全文获取类型
收费全文 | 1597篇 |
免费 | 45篇 |
国内免费 | 1篇 |
专业分类
1643篇 |
出版年
2020年 | 22篇 |
2019年 | 19篇 |
2018年 | 24篇 |
2017年 | 29篇 |
2016年 | 27篇 |
2015年 | 26篇 |
2014年 | 32篇 |
2013年 | 148篇 |
2012年 | 66篇 |
2011年 | 55篇 |
2010年 | 41篇 |
2009年 | 37篇 |
2008年 | 57篇 |
2007年 | 72篇 |
2006年 | 52篇 |
2005年 | 59篇 |
2004年 | 68篇 |
2003年 | 59篇 |
2002年 | 56篇 |
2001年 | 28篇 |
2000年 | 22篇 |
1999年 | 23篇 |
1998年 | 23篇 |
1997年 | 20篇 |
1996年 | 26篇 |
1995年 | 20篇 |
1994年 | 26篇 |
1993年 | 27篇 |
1992年 | 21篇 |
1991年 | 20篇 |
1990年 | 32篇 |
1989年 | 16篇 |
1988年 | 9篇 |
1987年 | 14篇 |
1986年 | 18篇 |
1985年 | 26篇 |
1984年 | 29篇 |
1983年 | 20篇 |
1982年 | 23篇 |
1981年 | 26篇 |
1980年 | 25篇 |
1979年 | 20篇 |
1978年 | 30篇 |
1977年 | 18篇 |
1976年 | 20篇 |
1975年 | 22篇 |
1974年 | 25篇 |
1973年 | 16篇 |
1972年 | 11篇 |
1971年 | 9篇 |
排序方式: 共有1643条查询结果,搜索用时 15 毫秒
881.
Similarity and categorization of environmental sounds 总被引:1,自引:0,他引:1
Four experiments investigated the acoustical correlates of similarity and categorization judgments of environmental sounds. In Experiment 1, similarity ratings were obtained from pairwise comparisons of recordings of 50 environmental sounds. A three-dimensional multidimensional scaling (MDS) solution showed three distinct clusterings of the sounds, which included harmonic sounds, discrete impact sounds, and continuous sounds. Furthermore, sounds from similar sources tended to be in close proximity to each other in the MDS space. The orderings of the sounds on the individual dimensions of the solution were well predicted by linear combinations of acoustic variables, such as harmonicity, amount of silence, and modulation depth. The orderings of sounds also correlated significantly with MDS solutions for similarity ratings of imagined sounds and for imagined sources of sounds, obtained in Experiments 2 and 3--as was the case for free categorization of the 50 sounds (Experiment 4)--although the categorization data were less well predicted by acoustic features than were the similarity data. 相似文献
882.
The participants were 40 students who were briefly presented 32 dot locations, one at a time, and attempted to reproduce each
location after a short delay. Half of the participants completed the task with the surrounding shapes being a circle, a horizontal
ellipse, and a vertical ellipse; for the other half, the surrounding shapes were a square, a triangle, and a pentagon. Elongation
of the task field along an axis led to exaggerated bias along that axis, but the pattern of bias was fairly constant across
the shapes. The data were modeled by assuming that bias in estimation was due to the weighting of spatial category prototypes.
Modeling indicated that shape affected spacing of prototypes, but there was no evidence that it affected the number of prototypes.
These results were consistent with use of a viewer-based frame of reference, with prototypes reflecting four spatial quadrants
generated by left—right and up—down distinctions from the viewer’s perspective. 相似文献
883.
The nonword repetition (NWR) test has been shown to be a good predictor of children's vocabulary size. NWR performance has been explained using phonological working memory, which is seen as a critical component in the learning of new words. However, no detailed specification of the link between phonological working memory and long-term memory (LTM) has been proposed. In this paper, we present a computational model of children's vocabulary acquisition (EPAM-VOC) that specifies how phonological working memory and LTM interact. The model learns phoneme sequences, which are stored in LTM and mediate how much information can be held in working memory. The model's behaviour is compared with that of children in a new study of NWR, conducted in order to ensure the same nonword stimuli and methodology across ages. EPAM-VOC shows a pattern of results similar to that of children: performance is better for shorter nonwords and for wordlike nonwords, and performance improves with age. EPAM-VOC also simulates the superior performance for single consonant nonwords over clustered consonant nonwords found in previous NWR studies. EPAM-VOC provides a simple and elegant computational account of some of the key processes involved in the learning of new words: it specifies how phonological working memory and LTM interact; makes testable predictions; and suggests that developmental changes in NWR performance may reflect differences in the amount of information that has been encoded in LTM rather than developmental changes in working memory capacity. 相似文献
884.
Researchers have manipulated text comprehension by creating texts that require a title to be understood, butthe source of the comprehension deficit has not been fully examined. We created comprehension quizzes for these texts that measure the surface form, textbase, and situation model. In three experiments, participants read passages with or without a title and then answered quiz questions. Results showed that the absence of a title influenced theaccuracy rate of answering situation model questions more than answering surface form or textbase questions. This suggests that the situation model is the primary source o f difficulty for these texts. These passages and quizzes can beused in future research that requires controlled manipulation and measurement of situation level comprehension. 相似文献
885.
ABSTRACT— Three studies examined automatic associations between words with moral and immoral meanings and the colors black and white. The speed of color naming in a Stroop task was faster when words in black concerned immorality (e.g., greed ), rather than morality, and when words in white concerned morality (e.g., honesty ), rather than immorality. In addition, priming immorality by having participants hand-copy an unethical statement speeded identification of words in the black font. Making immorality salient in this way also increased the moral Stroop effect among participants who had not previously shown it. In the final study, participants also rated consumer products. Moral meanings interfered with color naming most strongly among those participants who rated personal cleaning products as especially desirable. The moderation of the moral Stroop effect by individual differences in concerns about personal cleanliness suggests that ideas about purity and pollution are central to seeing morality in black and white. 相似文献
886.
Jonathan A. Farrimond Andrew J. Hill Nicholas A. Jones Gary J. Stephens Benjamin J. Whalley Claire M. Williams 《Behavior research methods》2009,41(2):446-451
We have designed and implemented a low-cost digital system using closed-circuit television cameras coupled to a digital acquisition
system for the recording of in vivo behavioral data in rodents and for allowing observation and recording of more than 10
animals simultaneously at a reduced cost, as compared with commercially available solutions. This system has been validated
using two experimental rodent models: one involving chemically induced seizures and one assessing appetite and feeding. We
present observational results showing comparable or improved levels of accuracy and observer consistency between this new
system and traditional methods in these experimental models, discuss advantages of the presented system over conventional
analog systems and commercially available digital systems, and propose possible extensions to the system and applications
to nonrodent studies. 相似文献
887.
David B. Bellinger Bradley M. Budde Moe Machida Gary B. Richardson William P. Berg 《Transportation Research Part F: Traffic Psychology and Behaviour》2009,12(6):441-451
Driver distraction contributes to vehicle accidents, with estimates as high as one-half of crashes being distraction-related. The purpose of this experiment was to explore potential distractions by testing the effects of cellular telephone conversation and music listening on response time and its subcomponents of reaction time (RT) and movement time (MT) in a simulated braking task. Participants (N = 27) sat at a simulated driving station and released the accelerator and depressed the brake pedal as quickly as possible following activation of a simulated brake lamp. The braking task was performed under each of six conditions including: (a) the control (braking task only); (b) music playing at 66 dBA; (c) music playing at 78 dBA; (d) cellular telephone conversation; (e) cellular telephone conversation and music at 66 dBA; and (f) cellular telephone conversation and music at 78 dBA. Cellular telephone conversation slowed response time, yet music had no effect on response time. While the RT results generally mirrored those of response time (i.e., RT was also slowed by the telephone conversation), interestingly, MT was actually faster when the cellular telephone conversation was present compared to when it was not. Participants appear to have anticipated slower RT in the presence of the cellular telephone conversation, and attempted to compensate by executing a more rapid movement to the brake pedal. 相似文献
888.
Eric A. Storch Heather Lehmkuhl Steven L. Pence Jr. Gary R. Geffken Emily Ricketts Jill F. Storch Tanya K. Murphy 《Journal of child and family studies》2009,18(3):249-258
We examined parental experience of having a child with obsessive-compulsive disorder (OCD) in 62 parent–child dyads. Youth
with a primary diagnosis of OCD and their parent(s) were administered the CY-BOCS jointly by a trained clinician. Parents
completed several measures about their child’s OCD-related impairment and accommodation, emotional and behavioral functioning,
parental distress, caregiver stress, and parental experiences of having a child with OCD. Results indicated that parents of
children with OCD are considerably distressed about their child’s condition. As expected, negative parental experiences (e.g.,
anxiety about child’s condition, uncertainty about their future) were directly related to OCD symptom severity and impairment,
as well as child internalizing and externalizing problems, family accommodation of symptoms, and caregiver strain. The presence
of emotional resources was negatively related to most outcomes, although some of these relationships did not achieve statistical
significance. The presence of internalizing symptoms mediated the relationship between parental experiences and parental distress.
Given these findings, addressing parental experiences as part of a family based cognitive-behavioral treatment program for
pediatric OCD may help reduce parental distress and improve patient prognosis. 相似文献
889.
David J. Kelly Shaoying Liu Paul C. Quinn Alan M. Slater 《Journal of experimental child psychology》2009,104(1):105-114
The other-race effect in face processing develops within the first year of life in Caucasian infants. It is currently unknown whether the developmental trajectory observed in Caucasian infants can be extended to other cultures. This is an important issue to investigate because recent findings from cross-cultural psychology have suggested that individuals from Eastern and Western backgrounds tend to perceive the world in fundamentally different ways. To this end, the current study investigated 3-, 6-, and 9-month-old Chinese infants’ ability to discriminate faces within their own racial group and within two other racial groups (African and Caucasian). The 3-month-olds demonstrated recognition in all conditions, whereas the 6-month-olds recognized Chinese faces and displayed marginal recognition for Caucasian faces but did not recognize African faces. The 9-month-olds’ recognition was limited to Chinese faces. This pattern of development is consistent with the perceptual narrowing hypothesis that our perceptual systems are shaped by experience to be optimally sensitive to stimuli most commonly encountered in one’s unique cultural environment. 相似文献
890.