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How is attention distributed over visual space when an observer expects a target to occur at one of several possible locations? Two experiments sought to understand the source of the conflict between studies leading to the notions of hemifield activation (Hughes and Zimba 1985) and attentional gradients (Downing and Pinker 1985; Shulman et al. 1985, 1986). Subjects were cued to attend one of the 4 corners of an imaginary square centered at fixation, allowing comparison of uncued locations in the cued and uncued hemifields. In one experiment marking of the 4 locations was varied to determine if providing a ‘target’ for attention is necessary to obtain within-hemifield gradients. RT was faster at the cued location than at the three uncued locations which had equivalent latencies, a pattern that was unaffected by marking of the potential target locations. This result, which is consistent with the notion of a gradient around the attended location is a strong disconfirmation of the hemifield activation hypothesis. The second experiment demonstrated that an unusual procedure for presenting the probe stimuli in Hughes and Zimba (1985) is at least partially responsible for their evidence for uniform hemifield activation. It is proposed that visual attention is directed to visuo-spatial channels with fixed structural properties, and that when attention to two locations is desired, the subject may attend a spatial channel located between them. 相似文献
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McCormick RA 《America》1985,153(17):396-403
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A battery of information processing measures and psychometric tests of specific and general cognitive abilities was administered to a sample of 105 individuals which included 34 monozygotic and 13 dizygotic reared apart twin pairs or triplets. Correlations between information processing parameters and psychometric abilities as well as twin resemblances for the information processing parameters were examined. In a principal components analysis of the information processing parameters, three components were identified which accounted for 67% of the total variation; Overall Speed of Response (OSR), Speed of Information Processing (SIP), and Speed of Spatial Processing (SSP). OSR was significantly correlated with WAIS IQ, and psychometric measures of verbal reasoning, spatial ability, and perceptual speed and accuracy. SIP was significantly correlated with WAIS IQ, measures of verbal reasoning, and one of the perceptual speed and accuracy measures. SSP was significantly correlated with measures of both spatial ability and perceptual speed and accuracy. Due to the small size of the dizygotic twin sample, no strong conclusions could be drawn regarding the magnitude of their resemblance. The correlation between component scores of reared apart monozygotic twins was significant for OSR, but not for SIP or SSP. 相似文献
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The word-length effect is the advantage that lists of short words show over lists of long words in immediate recall. Typically, the word-length effect is used as strong support for decay-based theories of immediate retention. However, the present two experiments show that the traditional word-length effect emerges only after several trials in an experimental session, a result reminiscent of earlier findings in distractor-based short-term forgetting experiments. These results suggest that any complete account of the word-length effect will need to consider a role for proactive interference. 相似文献
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Richard A McCormick 《Christian Bioethics: Non-Ecumenical Studies in Medical Morality》1995,1(1):97-101
The human person makes great demands on the physician and calls for unique attention. Hence the doctor-patient relationship calls for the highest ideals of kindness, patience, trustworthiness, generosity and skill. The Catholic physician brings to these demands a specific meaning: ministering to the sick is to see Christ in them and to show Him to them. 相似文献
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Meredith Child Kathryn Graff Low Cheryl McDonell McCormick Andrew Cocciarella 《Sex roles》1996,34(5-6):447-455
Transsexuals, because of their attempts at gender reversal, offer a unique opportunity to study self-presentation, social roles, and stereotypes. The present study is a content analysis of personal advertisements of male-to-female transsexuals (TM, N =99), homosexual (HoM, N =64) and heterosexual men (HM, N =99), and heterosexual women (HW, N =99). Advertisements were coded for the presence or absence of 11 characteristics either offered or sought, based on the 1984 work of Deaux and Hanna. The content of TM personal advertisements was significantly different from those of HW, HM, or HoM. TM mentioned physical characteristics and sincerity, and requested friendship most often; HoM mentioned sexuality most often; HM offered financial security and status in the form of occupation, and listed marital status most often; and HW offered personality characteristics and attractiveness most often. Several factors may contribute to the pattern of differences observed, including the fact that TM were more likely to be seeking friendship than sexual partners, in contrast to the other three groups. 相似文献
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