全文获取类型
收费全文 | 26775篇 |
免费 | 1102篇 |
国内免费 | 13篇 |
专业分类
27890篇 |
出版年
2020年 | 277篇 |
2019年 | 366篇 |
2018年 | 513篇 |
2017年 | 528篇 |
2016年 | 556篇 |
2015年 | 429篇 |
2014年 | 487篇 |
2013年 | 2299篇 |
2012年 | 820篇 |
2011年 | 880篇 |
2010年 | 535篇 |
2009年 | 521篇 |
2008年 | 709篇 |
2007年 | 754篇 |
2006年 | 628篇 |
2005年 | 611篇 |
2004年 | 564篇 |
2003年 | 551篇 |
2002年 | 593篇 |
2001年 | 857篇 |
2000年 | 794篇 |
1999年 | 625篇 |
1998年 | 285篇 |
1997年 | 252篇 |
1996年 | 287篇 |
1995年 | 255篇 |
1992年 | 511篇 |
1991年 | 506篇 |
1990年 | 475篇 |
1989年 | 454篇 |
1988年 | 462篇 |
1987年 | 426篇 |
1986年 | 436篇 |
1985年 | 434篇 |
1984年 | 353篇 |
1983年 | 310篇 |
1982年 | 255篇 |
1979年 | 395篇 |
1978年 | 286篇 |
1977年 | 242篇 |
1975年 | 315篇 |
1974年 | 386篇 |
1973年 | 396篇 |
1972年 | 317篇 |
1971年 | 307篇 |
1970年 | 320篇 |
1969年 | 273篇 |
1968年 | 380篇 |
1967年 | 343篇 |
1966年 | 311篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
992.
This report details the reliability of perceived parental and childhood illness behavior. Three versions of the Illness Behavior Inventory were created to assess perceived illness behavior of one's mother, father, and oneself as a child. The measures were administered twice to 32 students of linguistics at a major university with a 2-wk. interval between administrations. Each measure across administrations correlated highly and significantly (.98 to .99). It was concluded that perceptions of parental and childhood illness behavior are reliable over time but their sensitivity to actual historical events remains an empirical question. 相似文献
993.
9 obese and 9 normal subjects performed a psychophysical task in which food- or non-food-related stimuli were briefly flashed tachistoscopically at a speed and intensity near the visual threshold. A signal was presented on one-half the trials and noise only on the other one-half of the trials. Using signal detection theory methodology, separate measures of sensory sensitivity (d') and response bias (beta) were calculated. No differences were noted between obese and normal subjects on measures of sensory sensitivity but significant differences on response bias. Obese subjects had consistently lower response criteria than normal ones. Analysis for subjects categorized by whether they were restrained or unrestrained eaters gave findings identical to those for obese and normal. The importance of using a methodology that separates sensory and non-sensory factors in research on obesity is discussed. 相似文献
994.
R B Cairns D J MacCombie K E Hood 《Journal of comparative psychology (Washington, D.C. : 1983)》1983,97(1):69-89
In order to investigate the proposal that modifications in developmental rate may mediate differences in aggressive behavior, two series of selective breeding studies were completed. Stable lines of mice that differed in the frequency and latency of attacks were rapidly established in two series (by S1 in the first series and S3 or S4 in the second series). For evaluation of the developmental-genetic proposal, an analysis was made of the ontogeny of aggressive expression in male mice of the two series, with a detailed report provided of the S1 and S4 generations of the second breeding series. Comparisons between the results of a longitudinal design and the results of a new type of cross-sectional design (involving only siblings, or co-sibial) indicated (a) a reliable developmental course of attack expression, with a sharp rise in early maturity and a slow decline thereafter; (b) a convergence in later maturity of the behavior of lines selectively bred for high or low aggressive behavior, if the animals had been assigned to the longitudinal design; (c) a strong effect of repeated testing on attack latency and frequency, even though the dyadic tests were brief in duration and separated by long intervals. In addition, cross-generational comparisons suggested that the selective breeding differences came about primarily by changes in the behavior of the low aggressive lines, in that these animals failed to show in early maturity the sharp increases in attack occurrence that were observed in earlier generations. Certain implications of these findings for developmental and evolutionary concepts (e.g., neoteny, acceleration, heterochrony) are discussed. 相似文献
995.
Kenneth L. Lichstein Timothy J. Hoelscher Terry L. Eakin Rene Nickel 《Journal of psychopathology and behavioral assessment》1983,5(2):111-118
We have previously reported on a sleep assessment device (SAD) that addresses shortcomings inherent in self-report sleep data and polysomnography. The SAD produces a sleep record by tape recording subjects' verbal responses to auditory cues spaced at fixed intervals throughout the night. In prior studies, the SAD proved to be a reliable and valid assessment tool according to electroencephalographic comparisons. Herein, we report on the unassisted home use of the SAD by eight normal volunteers and four bedmates. Subjects and bedmates completed sleep questionnaires for 12 nights and subjects also employed the SAD the last 6 nights. Comparisons of subjects and bedmates self-report sleep data before and during SAD use indicated that the SAD did not disrupt sleep. Subjects were able to self-administer successfully the SAD in their homes. SAD data closely matched subjects' self-report data. The present study found the SAD to be an accurate, unobtrusive, and easily utilized empirical measure of sleep in the natural environment. In so doing, it extends the demonstrated reliability and validity of the SAD from the sleep laboratory to the home with normal sleepers. 相似文献
996.
Patricia B. Sutker Charles E. Moan Albert N. Allain 《Journal of psychopathology and behavioral assessment》1983,5(4):275-287
It has been suggested that psychopaths exhibit specific deficits in cognitive processes associated with frontal lobe functioning. There is also evidence which indicates that level of intelligence may influence expression of impulse control among psychopaths. The present study investigated these hypotheses by comparing groups of 44 psychopaths and 14 normal controls selected from a sample of incarcerated male felons using Minnesota Multiphasic Personality Inventory (MMPI)-defined criteria. Dependent variables included several measures of cognitive flexibility, perseveration, and impulsiveness. Compared to normal controls, psychopaths showed no greater tendencies to persist in incorrect responding, disregard cues suggesting the need to modify behaviors, or proceed impulsively in problem solving. Level of intelligence was found to be a moderator variable influencing performance for psychopaths and normal controls. Results suggest that deficits in cognitive functioning are not necessarily characteristic of psychopaths across situations. 相似文献
997.
Patricia B. Sutker Albert N. Allain Jr. 《Journal of psychopathology and behavioral assessment》1983,5(1):65-79
Few efforts have been made to understand antisocial-prone individuals who maintain adaptive functioning. This study identified a sample of potentially deviant but adaptively functioning persons to determine whether they differed significantly from their more conforming peers. A small sample of men was selected by Minnesota Multiphasic Personality Inventory (MMPI)-defined criteria for sociopathy and compared with MMPI-defined normals of similar ages, backgrounds, and intelligence. Response variables were those cited in the literature as characteristic of sociopathic psychopathology and included measures of abilities to plan ahead and inhibit impulsiveness, sensation seeking, interpersonal performance and style, and behavior conformity. Men labeled adaptive sociopaths showed greater impulsiveness and needs for experience seeking, earned lower scores on measures of socialization and self-control, and admitted greater adolescent behavior deviance. They were not shown to be less empathetic or less able to relate interpersonally in interview. The potential role of socially constructive self-determined goals and tangible vocational rewards as mediators of adaptive behavior are discussed in terms of overcoming antisocial tendencies and attenuation of behavior disinhibition. 相似文献
998.
An adaptive psychometric procedure that places each trial at the current most probable Bayesian estimate of threshold is described. The procedure takes advantage of the common finding that the human psychometric function is invariant in form when expressed as a function of log intensity. The procedure is simple, fast, and efficient, and may be easily implemented on any computer. 相似文献
999.
Cynthia L. McClaskey David B. Pisoni Thomas D. Carrell 《Attention, perception & psychophysics》1983,34(4):323-330
The present study examined the plasticity of the human perceptual system by means of laboratory training procedures designed to modify the perception of the voicing dimension in synthetic speech stimuli. Although the results of earlier laboratory training studies have been ambiguous, recently Pisoni, Aslin, Perey, and Hennessy (1982) have succeeded in altering the perception of labial stop consonants from a two-way contrast in voicing to a three-way contrast. The present study extended these initial results by demonstrating that experience gained from discrimination training on one place of articulation (e.g., labial) can be transferred to another place of articulation (e.g., alveolar) without any additional training on the specific test stimuli. Quantitative analyses of the identification functions showed that the new perceptual categories were stable and displayed well-defined labeling boundaries between categories. Taken together with the earlier findings, these results imply a greater degree of plasticity in the adult speech processing system than has generally been acknowledged in past studies. 相似文献
1000.
David M. Green Albert F. Smith Susanne M. von Gierke 《Attention, perception & psychophysics》1983,34(3):195-208
Choice reaction latencies were measured at three different a priori probabilities for two stimulus alternatives. Unlike the results of some other studies, the mean latency of a given response was nearly the same whether the response was correct or incorrect. The discriminable stimuli were a 1000- or a 1700-Hz tone presented at 70 dB SPL. Latencies and standard deviations, based on about 17,000 observations, are reported for three observers. The data are compared with predictions of the optimum sequential model of Wald and Stone and two modifications of that random-walk model, one proposed by Link and Heath and the other proposed by Laming. Fast-guess analyses were also carried out. The three-parameter version of either the sequential or the modified random-walk models provided reasonably accurate predictions of the mean data for each observer. The parameters estimated by the fast-guess analysis were unrealistic. There are three obvious differences between this experiment and most previous choice reaction-time experiments. First is stimulus modality#x2014;we used an auditory signal, whereas most of the previous studies used a visual signal. Second, the observers practiced more in this experiment than in most previous experiments. Finally, there was a random foreperiod with a heavy penalty for anticipations. One or more of these factors is the probable reason for the discrepancy between our results and those of previous studies. 相似文献