A compelling impression of movement, which is perceptually indistinguishable from a real displacement, can be elicited by patterns containing no spatially displaced elements. An apparent oscillation, w-movement, was generated by a stationary pattern containing a large number of horizontal pairs of spatially adjacent dots modulated in brightness. The observer’s task was to adjust the perceived amplitude of the w-motion to match the amplitude of a real oscillation. All of the data can be accounted for by a simple rule: If the relative change in the luminance,W = αL/L, between two adjacent stationary dots is kept constant, the distance over which these dots appeared to travel in space comprises a fixed fraction of the total distance by which they are separated. The apparent amplitude of the w-motion increases strictly in proportion with luminance contrast, provided that the contrast is represented in the motion-encoding system by a rapidly saturating compressive Weibull transformation. These findings can be explained in terms of bilocal motion encoders comparing two luminance modulations occurring at two different locations. 相似文献
Two experiments are reported addressing the preparation and initiation of movements with equal or unequal timing properties for both hands. Temporal coordination was examined in two movement tasks: one in which both hands performed the movements simultaneously (simultaneous aiming task) and one in which only one alternative of two possible movements was executed (choice aiming task). For each task a different group of subjects was used. Besides the timing relationships between both movements, the effects of preparation interval (1, 3, and 5 s), the average velocity (7, 14, 17.5, and 70 cm/s), the presence of advance information about the required velocity of the movement(s), and practice were investigated. Based on the common- and the specific-timing notions, distinct hypotheses were tested as to the effects of the variables on the temporal coordination as revealed by reaction time. A main result was that the effects of timing differences between the hands was task specific. For the choice task the data are in agreement with the common-timing notion of coordination, i. e., only one timing demand at a time can be prepared, whereas in the simultaneous task evidence was obtained for the specific-timing notion, i. e., independent preparation and initiation of different timing properties for the hands. However, it is argued that the results of the choice task probably do not reflect a general inability to prepare movements of different timing requirements for both hands, but is related to a task-specific strategy of selective preparation. 相似文献
The article discusses two basic paradigms of western educational theory, namely the concept of “influence” and the concept of “development”. Two historical contextes are analyzed, John Locke's theory of human learning and Jean-Jacques Rousseau's theory of natural development. Both theories are rejected in favour of a position beyond “influence” and “development”. This position of a theory of education (Erziehung) is marked with the term “moral communication”. 相似文献
Abortion considerations require deep reflection on law, convention, social mores, religious norms, family contexts, emotions, and relationships. I have three arguments. First, a liberal “right to choose” framework is inadequate because it is based on individualist notions of rights. Second, reproductive freedoms should be extended to all women. Third, abortion ethics involves a dialectical interplay between rights and responsibilities, and between social, cultural, and particular contexts, and is best understood in terms of moral praxis. 相似文献
Mana: Revue de Sociologie et d'Anthropologie Caen: Department of Sociology, University of Caen, Esplanade de la Paix, 1400 Caen, France. 242 pp, 81 FF (in France, inch postage)
Desh Pardesh: The South Asian Presence in Britain Roger Ballard, ed., 1994 London: Hurst & Co. 296 pp., £9.95 (pb) ISBN 1–85065–092–6
Religions et sécurité international Jean‐François Mayer, 1995 Bern: Office Central de la Défense Series: Études relatives à la politique de sécurité, No. 2/1995 143 pp.
Essential Teachings His Holiness the Dalai Lama London: Souvenir Press, 1995 152 pp., £9.99 (hb) ISBN 0–285–63273–6
Voices of Islam John Bowker, 1995 Oxford: Oneworld Publications 188 pp., £8.95 ISBN 1–85168–095–0
A Short History of the Bahá'i Faith Peter Smith, 1996 Oxford: Oneworld Publications 168 pp., £5.95 (pb) ISBN 1–85168–070–5
A Short History of Islam William Montgomery Watt, 1996 Oxford: Oneworld Publications 156 pp., £5.95 (pb) ISBN 1–85168–109–4
Dictionary of the Middle East Dilip Hiro, 1996 Basingstoke: Macmillan 367 pp., £14.99 (pb) ISBN 0–333–65926–0
The Hebrew Bible Dan Cohn‐Sherbok, 1996 London: Cassell 257 pp., £55.00 (hb), £13.99 (pb) ISBN 0–304–33702–1 (hb), 0–304–33703‐X (pb)
The Puzzle of God Peter Vardy, 1995 London: Fount/Harper Collins 240 pp., £7.99 ISBN 0–00–627965–1 相似文献
The Enlightenment regarded language as one of the most significant achievements of man. Consequently inquiries into the origin and development of language play a central role in eighteenth-century moral philosophy. This new science of man consciously adopts the method of analysis and synthesis used in the natural sciences of the time. In moral philosophy, analysis corresponds to the search for the basic principles of human nature. Synthesis is identified with the attempt to interpret all artificial achievements of man (arts, sciences and institutions) as the effect of these principles and of man's physical and social environment - an attempt known as theoretical history. The type of explanation envisaged by theoretical historians is based on the principle of causality. It consists in a genetic reconstruction of the social phenomenon under investigation. Inquiries into the origin of language follow this pattern of explanation. They form part of theoretical history and thus represent a major aspect of the eighteenth-century scientific study of man. 相似文献
The antidepressants desipramine and imipramine were compared within the framework of a multiclinical study performed under the conditions of a controlled clinical experiment. There has been found a time-different remission of affective symptoms, which was not detectable for the inhibition of drive. The tachythymoleptic action of desipramine is discussed with reference to these results. Evaluation of the possibility of controlling affects shows different ranges of activity of desipramine and imipramine, with desipramine influencing especially negative psychoenergetic symptoms in the area of drives and emotions and imipramine, restrictive symptoms in addition to differential phenomena of the psychomotor expression. 相似文献