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71.
The aim in this study was to identify predictors of perceived social support before and after cataract surgery. We hypothesized that physical (comorbidity and visual acuity) and mental (depressive symptoms) health indicators would be directly and indirectly (through actually received support) associated with perceived support. One hundred and thirty-six cataract patients (69% women; mean age = 71.6 years) completed questionnaires before and after cataract surgery. Results showed that received support partially mediated the association between depressive symptoms and perceived support. However, mental and physical health variables were also directly associated with perceived support. We conclude that health status might feedback to perceptions of available support. 相似文献
72.
Alena Erke Fridulv Sagberg Rolf Hagman 《Transportation Research Part F: Traffic Psychology and Behaviour》2007,10(6):447-457
Effects of route guidance Variable Message Signs (VMS) on speed and route choice were investigated in a field study on two sites on motorways. Two VMS were used in the study, which displayed information about a closed road section downstream on the motorways and recommendations for alternative routes. Route choice, speed and braking behaviour were compared between vehicles approaching the VMS while they displayed messages and while they were left blank without message. There was high compliance with the messages on the VMS. About every fifth vehicle changed route choice according to the recommendation, and almost none drove as far as the closed road section. Speed measurements of 3342 vehicles showed large speed reductions, and video observations showed that large proportions of vehicles braked while approaching the VMS. The speed reductions and braking manoeuvres can partly be attributed to attention overload or distraction due to the information on the VMS. However, a proportion of the speed reductions was due to chain reactions where one vehicle braked and forced the following vehicles to brake or change lanes in order to avoid collisions. Safety problems may result directly from distraction, or indirectly from the reactions of the drivers to the distraction. 相似文献
73.
Within the context of the psychological refractory period (PRP) paradigm, we developed a general theoretical framework for deciding when it is more efficient to process two tasks in serial and when it is more efficient to process them in parallel. This analysis suggests that a serial mode is more efficient than a parallel mode under a wide variety of conditions and thereby suggests that ubiquitous evidence of serial processing in PRP tasks could result from performance optimization rather than from a structural bottleneck. The analysis further suggests that the experimenter-selected distribution of stimulus onset asynchronies (SOAs) influences the relative efficiency of the serial and parallel modes, with a preponderance of short SOAs favoring a parallel mode. Experiments varying the distribution of SOAs were conducted, and the results suggest that there is a shift from a more serial mode to a more parallel mode as the likelihood of short SOAs increases. 相似文献
74.
Perceptual learning was used to study potential transfer effects in a duration discrimination task. Subjects were trained
to discriminate between two empty temporal intervals marked with auditory beeps, using a twoalternative forced choice paradigm.
The major goal was to examine whether perceptual learning would generalize to empty intervals that have the same duration
but are marked by visual flashes. The experiment also included longer intervals marked with auditory beeps and filled auditory
intervals of the same duration as the trained interval, in order to examine whether perceptual learning would generalize to
these conditions within the same sensory modality. In contrast to previous findings showing a transfer from the haptic to
the auditory modality, the present results do not indicate a transfer from the auditory to the visual modality; but they do
show transfers within the auditory modality. 相似文献
75.
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77.
Three experiments examined whether temporal uncertainty about the delivery of a response stimulus affects response force in a simple reaction time (RT) situation. All experiments manipulated the foreperiod; that is, the interval between a warning signal and the response stimulus. In the constant condition, foreperiod length was kept constant over a block of trials but changed from block to block. In the variable condition, foreperiod length varied randomly from trial to trial. A visual warning and response stimulus were used in Experiment 1; response force decreased with foreperiod length in the variable condition, but increased in the constant condition. This result is consistent with the hypothesis that responses are less forceful when the temporal occurrence of the response stimulus is predictable. In a second experiment with an auditory warning signal and a response stimulus, response force was less sensitive to foreperiod manipulations. The third experiment manipulated both the modality and the intensity of the response signal and employed a tactile warning signal. This experiment indicated that neither the modality nor the intensity of the response signal affects the relation between response force and foreperiod length. An extension of Näätänen’s (1971) motor-readiness model accounts for the main results. 相似文献
78.
In a previous study, slow negative shifts were found in the EEG of subjects listening to well-known melodies. The two experiments reported here were designed to investigate the variables to which these slow potentials are related. In the first experiment, two opposite hypotheses were tested: The slow shifts might express subjects' acquaintance with the melodies or, on the contrary, the effort invested to identify them. To this end, some of the melodies were presented in the rhythms of other melodies to make recognition more difficult. Further, melodies rated as very well-known and as very unknown were analysed separately. However, the slow shifts were not affected by these experimental variations. Therefore in the second experiment, on the one hand the purely physical parameters intensity and duration were varied, but this variation had no impact on the slow shifts either. On the other hand, recognition was made more difficult by monotonously repeating the pitch of the 4th tone for the rest of some melodies. The slow negative shifts were enhanced with these monotonous melodies. This enhancement supports the "effort" hypothesis. Accordingly, the ofter shifts obtained in both experiments might likewise reflect effort. But since the task was not demanding, it is suggested that these constant shifts reflect the effort invested for coping with the entire underarousing situation rather than with the task. Frequently, slow eye movements occurred in the same time range as the slow potentials, resulting in EOG potentials spreading to the EEG recording sites. Yet results did not change substantially when the EEG recordings were corrected for the influence of EOG potentials. 相似文献
79.
Rolf G. Jacob Deborah C. Beidel Alvin P. Shapiro 《Journal of psychopathology and behavioral assessment》1984,6(2):159-165
A new procedure of assessing adherence to home practice of relaxation is presented. The technique involved the subject identifying one of four possible relaxation words of the day at the end of a taped relaxation session. The method was employed to assess the relationship between adherence to relaxation and decline of blood pressure during a 10-session/8-week relaxation program involving 17 hypertensive subjects. No statistically significant relationship was found on either a short-term or a long-term basis. An advantage of the assessment technique is that it appears easily integrated into the overall therapeutic objective for relaxation therapy; a disadvantage is that the subject needs to comply not only with the relaxation schedule but also with the monitoring procedure.This research study was funded by NIH Grant HL27159. 相似文献
80.
Rolf A. Peterson 《Sex roles》1983,9(3):321-331
Two studies assess attitudes toward the childless life-style. One study uses an unstructured response style in order to determine the motivation for and effects of the decision attributed to the person intending to be childless. The second study assesses the relationship between self-reported attitudes measures. The studies suggest the person selecting the childless life-style may be viewed by others as less well adjusted or misguided in this choice, which is inconsistent with the majority of published data on the childless spouse. 相似文献