全文获取类型
收费全文 | 723篇 |
免费 | 330篇 |
国内免费 | 49篇 |
出版年
2024年 | 1篇 |
2023年 | 19篇 |
2022年 | 12篇 |
2021年 | 21篇 |
2020年 | 48篇 |
2019年 | 50篇 |
2018年 | 47篇 |
2017年 | 44篇 |
2016年 | 42篇 |
2015年 | 38篇 |
2014年 | 31篇 |
2013年 | 82篇 |
2012年 | 35篇 |
2011年 | 33篇 |
2010年 | 24篇 |
2009年 | 37篇 |
2008年 | 29篇 |
2007年 | 30篇 |
2006年 | 38篇 |
2005年 | 42篇 |
2004年 | 20篇 |
2003年 | 29篇 |
2002年 | 37篇 |
2001年 | 14篇 |
2000年 | 24篇 |
1999年 | 16篇 |
1998年 | 15篇 |
1997年 | 14篇 |
1996年 | 11篇 |
1995年 | 12篇 |
1994年 | 12篇 |
1993年 | 22篇 |
1992年 | 13篇 |
1991年 | 13篇 |
1990年 | 7篇 |
1989年 | 11篇 |
1988年 | 10篇 |
1987年 | 10篇 |
1986年 | 5篇 |
1985年 | 8篇 |
1984年 | 10篇 |
1983年 | 9篇 |
1982年 | 14篇 |
1981年 | 5篇 |
1980年 | 9篇 |
1979年 | 13篇 |
1978年 | 10篇 |
1977年 | 11篇 |
1976年 | 6篇 |
1975年 | 9篇 |
排序方式: 共有1102条查询结果,搜索用时 15 毫秒
61.
Simultaneous visual discrimination in Asian elephants 总被引:3,自引:0,他引:3
Nissani M Hoefler-Nissani D Lay UT Htun UW 《Journal of the experimental analysis of behavior》2005,83(1):15-29
Two experiments explored the behavior of 20 Asian elephants (Elephas aximus) in simultaneous visual discrimination tasks. In Experiment 1, 7 Burmese logging elephants acquired a white+/black- discrimination, reaching criterion in a mean of 2.6 sessions and 117 discrete trials, whereas 4 elephants acquired a black+/white- discrimination in 5.3 sessions and 293 trials. One elephant failed to reach criterion in the white+/black- task in 9 sessions and 549 trials, and 2 elephants failed to reach criterion in the black+/white- task in 9 sessions and 452 trials. In Experiment 2, 3 elephants learned a large/small transposition problem, reaching criterion within a mean of 1.7 sessions and 58 trials. Four elephants failed to reach criterion in 4.8 sessions and 193 trials. Data from both the black/white and large/small discriminations showed a surprising age effect, suggesting that elephants beyond the age of 20 to 30 years either may be unable to acquire these visual discriminations or may require an inordinate number of trials to do so. Overall, our results cannot be readily reconciled with the widespread view that elephants possess exceptional intelligence. 相似文献
62.
The notion that non-human animals are capable of episodic memory is highly controversial. Here, we review recent behavioral work from our laboratory showing that the fundamental features of episodic memory can be observed in rats and that, as in humans, this capacity relies on the hippocampus. We also discuss electrophysiological evidence, from our laboratory and that of others, pointing to associative and sequential coding in hippocampal cells as potential neural mechanisms underlying episodic memory. 相似文献
63.
McArthur and Bishop (2004) found that people with specific language impairment (SLI) up to 14 years of age have poor behavioural frequency discrimination (FD) thresholds for 25-ms pure tones, while people with SLI upto 20 years of age have abnormal auditory N1--P2--N2 event-related potential (ERP) responses to the same tones. In the present study, we extended these findings to more complex non-speech and speech sounds by comparing younger (around 13 years) and older (around 17 years) teenagers with SLI and controls for their behavioural FD thresholds and N1-P2 ERPs to 25 and 250-ms pure tones, vowels, and non-harmonic complex tones. We found that a subgroup of people with SLI had abnormal responses to tones and vowels at the level of behaviour and the brain, and that poor processing was associated with the spectral complexity of auditory stimuli rather than their phonetic significance. We suggest that both the age of listeners and the sensitivity of psychoacoustic tasks to age-related changes in auditory skills may be crucial factors in studies of sound processing in SLI. 相似文献
64.
Bates BR 《Journal of genetic counseling》2005,14(6):423-434
Critics of genetic discourse are concerned that deterministic and discriminatory views of genetics are increasingly becoming
adopted. These views argue that current genetic discourse becomes a source of power whereby powerful institutions harm people
with so-called “bad” genes. This essay argues that current analyses of the power of genetics discourse are grounded in an
improper reading that disempowers patients. Deploying Michel Foucault's concept “care of the self,” this essay claims that
genetics discourse is better understood as a way that patients take on power through rhetoric rather than a force that has
power over patients. Through a close reading of the “My Family Health Portrait” program, this paper argues that patients experience
a process of “subjection” wherein they become agents of and objects of genetics discourse both. This alternative mode of analyzing
the power of genetics discourse has implications for our collective understanding of the operations of the care of the self
and the uses of genetic information that we propose. 相似文献
65.
Past studies of galliform anti-predator behavior show that they discriminate between aerial and ground predators, producing distinctive, functionally referential vocalizations to each class. Within the category of aerial predators, however, studies using overhead models, video images and observations of natural encounters with birds of prey report little evidence that galliforms discriminate between different raptor species. This pattern suggests that the aerial alarm response may be triggered by general features of objects moving in the air. To test whether these birds are also sensitive to more detailed differences between raptor species, adult chickens with young were presented with variously sized trained raptors (small, intermediate, large) under controlled conditions. In response to the small hawk, there was a decline in anti-predator aggression and in aerial alarm calling as the young grew older and less vulnerable to attack by a hawk of this size. During the same developmental period, responses to the largest hawk, which posed the smallest threat to the young at all stages, did not change; there were intermediate changes at this time in response to the middle-sized hawk. Thus the anti-predator behavior of the adult birds varied in an adaptive fashion, changing as a function of both chick age and risk. We discuss these results in light of current issues concerning the cognitive mechanisms underlying alarm calling behavior in animals. 相似文献
66.
Treichler FR 《Animal cognition》2005,8(2):75-83
Rhesus monkeys received concurrent within-session training on eight, two-choice object pairs and then underwent successive reversals of these problems. Initially, reversals required about six times more training than acquisition with no improvement over seven successive reversals. Surprisingly, performance on these eight problems was unimpaired if they were embedded in different eight-problem tasks, thereby indicating a release from proactive interference. When the original eight problems again underwent successive reversal, no improvement was seen over seven reversals, although there was significantly less error-per-reversal than in the initial test. Subsequently, monkeys appeared to be developing a learning set for successive reversal because performance on successive reversal of eight novel problems was not different from that seen with the old familiar task. Set acquisition was confirmed when proficient reversal was eventually achieved on both old and new concurrent tasks. Thus, concurrent reversal set did develop, but it required arduous training to overcome proactive interference effects on memory. The ubiquitous influence of measurement context on organization of monkey memory was noted. 相似文献
67.
The question of the morality of war is something of an embarrassment to liberal political thinkers. A philosophical tradition which aspires to found its preferred institutions in respect for individual autonomy, contract, and voluntary association, is naturally confronted by a phenomenon that is almost exclusively explained and justified in the language of States, force and territory. But the apparent difficulties involved in providing a convincing account of nature and ethics of war in terms of relations between individuals has not prevented liberal theorists from attempting this task. This paper examines a recent attempt by Igor Primoratz to sketch out the implications of a consistent liberalism for just war doctrine and, in particular, as regards the question of who may be a legitimate target of attack in wartime. Primoratz’s paper itself is a critique of Michael Waltzer’s authoritative exposition of just war theory for failing to be sufficiently and consistently liberal. The debate between these two authors is a productive site for investigating the potential and limitations of liberal theories of just war. 相似文献
68.
Lazareva OF Smirnova AA Bagozkaja MS Zorina ZA Rayevsky VV Wasserman EA 《Journal of the experimental analysis of behavior》2004,82(1):1-19
Eight crows were taught to discriminate overlapping pairs of visual stimuli (A+ B-, B+ C-, C+ D-, and D+ E-). For 4 birds, the stimuli were colored cards with a circle of the same color on the reverse side whose diameter decreased from A to E (ordered feedback group). These circles were made available for comparison to potentially help the crows order the stimuli along a physical dimension. For the other 4 birds, the circles corresponding to the colored cards had the same diameter (constant feedback group). In later testing, a novel choice pair (BD) was presented. Reinforcement history involving stimuli B and D was controlled so that the reinforcement/nonreinforcement ratios for the latter would be greater than for the former. If, during the BD test, the crows chose between stimuli according to these reinforcement/nonreinforcement ratios, then they should prefer D; if they chose according to the diameter of the feedback stimuli, then they should prefer B. In the ordered feedback group, the crows strongly preferred B over D; in the constant feedback group, the crows' choice did not differ significantly from chance. These results, plus simulations using associative models, suggest that the orderability of the postchoice feedback stimuli is important for crows' transitive responding. 相似文献
69.
Signal-detection analyses of conditional discrimination and delayed matching-to-sample performance
下载免费PDF全文
![点击此处可从《Journal of the experimental analysis of behavior》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Alsop B 《Journal of the experimental analysis of behavior》2004,82(1):57-69
Quantitative analyses of stimulus control and reinforcer control in conditional discriminations and delayed matching-to-sample procedures often encounter a problem; it is not clear how to analyze data when subjects have not made errors. The present article examines two common methods for overcoming this problem. Monte Carlo simulations of performance demonstrated that both methods introduced systematic deviations into the results, and that there were genuine risks of drawing misleading conclusions concerning behavioral models of signal detection and animal short-term memory. 相似文献
70.
Choice typically is studied by exposing organisms to concurrent variable-interval schedules in which not only responses controlled by stimuli on the key are acquired but also switching responses and likely other operants as well. In the present research, discriminated key-pecking responses in pigeons were first acquired using a multiple schedule that minimized the reinforcement of switching operants. Then, choice was assessed during concurrent-probe periods in which pairs of discriminative stimuli were presented concurrently. Upon initial exposure to concurrently presented stimuli, choice approximated exclusive preference for the alternative associated with the higher reinforcement frequency. Concurrent schedules were then implemented that gave increasingly greater opportunities for switching operants to be conditioned. As these operants were acquired, the relation of relative response frequency to relative reinforcement frequency converged toward a matching relation. An account of matching with concurrent schedules is proposed in which responding exclusively to the discriminative stimulus associated with the higher reinforcement frequency declines as the concurrent stimuli become more similar and other operants-notably switching-are acquired and generalize to stimuli from both alternatives. The concerted effect of these processes fosters an approximate matching relation in commonly used concurrent procedures. 相似文献