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431.
McComb C Sangha S Qadry S Yue J Scheibenstock A Lukowiak K 《Neurobiology of learning and memory》2002,78(1):23-34
Aerial respiratory behavior in the pond snail Lymnaea was operantly conditioned so that snails learned not to perform aerial respiration in a hypoxic environment. Snails were trained in either the standard context (no food odorant) or a carrot (food-odorant) context. An operant training procedure of two 45-min training sessions with a 1-h interval between the sessions followed by a third 45-min training session 18 h later was sufficient to produce associative learning and long-term memory (LTM) that persisted for at least 5 days. If, however, following the third operant training session snails received three 45-min extinction training sessions, with each extinction session separated by at least a 1-h interval, LTM was not observed when tested the following day. That is, the memory was extinguished. Extinction, however, did not occur if the context of the extinction training was different from the context of the associative training. That is, in the snails trained in the standard context, extinction did not occur if the extinction training sessions were performed in the food-odorant context and vice versa. 相似文献
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433.
Ken Daley 《Philosophical Studies》2010,150(3):349-372
Jerry Fodor (Concepts: Where cognitive science went wrong. New York: Oxford University Press, 1998) famously argued that lexical concepts are unstructured. After examining the advantages and disadvantages of both the classical
approach to concepts and Fodor’s conceptual atomism, I argue that some lexical concepts are, in fact, structured. Roughly
stated, I argue that structured lexical concepts bear a necessary biconditional entailment relation to their structural constituents. I develop this account of the structure of lexical concepts within the framework
of Pavel Tichy’s (The foundations of Frege’s logic. Berlin, New York: De Gruyter, 1988) theory of constructions. I argue that concepts are constructions which can be combined by way of Tichy’s construction-forming
operations of composition and closure and an additional operation, simplification, which I propose in section 6. The last of these construction-forming operations plays a central role in my account of lexical
concept structure. Stated generally, structured lexical concepts are a result of simplifying their structural constituents. 相似文献
434.
The Pearson correlation coefficient can be translated to a common language effect size, which shows the probability of obtaining a certain value on one variable, given the value on the other variable. This common language effect size makes the size of a correlation coefficient understandable to laypeople. Three examples are provided to demonstrate the application of the common language effect size in interpreting Pearson correlation coefficients and multiple correlation coefficients. 相似文献
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To draw valid inference about an indirect effect in a mediation model, there must be no omitted confounders. No omitted confounders means that there are no common causes of hypothesized causal relationships. When the no-omitted-confounder assumption is violated, inference about indirect effects can be severely biased and the results potentially misleading. Despite the increasing attention to address confounder bias in single-level mediation, this topic has received little attention in the growing area of multilevel mediation analysis. A formidable challenge is that the no-omitted-confounder assumption is untestable. To address this challenge, we first analytically examined the biasing effects of potential violations of this critical assumption in a two-level mediation model with random intercepts and slopes, in which all the variables are measured at Level 1. Our analytic results show that omitting a Level 1 confounder can yield misleading results about key quantities of interest, such as Level 1 and Level 2 indirect effects. Second, we proposed a sensitivity analysis technique to assess the extent to which potential violation of the no-omitted-confounder assumption might invalidate or alter the conclusions about the indirect effects observed. We illustrated the methods using an empirical study and provided computer code so that researchers can implement the methods discussed. 相似文献
439.
This paper explores the nature of reflective writing through the experience of the researchers in running a series of writing workshops with a group of higher education practitioners working in a UK further education college. The focus here is on reflective writing, which was chosen to start the sequence of workshops, as it was perceived as a form of writing with which the participants would be familiar, given its role in the education and development of teachers within the sector. Our assumption was that this familiarity would facilitate the writing process and participants would readily respond by engaging in reflective writing. However, in practice this proved not to be the case, despite being introduced to a variety of different forms of writing over a series of workshops, it took the participants longer than we expected to begin to write. This led us to question our assumptions about the starting point for the writing workshops and what they might achieve. The paper draws on field notes made during the writing initiative and data gathered through focus groups and interviews with the participants, as well as extracts of their writing to examine their experiences. Different conceptualisations of reflective writing are identified and their implications are explored in relation to the participants’ engagement with writing and their experience of professional development. 相似文献
440.
This paper is concerned with the ways in which reflective practice is learnt, taught and assessed within the profession of occupational therapy. It utilises individual experiences of reflection of both students and staff members in university and practice placement settings. The discussion places reflection within learning a profession’s way of being and individual learner’s relation to this ‘sense of being’. It concludes that the ‘rote’ way in which reflection is currently used to demonstrate evidence of reflective practice is detrimental to the development of a reflective professional, in this instance, an occupational therapist. 相似文献