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81.
Testing for competence rather than for "intelligence" 总被引:194,自引:0,他引:194
D C McClelland 《The American psychologist》1973,28(1):1-14
82.
The influence of a native language on learning new speech sounds in adulthood is addressed using a network model in which
speech categories are attractors implemented through interactive activation and Hebbian learning. The network has a representation
layer that receives topographic projections from an input layer and has reciprocal excitatory connections with deeper layers.
When applied to an experiment in which Japanese adults were trained to distinguish the English /r/-/l/ contrast (McCandliss,
Fiez, Protopapas, Conway, & McClelland, 2002), the model can account for many aspects of the experimental results, such as
the time course and outcome of the learning, how it varies as a function of feedback, the relative efficacy of adaptive and
initially easy training stimuli versus nonadaptive and difficult stimuli, and the development of a discrimination peak at
the acquired category boundary. The model is also able to capture some aspects of the individual differences in learning.
nt]mis|This research was supported by NIMH Grant MH64445 and Training Grant 5T32-MH019983-07. The authors thank Susan G. Guion
for generously providing the recordings from her experiment and Mary L. Conway for her assistance with data analysis. Correspondence
concerning this article should be addressed to J. L. McClelland, Department of Psychology, 450 Serra Mall, Jordan Hall, Bldg.
420, Stanford, CA 94305 相似文献
83.
84.
Intra-habenular injection of 6-hydroxydopamine produces impaired acquisition of DRL operant behavior
E W Thornton G E Bradbury A P Wickens D R Mottram R McClelland 《Behavioral and neural biology》1990,53(2):291-297
The anatomical connections of the habenula complex indicate it provides a relay between limbic forebrain and midbrain. Somewhat paradoxically, consequences of nonspecific lesion of the habenula are ambiguous with little change in basic response evident within simple behavioral paradigms. However, the potential functional importance for this relay has more recently been indicated by the demonstration of deficits in the ability of lesioned animals to alter behavior appropriate to both internal and external stimuli in more demanding behavioral tasks. Doubts concerning the importance of the habenula remain because of the large number of descending fibers of passage through the habenula. To provide more substantive evidence, 6-hydroxydopamine was injected into the habenula of rats to provide more limited lesion of catecholaminergic terminals. Animals were subsequently trained on an operant DRL 20-s schedule for which deficits have been reported following nonspecific lesion of the habenula. Lesioned animals showed a tendency to overrespond and were significantly less efficient on the schedule with decreased number of reinforcements received relative to controls. While the neurotoxic lesion procedure used does not differentiate noradrenergic and dopaminergic damage, the importance of intact catecholaminergic systems within the habenula for effective DRL acquisition is consistent with the suggested importance of the habenula for feedback regulation of dopamine within the ventral tegmental area through ascending dopamine fibers to the habenula. 相似文献
85.
86.
How have connectionist models informed the study of development? This paper considers three contributions from specific models. First, connectionist models have proven useful for exploring nonlinear dynamics and emergent properties, and their role in nonlinear developmental trajectories, critical periods and developmental disorders. Second, connectionist models have informed the study of the representations that lead to behavioral dissociations. Third, connectionist models have provided insight into neural mechanisms, and why different brain regions are specialized for different functions. Connectionist and dynamic systems approaches to development have differed, with connectionist approaches focused on learning processes and representations in cognitive tasks, and dynamic systems approaches focused on mathematical characterizations of physical elements of the system and their interactions with the environment. The two approaches also share much in common, such as their emphasis on continuous, nonlinear processes and their broad application to a range of behaviors. 相似文献
87.
88.
The effect of fear‐inducing content on memory for advertisements and on retroactive and proactive interference of programme information
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The current study focused on whether fear‐inducing content in television advertisements leads to better memory for the advertisement but also impairs memory for programme information that either precedes the advertisements (retroactive interference) or that follows the advertisements (proactive interference). Fifty‐four participants (48 female) aged 18 to 55 watched a programme that had an advertisement break in the centre. This consisted of 6 advertisements with either fear‐inducing or nonfear‐inducing content. Participants were tested on their recall and recognition of the advertisement information as well as their recall of the first half and second half of the programme. The results indicated that fear‐inducing advertisements were better recalled than those that elicited no fear, and there was also evidence of proactive interference from fear‐inducing advertisements on programme recall. Limitations and implications of the study are discussed. 相似文献
89.
Blind mole rats (Spalax ehrenbergi) are solitary and aggressive subterranean rodents. Aggressive defense behavior in the mole rat functions to deter neighboring competitors from territory, food, and mates and includes seismic and odor signals. The aim of the present study was to determine whether the aggressive defense behavior displayed by male mole rats is testosterone dependent. Five behavioral variables were taken as being representative of such aggressive interaction: exposing teeth, biting, bulldozing movements of the head, soil blocking, and self‐grooming. We monitored male testosterone levels and aggressiveness throughout the annual cycle, which can be divided into three main climatic periods: cold and rainy (September–February); warm, during which the soil is still moist and easily excavated (March–May); and hot (June–August), when the soil is hard and dry. In a second experiment the effect of endogenous and exogenous testosterone on male aggressive defense behavior was determined before and after castration and following testosterone propionate replacement. We found fluctuations in male testosterone concentrations, with three peaks: in November, May, and August, one in each of the three climatic periods. However, these fluctuations did not correlate with male aggressive behavior, which remained constant throughout the year. Furthermore, because neither castration nor testosterone propionate replacement in castrated individuals affected their defense behavior, we suggest that such behavior in male mole rats is testosterone independent. The continuous excavation and maintenance of the mole rat’s underground tunnel system demands high energy expenditure year‐round and constant defense of territory sites and food caches from intraspecific rivals. Thus, although testosterone may fluctuate as a result of seasonal breeding cycles, constant high levels of aggressive defense throughout the year are crucial for the survival of the male mole rat in its solitary subterranean environment. Aggr. Behav. 27:64–72, 2001. © 2001 Wiley‐Liss, Inc. 相似文献
90.
It has been asserted that (I) tests of expectancy-value models require within-persons analyses and that (2) within-persons analyses yield better predictions of behavioral tendencies than do across-persons analyses. The first assertion is correct; the second is not. Justification for within-persons tests of expectancy-value models must be made on theoretical rather than empirical grounds. 相似文献