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71.
This article reports a calibration procedure that enables researchers to track movements of the eye while allowing relatively
unrestricted head and/or body movement. The eye—head calibration algorithm calculates fixation point based on eye-position
data acquired by a head-mounted eyetracker and corresponding head-position data acquired by a 3-D motion-tracking system.
In a single experiment, we show that this procedure provides robust eye-position estimates while allowing free head movement.
Although several companies offer ready-made systems for this purpose, there is no literature available that makes it possible
for researchers to explore the details of the calibration procedures used by these systems. By making such details available,
we hope to facilitate the development of cost-effective, nonproprietary eyetracking solutions. 相似文献
72.
Three studies examined how people maintain their self-images when they face threat to interpersonal aspects of the self. In Studies 1 and 2, we found evidence that low self-esteem people lower their estimates of their performance when they expect immediate feedback in order to protect themselves from the interpersonal threat inherent in such feedback, and that self-affirmation reduces this tendency among low self-esteem people. In Study 3, we found that when people are self-affirmed they are more likely to engage in upward social comparisons and less likely to engage in downward social comparisons. Together these findings suggest that people can cope with threats to interpersonal aspects of the self by affirming other important aspects of the self. 相似文献
73.
Spencer A. McWilliams 《Counseling and values》2010,55(1):79-100
Constructivist and Buddhist approaches to counseling and psychotherapy share increasing popularity as well as similar epistemological assumptions and understanding of human dysfunction and its amelioration. These approaches can be seen as consistent with postmodern psychology, which is distinguished from a realist or foundationalist view. This article provides an overview of these 2 models and describes some of their implications for psychopathology and psychotherapy, including examples of specific therapeutic approaches drawn from each perspective that might mutually inform practitioners who wish to apply this perspective to a higher view of the human situation. 相似文献
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David R. Thomas Melissa Lusky Spencer Morrison 《Attention, perception & psychophysics》1992,51(6):529-540
Six experiments were carried out to compare go/no-go and choice paradigms for studying the effects of intradimensional discrimination training on subsequent measures of stimulus generalization in human subjects. Specifically, the purpose was to compare the two paradigms as means of investigating generalization gradient forms and frame of reference effects. In Experiment 1, the stimulus dimension was visual intensity (brightness); in Experiment 2, it was line orientation (line-angle stimuli). After learning to respond (or to respond “right”) to stimulus value (SV) 4 and not to respond (or to respond “left”) to SV2 (in Experiment 1) or SV1 (in Experiment 2), the subjects were tested for generalization (recognition) with an asymmetrical set of values ranging from SV1 to SV11. Go/no-go training produced peaked gradients, whereas choice training produced sigmoid gradients. The asymmetrical testing resulted in a gradual shift of the peak of responding (go/no-go group) or in the point of subjective indifference (PSI; choice group) toward. the central value of the test series; thus, both paradigms revealed a frame of reference effect. The results were comparable for the quantitative (intensity) and the qualitative (line-angle) stimulus dimensions. Experiment 3 compared the go/no-go procedure with a yes/no procedure in which subjects responded “right” to SV4 and “left” to all other intensities and found no differences between these procedures. Thus the difference in gradient forms in go/no as opposed to (traditional) choice paradigms depends on whether one or two target stimuli are used in training. In Experiment 4, in which visual intensity was used, the shift in the PSI following choice training varied positively with the range of asymmetrical test stimuli employed. In Experiment 5, also with visual intensity, the magnitude of the peak shift following go/no-go training varied as a function of over representing a high or a low stimulus value during generalization testing. Experiment 6, with line angles, showed that the PSI following choice training varies in a similar way. The frame of reference effects obtained in these experiments are consistent with an adaptation-level model. 相似文献
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The functional substitutability of stimuli in equivalence classes was examined through analyses of the speed of college students'' accurate responding. After training subjects to respond to 18 conditional relations, subjects'' accuracy and speed of accurate responding were compared across trial types (baseline, symmetry, transitivity, and combined transitivity and symmetry) and nodal distance (one- through five-node transitive and combined transitive and symmetric relations). Differences in accuracy across nodal distance and trial type were significant only on the first tests of equivalence, whereas differences in speed were significant even after extended testing. Response speed was inversely related to the number of nodes on which the tested relations were based. Significant differences in response speed were also found across trial types, except between transitivity and combined trials. To determine the generality of these comparisons, three groups of subjects were included: An instructed group was given an instruction that specified the interchangeability of stimuli related through training; a queried group was queried about the basis for test-trial responding: and a standard group was neither instructed nor queried. There were no significant differences among groups. These results suggest the use of response speed and response accuracy to measure the strength of matching relations. 相似文献
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