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221.
Ernest Sosa has argued that if someone knows that p, then his belief that p is “safe”. and Timothy Williamson has agreed. In this paper I argue that safety, as defined by Sosa, is not a necessary condition on knowledge – that we can have unsafe knowledge. I present Sosa’s definition of safety and a counterexample to it as a necessary condition on knowledge. I also argue that Sosa’s most recent refinements to the notion of safety don’t help him to avoid the counterexample. I consider three replies on behalf of the defender of safety, and find them all wanting. Finally, I offer a tentative diagnosis of my counterexample. 相似文献
222.
223.
This study examined the role of adolescents' interactions with both parents and teachers in the relationship between violent behavior/victimization at school and adolescent psychological distresss (depression and stress). Participants were 983 Spanish adolescents (mean age 13.7 years) from four public schools in the Valencian Community. Statistical analyses were carried out using structural equation modeling. Results showed victimization to be directly and positively related to psychological distress. Moreover, victimization was associated with negative father-adolescent communication, which mediated a part of the influence of victimization on distress. Regarding school-based violent behavior, no direct effect on psychological adjustment was found. Results showed, however, an indirect effect: violent behavior negatively influenced communication with parents and interaction with teachers which, in turn, was related to poor psychological adjustment. This model accounted for 47.7% of the variance in psychological distress. Findings are discussed in relation to previous research on adolescent psychosocial adjustment, and directions for future research are suggested. 相似文献
224.
We addressed the hypothesis that word segmentation based on statistical regularities occurs without the need of attention. Participants were presented with a stream of artificial speech in which the only cue to extract the words was the presence of statistical regularities between syllables. Half of the participants were asked to passively listen to the speech stream, while the other half were asked to perform a concurrent task. In Experiment 1, the concurrent task was performed on a separate auditory stream (noises), in Experiment 2 it was performed on a visual stream (pictures), and in Experiment 3 it was performed on pitch changes in the speech stream itself. Invariably, passive listening to the speech stream led to successful word extraction (as measured by a recognition test presented after the exposure phase), whereas diverted attention led to a dramatic impairment in word segmentation performance. These findings demonstrate that when attentional resources are depleted, word segmentation based on statistical regularities is seriously compromised. 相似文献
225.
The present research examines priming effects from a centrally presented single-prime word to which participants were instructed to either attend or ignore. The prime word was followed by a single central target word to which participants made a semantic categorization (animate vs. inanimate) task. The main variables manipulated across experiments were attentional instructions (attend vs. ignore the prime word), presentation duration of the prime word (20, 50, 80 or 100 ms), prime-target stimulus onset asynchrony (SOA; 300 vs. 800 ms), and temporal presentation of instructions (before vs. after the prime word). The results showed (a) a consistent interaction between attentional instructions and repetition priming and (b) a qualitatively different ignored priming pattern as a function of prime duration: reduced positive priming (relative to the attend instruction) for prime exposures of 80 and 100 ms, and reliable negative priming for the shorter prime exposures of 20 and 50 ms. In addition (c), the differential priming pattern for attend and ignore trials was observed at a prime-target SOA of 800 ms (but not at a shorter 300-ms SOA) and only when instructions were presented before the prime word. Methodological and theoretical implications of the present findings for the extant negative priming literature are discussed. 相似文献
226.
We examined whether the time course of exogenous spatial-cuing effects is sensitive to the allocation of attention in time.
Expectation for a target within a particular time window following the cue was manipulated by varying the proportion of trials
that appeared at each of three stimulus onset asynchronies in both a detection task and a two-alternative forced-choice discrimination
task. The time course of spatial-cuing effects was sensitive to the temporal expectation manipulation only in the discrimination
task. The results are discussed with reference to the role of attentional set in exogenous spatialcuing paradigms. 相似文献
227.
The present research examines the influence of prime-target relationship (associative and categorical versus categorical only) on priming effects from attended and ignored parafoveal words. Participants performed a lexical-decision task on a single central target, which was preceded by two parafoveal prime words, one of which (the attended prime) was spatially precued. The results showed reliable positive and negative priming effects from attended and ignored words, respectively. However, this priming pattern was observed only for the "associative and categorical", but not for the "categorical only" relationship condition. These results suggest that the lack of semantic priming effects from words in some prior studies may be attributed to the kind of material used (i.e. weakly-associated word pairs). 相似文献
228.
Juan Fernandez-Sierra 《British Journal of Guidance & Counselling》1998,26(3):449-461
Twelve case-studies of teenagers with diabetes (aged between 14 and 18) were carried out in a Spanish hospital, which provided them with outpatient assistance, and in the secondary schools where they studied. The findings identify some features peculiar to the concurrent experience of adolescence and diabetes. Some suggestions are offered to counsellors and teachers working with students experiencing this condition. 相似文献
229.
Miguel Perez Garcia Juan F. Godoy Garcia Nieves Vera Guerrero Jose A. Laserna Triguero Antonio E. Puente 《Neuropsychology review》1998,8(4):203-227
The evaluation of everyday memory (EM) was reviewed and reconceptualized. EM has established new objectives of study and the development of new methods to reach these objectives . At the basic level, this approach has already produced important discoveries and the development of new principles about memory and functioning. At the clinical level, this new area of investigation has resulted in evaluating deficits of EM, which is defined as what daily life functions remain impaired after a deficit pathology has occurred. A type of evaluation has evolved that is oriented toward treatment and extremely useful in designing rehabilitation programs for individuals with alterations in memory. 相似文献
230.
Mary W. Meagher Paul A. Illich Juan A. Salinas 《Neurobiology of learning and memory》1998,70(3):374-387
Past research indicates that the anticholinergic drug scopolamine disrupts memory and environmentally induced hypoalgesia in rats. The present study examined the impact of the centrally active cholinesterase inhibitor physostigmine, which enhances memory and central cholinergic activity, on brief shock-induced hypoalgesia on the tail-flick test using Sprague–Dawley rats. It is reported that physostigmine (0.1 mg/kg) potentiates the magnitude of this hypoalgesia. Contrary to past research, our results showed that omission of baseline testing did not eliminate hypoalgesia or its potentiation by physostigmine. Similar to its effects on memory, physostigmine (0.04, 0.1, and 0.25 mg/kg) has a nonmonotonic impact on brief shock-induced hypoalgesia; low doses potentiated hypoalgesia (0.1 mg/kg), whereas a high dose (0.25 mg/kg) disrupted it. These results provide further evidence that the cholinergic system indirectly affects pain reactivity by modulating the memory of the aversive event. 相似文献