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151.
The influence of motor knowledge on speech perception is well established, but the functional role of the motor system is still poorly understood. The present study explores the hypothesis that speech production abilities may help infants discover phonetic categories in the speech stream, in spite of coarticulation effects. To this aim, we examined the influence of babbling abilities on consonant categorization in 6‐ and 9‐month‐old infants. Using an intersensory matching procedure, we investigated the infants’ capacity to associate auditory information about a consonant in various vowel contexts with visual information about the same consonant, and to map auditory and visual information onto a common phoneme representation. Moreover, a parental questionnaire evaluated the infants’ consonantal repertoire. In a first experiment using /b/–/d/ consonants, we found that infants who displayed babbling abilities and produced the /b/ and/or the /d/ consonants in repetitive sequences were able to correctly perform intersensory matching, while non‐babblers were not. In a second experiment using the /v/–/z/ pair, which is as visually contrasted as the /b/–/d/ pair but which is usually not produced at the tested ages, no significant matching was observed, for any group of infants, babbling or not. These results demonstrate, for the first time, that the emergence of babbling could play a role in the extraction of vowel‐independent representations for consonant place of articulation. They have important implications for speech perception theories, as they highlight the role of sensorimotor interactions in the development of phoneme representations during the first year of life.  相似文献   
152.
153.
Gender differences in perception of self-orientation: software or hardware?   总被引:2,自引:0,他引:2  
We evaluated the contribution of attentional strategy to the perception of self-orientation with and without a body tilt in the median plane. Reinking et al (1974 Journal of Personality and Social Psychology 30 807-811) found that the frame dependence of females on the rod-and-frame test could be mediated by instructions prompting them to focus on internal cues (ie arising from inside of the body). Here, we measured the influence of attentional instructions on the perception of the morphological horizon. Eleven females and thirteen males estimated their morphological horizon in an upright and a 45 degrees body tilt in the median plane under three instruction conditions. All participants first performed without attentional instructions. Then, participants performed under both internal and external attentional instructions. For females, but not for males, perception of morphological horizon was more footward in the supine than in the upright orientation. Although instructions did not eliminate gender differences, internal instructions allowed females to reduce their perceptual bias in the supine orientation.  相似文献   
154.
The issues addressed in 2 experiments in which 10 younger and 10 older adults participated were (a) whether the retention of a target location in memory for motor control purposes would be facilitated by an increase in target presentation time; (b) whether increasing the recall delay since the last exposure to the target would have deleterious effects on aiming accuracy or variability, or both; and (c) whether those effects would be mediated by aging. The results revealed that there is a short-lived (< 1 s) visual representation of target location. In addition, the results suggested that the nature of that representation dictates a movement strategy favoring higher peak movement velocity. None of the effects reported in the present study was affected by age, suggesting that the coding and retrieving processes of target location in memory for motor control purposes are not affected by age.  相似文献   
155.
Previous studies have shown that fluency-inducing techniques, such as choral speech, result in changes in neural activation as measured by functional neuroimaging. In the present study, positron emission tomography was used to investigate the effects of intensive behavioural treatment, followed by a 1-year maintenance program, on the pattern of cortical and subcortical activation in stuttering adults during silent and oral reading of single words. The results indicate changes in activation lateralisation, as well as a general reduction in overactivation, especially in the motor cortex, following treatment. The results are discussed in light of previous functional imaging studies with stuttering adults.

Educational objectives: The reader will learn about and be able to describe the: (1) use of functional neuroimaging PET in the study of stuttering; (2) differences in neural activation between stuttering and non-stuttering adults; and (3) effects of behavioural fluency treatment on cortical and subcortical activations in stuttering speakers.  相似文献   

156.
Theorists and researchers interested in employee commitment and motivation have not made optimal use of each other's work. Commitment researchers seldom address the motivational processes through which commitment affects behavior, and motivation researchers have not recognized important distinctions in the forms, foci, and bases of commitment. To encourage greater cross-fertilization, the authors present an integrative framework in which commitment is presented as one of several energizing forces for motivated behavior. E. A. Locke's (1997) model of the work motivation process and J. P. Meyer and L. Herscovitch's (2001) model of workplace commitments serve as the foundation for the development of this new framework. To facilitate the merger, a new concept, goal regulation, is derived from self-determination theory (E. L. Deci & R. M. Ryan, 1985) and regulatory focus theory (E. I. Higgins, 1997). By including goal regulation, it is acknowledged that motivated behavior can be accompanied by different mindsets that have particularly important implications for the explanation and prediction of discretionary work behavior.  相似文献   
157.
Mapping of arbitrary color cues onto object properties such as mass can influence the control of fingertip forces. One can view the development of that mapping as a motor learning issue, and its development should therefore be influenced by practice schedule. During an acquisition phase, 24 participants lifted color-cued objects that differed in mass. The masses were presented in either blocked or random orders. A test phase consisted of lifts of a midmass object; on some lifts, the object's mass was unexpectedly changed. The change was either accurately color cued or miscued. Only blocked practice led to visually mediated scaling of fingertip forces to object mass. During the test phase, previous blocked practice resulted in reliance on visual cues, and random practice led to a reliance on haptics (sense of touch). Those findings suggest that the integration of arbitrary color cues and haptic information is dependent on practice conditions.  相似文献   
158.
159.
In this study, the factor structure and psychometric properties of a French adaptation of the well-established Loneliness and Aloneness Scale for Children and Adolescents (LACA) was investigated in a French-speaking sample of Belgian adolescents (N?=?641; Mage?=?14.35, SD?=?2.03; 53.4% girls). In addition, measurement invariance analyses across the two main language groups in Belgium (i.e., Dutch-speaking and French-speaking) and across age and gender were conducted on a combined sample of French-speaking and Dutch-speaking Belgian adolescents (N?=?1282; Mage?=?14.36 years, SD?=?2.03; 53.6% female). Subsequently, group mean differences across language, age, and gender groups were investigated. Convincing support was found for the expected four-factor structure of the French adaptation of the LACA and the measure showed good reliability. Results further indicated that Belgian adolescents from the two principal language groups and from different age and gender groups interpreted the items of the LACA similarly. Therefore, analyses of group mean differences could be compared. Given the small effect sizes that accompanied the obtained effects, replication research is needed to further investigate these group mean differences.  相似文献   
160.
This study is aimed at investigating perceived task interdependence and team size as contingencies for team leaders’ transformational leadership influence on team identification. Data were obtained from a two-phase survey among 234 employees from ten multinational pharmaceutical subsidiaries in South Korea. Each dimension of transformational leadership by team leaders relates positively to team identification. However, the impact of leadership dimensions on team identification is attenuated by distinct moderator(s): charisma by higher perceived task interdependence, individualized consideration by larger team size, and intellectual stimulation by higher perceived task interdependence or larger team size. This study’s findings help us develop a more nuanced understanding of how transformational leadership operates. This study illustrates that team leaders’ transformational influence on team identification fluctuates, depending on the team structure. Such knowledge may help inform team leader development and team-structuring strategies used by practitioners and may contribute to improving organizational team effectiveness. This is one of the first studies showing evidence that the influence of the dimensions of transformational leadership is contingent upon distinct moderators, thereby contributing to advancing the theory of transformational leadership. Further, this study, by investigating team structure as a contingency of the transformational leadership-team identification relationship, complements previous research that focused on follower characteristics. Additionally, our explicit attention to the team as both the context of leaders’ action and the target of employee identification helps us gain a more concrete understanding of team leadership and team development issues, which are particularly salient in the highly competitive pharmaceutical industry.  相似文献   
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