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221.
Stip E Bigras MJ Mancini-Marïe A Cosset ME Black D Lecours AR 《Brain and cognition》2004,55(3):466-469
OBJECTIVE: This study investigated the long-term effects of bilateral prefrontal leukotomy on lexical abilities in schizophrenia subjects. METHOD: we compared performances of leukotomized (LSP), non-leukotomized schizophrenia patients (NLSP) and normal controls, using a test of verbal fluency. Multiple case and triple comparison design were implemented. i.e., the performance of each LSP was compared to that of NLSP and that of a normal control. The sample consisted of four LSP, four NLSP, and four normal subjects. Subjects were matched in sex, age, handedness, and schooling. In Addition, schizophrenia groups were matched in diagnosis and years of hospitalization. Quantitative and qualitative analyses of generated words and errors produced by subjects were carried out. RESULTS: A deficiency in both groups of schizophrenia was observed, although a better performance in LSP patients was detected. CONCLUSION: Intact Lexical ability in LSP indicates its poor relation to the frontal lobe. 相似文献
222.
In two experiments, we examined why a singleton distractor has a stronger interfering effect in visual search when the target identity is uncertain. When participants searched for a shape, a color singleton distractor had a larger slowing effect in a mixed block, in which the target shape could change from trial to trial, than in a pure block, in which the target shape remained the same. Importantly, this increased singleton distractor effect could be traced back entirely to intertrial priming, since the increased costs occurred only on trials in which the target and the singleton distractor swapped identity (Experiment 1, allowing for priming between targets and singleton distractors) or on trials in which the target alone changed identity while the singleton distractor remained constant (Experiment 2, allowing for priming between targets only). This suggests that target uncertainty itself does not lead to strategic changes in the attentional selection of singletons. Instead, selection is affected by relatively automatic priming mechanisms that may be enhanced by competition for attention. 相似文献
223.
The aim of the present study was to determine whether monitoring measures are differentially disturbed in dysexecutive patients after frontal lesions. Twelve dysexecutive patients and 12 healthy controls were administered a paired-associates learning task. Their performances on recall prediction, judgment-of-learning (JOL), and feeling-of-knowing judgment (FOK) were then compared. The results revealed that the two groups differed only on accuracy measures of the FOK paradigm. The study of the overall correlations between the three measures of metamemory revealed a significant relation between recall prediction and accuracy measures of the JOL. We failed to find any significant correlation with the accuracy measures of the FOK. Taken together, our data confirm that metamemory experience is not a unitary construct but rather a group of distinct and quite independent mechanisms. 相似文献
224.
We present evidence that advance information reducing the number of stimulus-response alternatives in a choice reaction time (RT) task can shorten the very latest motoric stages of RT. Effects of such advance information on late stages of RT have been demonstrated recently by Osman, Moore, and Ulrich (Acta Psychol. 90 (1995) 111), Leuthold, Sommer, and Ulrich (J. Exp. Psychol: Gen. 125 (1996) 307), Müller-Gethmann, Rinkenauer, Stahl, and Ulrich (Psychophysiology 37 (2000) 507). These studies found that advance information shortens the portion of the RT interval following onset of a movement-related brain potential (lateralized readiness potential). Osman et al. and Müller-Gethmann et al. also examined the portion of the RT interval following the start of electromyographic (EMG) activity and found no effect of advance information. Based on Osman et al.'s null result, Leuthold et al. speculated that advance information may shorten only the RT stages preceding EMG activity. This conclusion, however, is questionable because of limitations in the EMG measures employed by both Osman et al. and Müller-Gethmann et al. We have reanalyzed the results of a previously reported experiment (Acta Psychol. 101 (1999) 243) to show that advance information can in fact affect the rate of recruitment of motor units in the prime mover of the responding limb. 相似文献
225.
Bing Q. Han Enrique J. Lavernia Farghalli A. Mohamed 《Philosophical Magazine Letters》2013,93(2):89-96
The mechanical behaviour of bulk ultrafine-grained Al-7.5 wt% Mg alloy consolidated from cryomilled powders has been investigated. The experimental data show that the alloy exhibits high strength, low strain hardening, serrated flow and relatively high ductility. In addition, the data indicate that the yield strength in tension is essentially equal to that in compression. The yield and flow strengths of the alloy are discussed in terms of strengthening processes that are related to grain size, the Orowan mechanism and solid-solution hardening. The serrations in the stress-strain curve are discussed in terms of dynamic strain ageing and deformation twinning. 相似文献
226.
Aïna Chalabaev Philippe Sarrazin Paul Fontayne Julie Boiché Corentin Clément-Guillotin 《Psychology of sport and exercise》2013,14(2):136-144
The role of sex stereotypes and gender roles in the sex differences observed in sport and exercise has been extensively investigated in sport psychology, past studies showing that stereotypes are internalized into the self during the socialization process. Although this research has provided clear evidence of the psychosocial roots of sex differences in athletics, focusing exclusively on an internalization explanation may not allow a complete understanding of the influence of stereotypes in this domain. This article presents two approaches that have been developed in mainstream psychology and discusses their relevance in sport psychology: (1) the situational approach, which considers that the mere presence of stereotypes in the environment is sufficient to affect individuals (e.g., stereotype threat theory); (2) the content of stereotypes approach (e.g., stereotype content model), which suggests that stereotypes about a particular group may be ambivalent, and that this ambivalence may serve to legitimize the status quo. 相似文献
227.
Mohamed Seedat Loni Baadjies Ashley van Niekerk Thoko Mdaka 《Journal of Psychology in Africa》2013,23(2):303-314
We use community psychology's accent on methodological pluralism and giving voice to the marginalised as a platform to critically examine the utility and outcome of photography as a data collection and community engagement method. Accordingly we focus on two community projects that used still photographs to identify environmental and household childhood injury risks respectively. The first project involved the visual documentation, examination and analysis of environmental threats in an informal settlement. The second project focused on the documentation and identification of selected childhood injury risks in and outside homes in an informal settlement. This study provided visual images that are detailed and complex and that allowed the researchers to acquire greater understandings than would have been possible from written texts alone. These photographs may be used to create injury risk awareness in the respective communities and among other relevant stakeholders. 相似文献
228.
229.
The Egyptian Revolution 2011 has shaken the Arab world and stirred up Middle-East politics. Moreover, it caused a rush in political science and the neighboring disciplines, which had not predicted an event like this and now have troubles explaining it. While many things can be learned from the popular uprising, and from the limitations of previous scholarship, our focus will be on a moral resource, which has occasionally been noticed, but not sufficiently explored: the role of humor in keeping up the spirit of the Revolution. For 18 days, protestors persevered at Liberation Square in Central Cairo, the epicenter of resistance; at times a few dozens, at times hundreds of thousands. What they did was to fight the terror of the regime, which reached absurd peaks during those days, with humor—successfully. We offer a social-functionalist account of the uprising, which includes behavioral as well as cultural levels of analysis, and illuminates how humorous means helped to achieve deadly serious goals. By reconstructing how Egyptians laughed themselves into democracy, we outline a social psychology of resistance, which uses humor both as a sword and a shield. 相似文献
230.
This study investigates the effects of expertise and presentation format on memorization processes in 24 expert and 24 novice soccer players, using a 2 × 3 factorial design with factors expertise (novice vs. expert) and presentation format (static vs. dynamic vs. combined). Players completed a recall reconstruction test and rated their invested mental effort after studying a static, dynamic and combined format presentation. Results indicated (a) that novices benefited more from the static than dynamic format, while expert players benefited more from the dynamic than static format; and (b) a negative effect of the combined format on the learning process of the two groups. Findings suggest the need to adapt the presentation format to players with different levels of expertise. 相似文献