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981.
Most birds rely on imprinting and experience with conspecifics to learn species-specific recognition cues. Australian brush-turkeys
(Alectura lathami) do not imprint and form no bonds with parents. They hatch asynchronously, disperse widely and meet juvenile conspecifics
at an unpredictable age. Nevertheless, in captivity, hatchlings respond to other chicks. A recent study, which involved the
use of robotic models, found that chicks prefer to approach robots that emit specific visual cues. Here, we evaluated their
response to acoustic cues, which usually play an important role in avian social cognition. However, in simultaneous choice
tests, neither 2-day-old nor 9-day-old chicks preferred the choice arm with playback of either chick or adult conspecific
calls over the arm containing a silent loudspeaker. Chicks of both age classes, however, scanned their surroundings more during
chick playback, and the response was thus consistent in younger and older chicks. We also presented the chicks with robotic
models, either with or without playback of chick calls. They did not approach the calling robot more than they did the silent
robot, indicating that the combination of visual and acoustic cues does not evoke a stronger response. These results will
allow further comparison with species that face similar cognitive demands in the wild, such as brood parasites. Such a comparative
approach, which is the focus of cognitive ecology, will enable us to further analyse the evolution and adaptive value of species
recognition abilities. 相似文献
982.
This study evaluated factors related to the perceptual disturbances of body image. Using a digital body image computer program, 191 participants (107 women, 82 men) adjusted an image of their body to the perceived actual size at five body regions; chest, waist, hips, thighs and calves. A neutral object (a vase) was also adjusted to partial out the level of perceptual distortion present with a neutral object. Men and women overestimated the size of the neutral object and their body image. Among women, overestimation was primarily predicted by high levels of depression, and media and peer influences to be thinner and increase muscles. Among men, overestimation was predicted by high BMI, media influences to lose weight and increase muscles, and peer influences to increase muscles. These findings suggest that perceptual accuracy of body image is primarily predicted by biopsychosocial influences. 相似文献
983.
Grindstaff TL Christiano KE Broos AM Straub DA Darr NS Westphal KA 《Perceptual and motor skills》2006,102(2):379-386
This study assessed whether a practice effect occurs across five serial administrations of the sensory organization test. Composite equilibrium scores and mean equilibrium scores from 30 healthy volunteers (M age=36.9, SD = 12.2 yr.) performing each of the six test conditions were examined using a two-way repeated-measures analysis of variance. Analysis yielded a significant interaction between testing condition and time, as well as significant main effects for both condition and time. Pairwise comparisons showed significant differences among test conditions and the first and second times of test administration. Analysis of simple effects between the two administrations identified significant increases in composite equilibrium scores and mean equilibrium scores on two sway-referenced support surface conditions, vision removed and sway-referenced visual surround. An immediate increase in equilibrium scores suggests clinicians and researchers allow one pracatice trial before recording test scores for baseline measurements. 相似文献
984.
Many environmental problems are resource dilemmas that contain two components-social and temporal-that encourage individuals not to act in the best interest of the group. Most research has focused on the social component. The authors examined the importance of the temporal component in two resource dilemma tasks. Participants (N = 112) reported their willingness to limit resource consumption in response to hypothetical dilemmas and forfeited extra credit points in response to a real dilemma. Cooperation rates were higher when the temporal dilemma was diminished, when uncertainty about environmental impacts was low, and for women. Individuals high in both proenvironmentalism and consideration of future consequences sustained high levels of cooperation even in the face of strong temporal dilemmas. 相似文献
985.
Carnelley KB Wortman CB Bolger N Burke CT 《Journal of personality and social psychology》2006,91(3):476-492
Most studies of widowhood have focused on reactions during the first few years postloss. The authors investigated whether widowhood had more enduring effects using a nationally representative U.S. sample. Participants were 768 individuals who had lost their spouse (from a few months to 64 years) prior to data collection. Results indicated that the widowed continued to talk, think, and feel emotions about their lost spouse decades later. Twenty years postloss, the widowed thought about their spouse once every week or 2 and had a conversation about their spouse once a month on average. About 12.6 years postloss, the widowed reported feeling upset between sometimes and rarely when they thought about their spouse. These findings add to an understanding of the time course of grief. 相似文献
986.
Blankenship V Vega CM Ramos E Romero K Warren K Keenan K Rosenow V Vasquez J Sullivan A 《Journal of personality assessment》2006,86(1):100-114
We used the Rasch (1980) model to develop new pictures for the Thematic Apperception Test (C. D. Morgan & Murray, 1938; McClelland, Atkinson, Clark, & Lowell, 1953) or picture story exercise to measure need for achievement (nAch). In Experiments 1 and 2, we analyzed stories to assess the difficulty level of a total of 8 pictures using the multifaceted Rasch model with picture difficulty, story probe difficulty, and participant ability as facets with a partial credit model (FACETS; Linacre, 2005). A total of 6 pictures were retained and 4 new ones added for Experiment 3 in which 201 participants wrote 6 stories to a random set of the 10 pictures. FACETS analysis revealed improved person separation reliability. In Experiment 4, 206 participants wrote 1 story to the Studying picture either before or after filling out a battery of achievement-related questionnaires. The 2 experimental groups did not differ in the amount of nAch in their stories. The coder facet was demonstrated with 2 independent coders using the revised coding system for nAch. 相似文献
987.
12 nondemented patients with Parkinson's disease (M age = 67.3) and 12 normal control participants were administered an object-based attention task that enabled examination of both negative and positive priming. Unlike previous studies in which spatial-based attention tasks were used, results of the present study indicated that the patients displayed negative and positive priming not different from those shown by controls. These results suggest that certain object-based attentional processes may not be impaired in patients with Parkinson's disease. 相似文献
988.
Tremblay S Parmentier FB Guérard K Nicholls AP Jones DM 《Journal of experimental psychology. Learning, memory, and cognition》2006,32(5):1208-1215
In 2 experiments, the authors tested whether the classical modality effect-that is, the stronger recency effect for auditory items relative to visual items-can be extended to the spatial domain. An order reconstruction task was undertaken with four types of material: visual-spatial, auditory-spatial, visual-verbal, and auditory-verbal. Similar serial position curves were obtained regardless of the nature of the to-be-remembered sequences, with the exception that a modality effect was found with spatial as well as with verbal materials. The results are discussed with regard to a number of models of short-term memory. 相似文献
989.
Self-reported reasons for suicide attempts and nonsuicidal self-injury were examined using the Parasuicide History Interview within a sample of chronically suicidal women meeting criteria for borderline personality disorder (N = 75). Overall, reasons given for suicide attempts differed from reasons for nonsuicidal self-injury. Nonsuicidal acts were more often reported as intended to express anger, punish oneself, generate normal feelings, and distract oneself, whereas suicide attempts were more often reported as intended to make others better off. Almost all participants reported that both types of parasuicide were intended to relieve negative emotions. It is likely that suicidal and nonsuicidal parasuicide have multiple intents and functions. 相似文献
990.
Hoch H McComas JJ Johnson L Faranda N Guenther SL 《Journal of applied behavior analysis》2002,35(2):171-181
Three boys with autism participated in a study of the effects of magnitude and quality of reinforcement on choice responding. Two concurrent response alternatives were arranged: (a) to play in an area where a peer or sibling was located, or (b) to play in an area where there was no peer or sibling. During one condition, the magnitude (i.e., duration of access to toys) or quality (level of preference) of reinforcement provided for both responses was equal. During the other condition, the magnitude or quality of reinforcement was relatively greater for choosing the play area where the peer or sibling was located than the area where the peer or sibling was not located. Results showed that after repeated exposure to the unequal magnitude or quality condition, the participant increasingly allocated his responses to the play area where the peer or sibling was located. For 2 participants, this pattern of responding was maintained in the subsequent equal magnitude or quality condition. Overall, the analysis suggests that the dimensions of magnitude and quality of reinforcement can be arranged to influence choice responding in favor of playing near a peer or sibling rather than playing alone. 相似文献