3, and 4 further support the hypothesis that these differences reflect direct affective responses to physical features rather than differential categorization. Experiment 5 shows that automatic responses to facial primes correlate with cue-based but not category-based explicit measures of prejudice. Overall, these results suggest the existence of 2 distinct types of prejudice. 相似文献
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