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71.
72.
Three pigeons chose between random-interval (RI) and tandem, continuous-reinforcement, fixed-interval (crf-FI) reinforcement schedules by pecking either of two keys. As long as a pigeon pecked on the RI key, both keys remained available. If a pigeon pecked on the crf-FI key, then the RI key became unavailable and the crf-FI timer began to time out. With this procedure, once the RI key was initially pecked, the prospective value of both alternatives remained constant regardless of time spent pecking on the RI key without reinforcement (RI waiting time). Despite this constancy, the rate at which pigeons switched from the RI to the crf-FI decreased sharply as RI waiting time increased. That is, prior choices influenced current choice-an exercise effect. It is argued that such influence (independent of reinforcement contingencies) may serve as a sunk-cost commitment device in self-control situations. In a second experiment, extinction was programmed if RI waiting time exceeded a certain value. Rate of switching to the crf-FI first decreased and then increased as the extinction point approached, showing sensitivity to both prior choices and reinforcement contingencies. In a third experiment, crf-FI availability was limited to a brief window during the RI waiting time. When constrained in this way, switching occurred at a high rate regardless of when, during the RI waiting time, the crf-FI became available. 相似文献
73.
We present evidence that the supposed processing advantage for an SVfinO word order over an SOVfin word order in German argued for by Weyerts, Penke, Münte, Heinze, and Clahsen (2002) is supported by neither experimental nor theoretical evidence. Specifically, we show (a) that the frontocentral negativity for an SOVfin in comparison to an SVfinO word order in Weyerts et al.'s Experiments 2 and 3 is reducible to more general differences in the electrophysiological responses elicited by nouns versus verbs in a sentence context, and (b) that the P600 difference between the two word orders in Experiment 2, as well as the reading time differences in Experiment 1, result from the fact that the two supposedly ungrammatical conditions actually differ in their degree of ill-formedness. We conclude that there is no evidence for a processing disadvantage for SOVfin, thus reconciling Weyerts et al.'s results on German sentence processing with the grammatical regularities of German. 相似文献
74.
准备时间和预先信息对任务切换的影响 总被引:2,自引:1,他引:1
两个实验采用任务线索范式,考察了准备时间和预先信息对任务切换的影响。实验1的准备时间为可预测,实验2的为不可预测,以考察准备时间的可预测性对任务切换的影响。以被试执行重复任务、切到任务和切离任务的正确反应时为主要指标,结果:(1)在准备时间可预测和不可预测两种条件下,准备时间和预先信息之间存在显著交互作用。在可预测条件中,重复和切到任务的反应时随着准备时间的增加而减少,但切到代价无显著变化,切离任务的反应时不受准备时间的影响,切离代价表现出反准备效应;不可预测条件下,三种任务的反应时都随着准备时间的增加而减少,但是切到和切离代价表现出反准备效应;(2)切离任务的反应时和代价显著高于切到任务的反应时和代价;(3)在这两种条件下,都没有出现切换代价的准备效应 相似文献
75.
医管、医患双重博弈研究 总被引:1,自引:0,他引:1
在中国,老百姓"看病难,看病贵"问题已饱受各方诟病多时,政府不断出台的政策却收效甚微。通过分析医疗机构、管制者和患者所面临的风险与收益、行为与选择、医疗机构与管制者之间的重复博弈,医疗机构与患者之间的一次性博弈,提出医疗机构与管制者、医疗机构与患者的双重博弈假说。指出了"药价虚高"的根源以及解决的可能途径。 相似文献
76.
77.
信任是理性的还是非理性的,一直是信任研究中争论的焦点。在对理性信任观和非理性信任观进行比较分析之后,在"有限理性"和"心智成本"的框架下,提出了信任的有限理性观点,对信任的理性观和非理性观点做一整合。 相似文献
78.
We investigate the joint effects of decision risk and the stage of project completion on escalation of commitment. In two experiments, we demonstrate that the effect of decision risk is moderated by project stage such that the decision risk has the strongest effect on escalation of commitment at the intermediate stage of project completion. This is due to the dynamic influences underlying escalation of commitment. Whereas the need for project information influences resource commitment at the initial stage of a project, the need for project completion affects resource allocation at the terminal stage. In contrast, motivation to commit resources is disproportionately low at the intermediate stage since both the need for project information and the need for project completion are relatively weak. As such, the decision to commit resources is most sensitive to the moderating effect of decision risk when the project is about half complete. 相似文献
79.
From infancy, we recognize that labels denote category membership and help us to identify the critical features that objects within a category share. Labels not only reflect how we categorize, but also allow us to communicate and share categories with others. Given the special status of labels as markers of category membership, do novel labels (i.e., non‐words) affect the way in which adults select dimensions for categorization in unsupervised settings? Additionally, is the purpose of this effect primarily coordinative (i.e., do labels promote shared understanding of how we categorize objects)? To address this, we conducted two experiments in which participants individually categorized images of mountains with or without novel labels, and with or without a goal of coordination, within a non‐communicative paradigm. People who sorted items with novel labels had more similar categories than people who sorted without labels only when they were told that their categories should make sense to other people, and not otherwise. We argue that sorters' goals determine whether novel labels promote the development of socially coherent categories. 相似文献
80.
In their 2002 seminal paper Hauser, Chomsky and Fitch hypothesize that recursion is the only human-specific and language-specific mechanism of the faculty of language. While debate focused primarily on the meaning of recursion in the hypothesis and on the human-specific and syntax-specific character of recursion, the present work focuses on the claim that recursion is language-specific. We argue that there are recursive structures in the domain of motor intentionality by way of extending John R. Searle’s analysis of intentional action. We then discuss evidence from cognitive science and neuroscience supporting the claim that motor-intentional recursion is language-independent and suggest some explanatory hypotheses: (1) linguistic recursion is embodied in sensory-motor processing; (2) linguistic and motor-intentional recursions are distinct and mutually independent mechanisms. Finally, we propose some reflections about the epistemic status of HCF as presenting an empirically falsifiable hypothesis, and on the possibility of testing recursion in different cognitive domains. 相似文献