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81.
Effects of Paired and Unpaired Eye-Blink Conditioning on Purkinje Cell Morphology 总被引:1,自引:0,他引:1
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Brenda J. Anderson Karen Relucio Karl Haglund Christy Logan Barbara Knowlton Judith Thompson Joseph E. Steinmetz Richard F. Thompson William T. Greenough 《Learning & memory (Cold Spring Harbor, N.Y.)》1999,6(2):128-137
This experiment addressed (1) the importance of conjunctive stimulus presentation for morphological plasticity of cerebellar Purkinje cells and inhibitory interneurons and (2) whether plasticity is restricted to the spiny branches of Purkinje cells, which receive parallel fiber input. These issues were investigated in naive rabbits and in rabbits that received paired or unpaired presentations of the conditioned stimulus (CS) and unconditioned stimulus (US). To direct CS input to the cerebellar cortex, pontine stimulation served as the CS. Air puffs to the cornea served as the US. Paired condition rabbits received pontine stimulation for 350 msec paired with a coterminating 100-msec air puff. Unpaired condition rabbits received the same stimuli in a pseudorandom order at 1- to 32-sec intervals. Rabbits were trained for a mean of 12 days. Naive rabbits received no treatment. In Golgi-stained Purkinje neurons in lobule HVI, total dendritic length, main branch length, total spiny branch length, and number of spiny branch arbors were all greater in the naive group than in the paired and unpaired groups, which did not differ. No differences were found between the hemispheres ipsilateral and contralateral to the trained eye. The dendritic length and number of branches for inhibitory interneurons did not differ across groups. The Purkinje cell morphological changes detected with these methods do not appear to be uniquely related to the conjunctive activation of the CS and US in the paired condition. 相似文献
82.
Beryl Curt 《Journal of community & applied social psychology》1994,4(4):309-312
Any short commentary is necessarily going to be partial in the various senses in which that can be understood. Here, partiality will be owned as the concentration upon limited aspects of a multifaceted phenomenon. To find a special edition on ‘Qualitative Social Psychology’ is an event. The focus here will be on two analytic moments of that event: concept and actualization. 相似文献
83.
Three experiments are reported that involve responding to the meaning or position of a word (Above or Below) presented above or below a fixation point. Position and word meaning conflicted (Above/below or Below/above) or were compatible (Above/above or Below/below), and the relative frequency of conflicting trials was varied. Experiment 1 required responses to the word and its position. Compatibility and frequency had no effect in the spatial task, but interacted strongly in the word task: Compatible stimuli were processed faster when conflicting trials were rare (20% conflicting), but conflicting stimuli were processed faster when they were frequent (80% conflicting). Experiments 2 and 3 used the word task only and extended these findings to intermediate (20%, 40%, 60%, and 80% conflicting) and more extreme (10%, 20%, 80%, and 90% conflicting) frequencies, respectively. The advantage for conflicting stimuli when they were frequent was taken as evidence for a strategy involving dividing attention between reported and unreported dimensions. 相似文献
84.
Control-related variables have clearly affected stress responses in previous research (Thompson, 1981). Prior work, however, has primarily emphasized the amount of control that subjects perceive they have. In the three studies reported here, we examined the added predictive utility of assessing subjects' desire for control. Data from all three studies indicate that subjects who have a high desire for control coupled with a low feeling of control are characterized by particularly high degrees of dental distress. These results were found both in settings where patients anticipated immediate dental treatment and where treatment was not imminent. In addition, the results indicate that this "at risk" group reported greater distress before and immediately after actual dental treatment. Furthermore, they remembered their dental treatment as being more aversive 1 week after treatment. The practical implications and theoretical significance of these data are considered. 相似文献
85.
A study is reported which aimed to examine several factors associated with career compromise and adjustment among 100 graduates in a bank. Contrary to predictions derived from Gottfredson's theory, satisfaction with the sextype of their jobs did not relate to perceptions of compromise; satisfaction with prestige explained some unique variance in compromise perceptions, but satisfaction with outlets for interests and use of skills and abilities were more important. Case data were used to explore other factors involved in the perception of career compromise. Qualitative data collected in the interviews with graduates highlighted several ways in which employers, graduates and career advisers can ease the transition from university to work. 相似文献
86.
Abstract: In recent years, Duncan Pritchard has developed a position in religious epistemology called quasi-fideism that he claims traces back to John Henry Newman's treatment of the rationality of religious belief. In this paper, we give three reasons to think that Pritchard's reading of Newman as a quasi-fideist is mistaken. First, Newman's parity argument does not claim that religious and non-religious beliefs are on a par because both are groundless; instead, for Newman, they are on a par because both often stem from implicit rather than explicit reasoning. Second, pace Pritchard, Newman's distinction between simple and complex assent does not map onto the Wittgensteinian distinction between groundless hinge commitments and beliefs that flow from these hinges. For Newman, simple and complex assent differ in terms of the believer's level of awareness of their grounds. Third, and finally, Newman does not reject Locke's evidentialism in toto. Instead, he argues that certitude is not restricted to beliefs stemming from intuition and demonstration but often rightly includes probabilistically supported (or fallibly evidenced) beliefs. 相似文献
87.
A job requirements approach to biodata item specification, similar to the content-valid job analysis approach developed by Pannone (1984), is used to predict customer service. Applicants rate the extent to which their current and previous jobs involve tasks and behaviours that have been identified through an analysis of the target job. On a sample of 245 employees in an international hotel, the criterion-related validity of job requirements biodata compares favourably with traditional construct-oriented biodata measures of customer service, cognitive ability and personality (Conscientiousness, Agreeableness and Extroversion). The job requirements approach provides a simple, direct and content-valid method of biodata item specification. As the approach can also be tailored for particular jobs or organizations, validity is also potentially optimized. 相似文献
88.
89.
The explicit task-cuing procedure involves presenting a cue that indicates which task to perform on a target. Responses are typically faster when tasks repeat than when they alternate, and this difference is often interpreted as a measure of the time required for executive control processes to change task set. This article suggests that the difference reflects priming of cue encoding when successive cues are identical or associatively related. Subjects responded to task repetitions more quickly when the cue on the current trial was associatively related to the cue on the previous trial (e.g., day --> night) than when the cues were unrelated (e.g., verb --> night). Models applied to the time course function--generated by manipulating the interval between the onsets of the cue and the target--showed that the facilitation was due to cue encoding, a process that does not require online executive control. 相似文献
90.
Logan GD Delheimer JA 《Journal of experimental psychology. Learning, memory, and cognition》2001,27(3):668-685
Three experiments asked whether subjects could retrieve information from a 2nd stimulus while they retrieved information from a 1st stimulus. Subjects performed recognition judgments on each of 2 words that followed each other by 0, 250, and 1,000 ms (Experiment 1) or 0 and 300 ms (Experiments 2 and 3). In each experiment, reaction time to both stimuli was faster when the 2 stimuli were both targets (on the study list) or both lures (not on the study list) than when 1 was a target and the other was a lure. Each experiment found priming from the 2nd stimulus to the 1st when both stimuli were targets. Reaction time to the 1st stimulus was faster when the 2 targets came from the same memory structure at study (columns in Experiment 1; pairs in Experiment 2; sentences in Experiment 3) than when they came from different structures. This priming is inconsistent with discrete serial retrieval and consistent with parallel retrieval. 相似文献