全文获取类型
收费全文 | 59807篇 |
免费 | 1604篇 |
国内免费 | 27篇 |
出版年
2020年 | 423篇 |
2019年 | 544篇 |
2018年 | 4019篇 |
2017年 | 3354篇 |
2016年 | 2952篇 |
2015年 | 745篇 |
2014年 | 762篇 |
2013年 | 3478篇 |
2012年 | 1819篇 |
2011年 | 3540篇 |
2010年 | 3189篇 |
2009年 | 2284篇 |
2008年 | 2754篇 |
2007年 | 3240篇 |
2006年 | 1121篇 |
2005年 | 1168篇 |
2004年 | 1086篇 |
2003年 | 998篇 |
2002年 | 983篇 |
2001年 | 1218篇 |
2000年 | 1252篇 |
1999年 | 930篇 |
1998年 | 498篇 |
1997年 | 458篇 |
1996年 | 442篇 |
1995年 | 445篇 |
1994年 | 415篇 |
1992年 | 760篇 |
1991年 | 705篇 |
1990年 | 666篇 |
1989年 | 648篇 |
1988年 | 639篇 |
1987年 | 592篇 |
1986年 | 597篇 |
1985年 | 653篇 |
1984年 | 567篇 |
1983年 | 535篇 |
1982年 | 460篇 |
1979年 | 586篇 |
1978年 | 478篇 |
1977年 | 437篇 |
1976年 | 453篇 |
1975年 | 492篇 |
1974年 | 568篇 |
1973年 | 587篇 |
1972年 | 495篇 |
1971年 | 405篇 |
1968年 | 478篇 |
1967年 | 412篇 |
1966年 | 405篇 |
排序方式: 共有10000条查询结果,搜索用时 205 毫秒
981.
Robert G. Webster 《Attention, perception & psychophysics》1969,6(1):33-38
The literature concerning adaptation to prism indicates that several adaptive mechanisms may be important. The particular mechanism or mechanisms involved depends (at least in part) upon the type of adaptive exposure. In the present study. three adaptive mechanisms (cognitive. oculomotor, and motor-kinesthetic) were investigated. Ss were asked to point in the dark at an illuminated target. The target was seen displaced from its veridical position due to a wedge prism placed before S’s right eye. The left eye was occluded. Ss then viewed their visual target pointing errors through the displacing prism without seeing any part of their bodies. One group of Ss was instructed to ignore these prism-induced errors and to continue pointing at the target’s visual position. A second group of Ss was instructed to compensate fully for their errors and to at tempt to eliminate them on all future trials. For the latter group errors were completely eliminated, while for Ss instructed to ignore their errors, relatively small improvement in visual target settings occurred. This improvement was called cognitive adaptation, since it depended on the S’s conscious control. In addition. for both conditions. evidence was found that allowing Ss to view their prism-induced pointing errors resulted in some form of motor-kinesthetic adaptation. This adaptation was hypothesized to represent a change in the judged position of the pointing hand relative to its felt position. It was concluded that this motor-kinesthetic adaptation was dependent, in part, upon cognitive information concerning the effects of the prism and that it serves to reduce conflict between cognitive and visual cues, i.e., between what S believes and what he sees. 相似文献
982.
Nine Ss made half-judgments of each of nine brightness standards. Individual half-judgment brightness functions were constructed, one for each of the two threshold forms of the power law. The ω-Law (translation on the psychological axis) provided a better fit to the half-judgment data than did the ?-Law (translation on the intensity axis). A test of scale consistency for the fractionation method was confounded with the power law hypothesis, but the data are interpreted as providing fair support for the method independent of the form of the power law. The effect of Standard on exponent estimates was significant for both forms of the law, and the effect of Standard on threshold estimates was significant for the ?-Law but not for the ω-Law. Both forms of the law contain a so-called threshold parameter, but the interpretation of this parameter as a threshold was rejected for the ?-Law and accepted for the ω-Law. 相似文献
983.
C. R. Ingils 《Journal of counseling and development : JCD》1968,46(8):744-748
In our society an increasingly greater emphasis is being placed on group interaction and decision-making. Persons participating in such a process often use the term “group dynamics” to describe what is thought to be a social-psychological phenomenon. This article discusses some of the elements of “true” group characteristics and effects, and their possible existence in “group dynamic” situations. The article also deals with the implications of the effects of these elements in “group dynamic” environments on educational and administrative leadership and decision-making. 相似文献
984.
985.
986.
Four pigeons were exposed to a two-key DRL procedure. At the start of a trial, key A was illuminated. A response to the lighted key turned it off and simultaneously illuminated key B. Reinforcement was available for responses on key B which followed the initial key A response by more than 2 sec. In the course of exposure to these conditions, all birds acquired superstitious response chains on key A. The distribution of the number of responses on key A preceding a key B response and the distribution of intervals elapsing from the initial key A response to the key B response were of the same form. The suggestion is made that the superstitious responding on key A served to mediate the required delay interval. However, when intervals between successive key A responses were recorded for one subject, they were found to be regularly spaced in time. Thus, the problem remains of how this behavior is itself timed. 相似文献
987.
Roger T. Kelleher William C. Riddle Leonard Cook 《Journal of the experimental analysis of behavior》1963,6(4):507-517
Squirrel monkeys were trained on a multiple schedule in which 10-min periods on a continuous shock avoidance schedule, indicated by a yellow light, alternated with 10-min periods on a 1.5-min variable interval schedule of food reinforcement (VI 1.5). A white light indicated that VI 1.5 was in effect, except for the middle 2 min of the period on VI 1.5, in which a blue light appeared and terminated with the delivery of a 0.5-sec unavoidable shock. Stable response rates developed in the avoidance and VI 1.5 components. However, the highest response rates occurred in the blue, preshock stimulus. A series of experiments showed that responding in the blue stimulus persisted even when responding had been extinguished on both the VI schedule of food reinforcement and the shock avoidance schedule. Responding in the blue stimulus ceased when the blue stimulus terminated without shock or when it terminated with a response-contingent shock. Each time responding ceased, it was restored by terminating the blue stimulus with an unavoidable shock. When the blue stimulus was on throughout each session and unavoidable shocks were delivered at regular 10-min intervals, responding was well maintained. These results show that in monkeys that have been trained on a continuous avoidance schedule, unavoidable shocks can maintain responding even under conditions where responses have no programmed consequences. 相似文献
988.
989.
990.