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21.
传统医药文化在很长的历史时期内是以"附魅"的形式存在和发展的。巫术和"拜祖师"是其神秘化的主要手段。"附魅"缔造了权威,维护了受业者的既得利益,并为执业人员带来便利。近代科学以其精确性和实证性为传统医药文化的"祛魅"提供了契机。然而,随着科学技术的进一步发展,传统医药文化领域出现了一种"返魅"现象。 相似文献
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Abrams TW Yovell Y Onyike CU Cohen JE Jarrard HE 《Learning & memory (Cold Spring Harbor, N.Y.)》1998,4(6):496-509
An important recent insight in a number of neurobiological systems is that during learning, individual dually regulated proteins with associative properties function as critical sites of stimulus convergence. During conditioning in Aplysia, the Ca2+ /calmodulin-sensitive adenylyl cyclase (AC) in mechanosensory neurons serves as a molecular site of interaction between Ca2+ and serotonin [5-hydroxytryptamine (5-HT)]-two signals that represent the CS and US in these cells. Conditioning requires that the CS and US be paired within a narrow time window and in the appropriate sequence. AC shows an analogous sequence preference: It is more effectively activated when a pulse of Ca2+ precedes a pulse of 5-HT than when the 5-HT precedes Ca2+. One mechanism that contributes to this sequence preference is that Ca2+/calmodulin binding to AC accelerates the rate of AC activation by receptor-Gs. We have identified two additional properties of AC activation that would cause pairing with Ca2+ preceding 5-HT to be more effective than simultaneous pairing or pairing with the reciprocal sequence: (1) Activation of Aplysia AC by a Ca2+ pulse rose with a delay compared with activation by a 5-HT pulse. (2) A late pulse of Ca2+, which arrived after 5-HT, acted, via calmodulin, to accelerate the decay of AC activation by receptor-Gs. Together, these activation properties of AC may contribute to the CS-US sequence requirement of classical conditioning. 相似文献
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L E Jarrard 《Journal of comparative psychology (Washington, D.C. : 1983)》1975,89(5):400-408
Involvement of the hippocampus in memory was studied in the rat by employing a retention task with and without interpolated activity. Rats with extensive damage to hippocampus were able to relearn a preoperatively acquired single-alternation task with savings and to perform the single alternation with relatively long delays at a level similar to that of control subjects. However, hippocampals were more affected than normals by an interpolated activity that interferes with retention. The finding of normal retention combined with increased susceptibility to interference supports the view that the memory impairment in subjects with damage to hippocampus may be due to an excess of interference among stored information. 相似文献
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The hippocampus and motivation 总被引:2,自引:0,他引:2
L E Jarrard 《Psychological bulletin》1973,79(1):1-12
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The hardware and software for a computer-controlled training and testing system for primates are described. The computer (DDP-116 in the Computer-Controlled Psychology Laboratory at Carnegie-Mellon University) controls all stimulus presentation, reinforcement, and records data in a form ready for analysis on a larger computer. 相似文献
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多特征决策策略的信息搜索模式分析 总被引:2,自引:1,他引:1
决策策略的使用是不可见的内在过程 ,有效识别出决策者在信息整合时使用的策略对研究策略学习与转换、决策辅助与训练有重要意义。本文介绍了用过程追踪技术获取的信息搜索模式识别多特征决策策略的方法 ,即单步与多步跳转分析 ,并比较了两种方法的应用效果 ,讨论了跳转分析法的优点和局限。 相似文献
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文章标记量影响文章标记效应的实验研究 总被引:3,自引:0,他引:3
探讨文章阅读过程中文章标记量的多少对文章中不同类型的信号保持的影响。结果表明 ,在有标记的目标句上 ,少标记条件显著优于多标记条件和无标记条件 ,多标记条件与无标记条件之间无显著差异 ;在无标记的目标句上 ,无标记条件显著优于多标记条件和少标记条件 ,多标记条件与少标记条件之间无显著差异。这一结果支持在文章阅读过程中读者是微略性地运用文章标记的假设和交易效应的假设。 相似文献