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131.
A view of the world through the bat's ear: the formation of acoustic images in echolocation 总被引:1,自引:0,他引:1
J A Simmons 《Cognition》1989,33(1-2):155-199
Echolocating bats perceive objects as acoustic images derived from echoes of the ultrasonic sounds they emit. They can detect, track, identify, and intercept flying insects using sonar. Many species, such as the big brown bat, Eptesicus fuscus, emit frequency-modulated sonar sounds and perceive the distance to targets, or target range, from the delay of echoes. For Eptesicus, a point-target's image has a sharpness along the range axis that is determined by the acuity of echo-delay perception, which is about 10 ns under favorable conditions. The image as a whole has a fine range structure that corresponds to the cross-correlation function between emissions and echoes. A complex target- which has reflecting points, called "glints", located at slightly different distances and reflects echoes containing overlapping components with slightly different delays--is perceived in terms of its range profile. The separation of the glints along the range dimension is encoded by the shape of the echo spectrum created by interference between overlapping echo components. However, Eptesicus transforms the echo spectrum back into an estimate of the original delay separation of echo components. The bat thus converts spectral cues into elements of an image expressed in terms of range. The absolute range of the nearest glint is encoded by the arrival time of the earliest echo component, and the spectrally encoded range separation of additional glints is referred to this time-encoded reference range for the image as a whole. Each individual glint is represented by a cross-correlation function for its own echo component, the nearest of which is computed directly from arrival-time measurements while further ones are computed by transformation of the echo spectrum. The bat then sums the cross-correlation functions for multiple glints to form the entire image of the complex target. Range and shape are two distinct features of targets that are separately encoded by the bat's auditory system, but the bat perceives unitary images that require fusion of these features to create a synthetic psychological dimension of range. The bat's use of cross-correlation-like images reveals neural computations that achieve fusion of stimulus features and offers an example of high-level operations involved in the formation of perceptual "wholes". 相似文献
132.
Katie E. Cherry Shannon S. Simmons Cameron J. Camp 《Journal of Clinical Geropsychology》1999,5(3):159-175
We used the spaced retrieval method to improve recall of everyday objects in older adults with probable Alzheimer's Disease. Three training sessions were administered on alternate days over a week. On each training trial, participants selected a designated object from an array of items at increasingly longer retention intervals. Implicit and explicit memory for the target item was assessed after each session. Results indicated that spaced-retrieval training enhanced retention of the target item within and across sessions for all participants. Implications of these findings for current views on memory interventions for cognitively impaired older adults are discussed.
affiliated with the Menorah Park Center for the Aging 相似文献
133.
134.
This paper examines an aspect of the self-concept — salience of the self or self-consciousness — which has generally been neglected in the past. In an empirical study of nearly 2,000 children and adolescents, it was found that striking sex differences emerge during the adolescent period. Girls are considerably more self-conscious than boys, more vulnerable to criticism, and more concerned with promoting interpersonal harmony. Overall, adolescent girls are increasingly “people-oriented” while boys stress achievement and competence. It is suggested that these differences reflect the social definitions of sex roles. 相似文献
135.
T G Raslear D Shurtleff L Simmons 《Journal of comparative psychology (Washington, D.C. : 1983)》1992,106(4):374-382
The bisection method of animal psychophysical scaling was examined as a measurement procedure. The critical assumptions of bisection scaling, as described by Pfanzagl (1968), were tested to determine if a valid equal-interval scale could be derived. A valid scale was derived in which loudness for the rat (Rattus norvegicus; n = 13) was a power function of sound pressure for 4-kHz tones. Masking noise reduced the discriminability of tonal stimuli but did not affect the bisection point. This result is consistent with an interval scale representation of loudness and demonstrates scale meaningfulness. Loudness bisection data that have been reported in the literature for 3 species (humans, rats, and pigeons) are in substantial agreement with our results. 相似文献
136.
A small group workshop, developed for Big Sisters of Colorado, Inc. to complement their traditional program, was evaluated to determine its effectiveness for working-class and underclass adolescent girls. The "Life Choices" program was successful with working-class Ss, resulting in increased internality and perceived competence for school success, social relationships and general life events. These Ss also increased their knowledge of both traditional and non-traditional career alternatives. However, the program did not succeed with underclass adolescent girls, who showed no increase in internality or knowledge of career alternatives and reported a significant decrease in perceived competence after completing the same program. It is suggested that the goals and strategies presented in such programs must be designed specifically for adolescents of different backgrounds if they are to result in empowerment of the participants. 相似文献
137.
Tamara Echter Uichol Kim Ching-ven James Kau Hong-Ceng Li Carolyn Simmons & Colleen Ward 《Asian Journal of Social Psychology》1998,1(3):271-288
This study investigates the relative importance of human values at four levels: (a) global, (b) national, (c) family, and (d) individual, among university students from four countries – the United States (137 females, 78 males, one unspecified), the People's Republic of China (66 females, 170 males, one unspecified), Taiwan (156 females, 101 males), and Singapore (148 females, 119 males). Students rated the importance of passing on the 68 items in the Child Socialization Value Survey to their children or to future generations. Principal Components Analysis was performed on the pooled sample of student responses and revealed a five-factor solution described by: universalism, family, nationalism, prestige, and autonomy. This study demonstrates that the values endorsed by samples of Chinese across different geopolitical backgrounds are not consistent. 相似文献
138.
139.
140.
Byron Simmons 《European Journal of Philosophy》2021,29(1):120-136
Pessimism is, roughly, the view that life is not worth living. In chapter 46 of the second volume of The World as Will and Representation, Arthur Schopenhauer provides an oft‐neglected argument for this view. The argument is that a life is worth living only if it does not contain any uncompensated evils; but since all our lives happen to contain such evils, none of them are worth living. The now standard interpretation of this argument (endorsed by Kuno Fischer and Christopher Janaway) proceeds from the claim that the value—or rather valuelessness—of life's goods makes compensation impossible. But this interpretation is neither philosophically attractive nor faithful to the text. In this article, I develop and defend an alternative interpretation (suggested by Wilhelm Windelband and Mark Migotti) according to which it is instead the actual temporal arrangement of life's goods and evils that makes compensation impossible. 相似文献