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121.
122.
Kristjánsson A 《Scandinavian journal of psychology》2007,48(2):97-113
This paper presents a review and summary of experimental findings on the role of attention in the preparation of saccadic eye movements. The focus is on experiments where performance of prosaccades (saccades towards a suddenly appearing item) and antisaccades (saccades of equal amplitude in the direction opposite to where the target moved) is compared. Evidence suggests that these two opposite responses to the same stimulus event entail competition between neural pathways that generate reflexive movements to the target and neural mechanisms involved in inhibiting the reflex and generating a voluntary gaze shift in the opposite direction to the target appearance. Evidence for such a competition account is discussed in light of a large amount of experimental findings and the overall picture clearly indicates that this competition account has great explanatory power when data on saccadic reaction times and error rates are compared for the two types of saccade. The role of attention is also discussed in particular in light of the finding that the withdrawal of attention by a secondary task 200 to 500 ms before the saccade target appears, leads to speeded antisaccades (without a similar increase in error rates), showing that the results do not simply reflect a speed-accuracy trade-off. This result indicates that the tendency for "reflexive" prosaccades is diminished when attention is engaged in a different task. Furthermore, experiments are discussed that show that as the tendency for a reflexive prosaccade is weakened, antisaccades are speeded up, further supporting the competition account of pro- and antisaccade generation. In the light of evidence from neurophysiology of monkeys and humans, a tentative model of pro- and antisaccade generation is proposed. 相似文献
123.
汉语发展性阅读障碍亚类型的初步探讨 总被引:12,自引:0,他引:12
以阅读水平匹配组为参照对29名汉语发展性阅读障碍儿童的认知缺陷模式进行了分析,并考察了不同亚类型阅读障碍儿童的汉字识别模式。结果表明汉语发展性阅读障碍存在不同的亚类型,以语音缺陷型、快速命名缺陷型及两者结合的双重缺陷型为主,与英语国家研究中的双重缺陷假设一致。语音缺陷型儿童汉字识别时有更多的语义错误,对声旁中的部分语音线索不敏感;快速命名缺陷型儿童汉字识别时依赖声旁语音线索,表现出阅读发展的一般延迟;双重或多重认知缺陷型是阅读损伤最严重的亚类型 相似文献
124.
This article argues for the importance of theoreticalreflections that originate from patients' experiences.Traditionally academic philosophers have linked their ability totheorize about the moral basis of medical practice to their roleas outside observer. The author contends that recently a new typeof reflection has come from within particular patientpopulations. Drawing upon a distinction created by AntonioGramsci, it is argued that one can distinguish the theorygenerated by traditional bioethicists, who are academicallytrained, from that of ``organic' bioethicists, who identifythemselves with a particular patient community. Thecharacteristics of this new type of bioethicist that are exploredin this article include a close association of memoir andphilosophy, an interrelationship of theory and praxis, and anintimate connection between the individual and a particularpatient community. 相似文献
125.
Impaired processing of rapid stimulus sequences in dyslexia 总被引:1,自引:0,他引:1
Apart from their reading difficulties, dyslexic subjects often suffer from a variety of subtle sensory and motor deficits. Whether these deficits have a causal relationship to the reading disorder, form additional risk factors, or are totally independent of the reading problem, is under vivid debate. In this article, we review the evidence and suggest that ‘sluggish attentional shifting’ (SAS) can account for the impaired processing of rapid stimulus sequences in dyslexia. Within this novel framework attention-related prolongation of input chunks is decisive for many small deficits found in dyslexic subjects. 相似文献
126.
语音回路与阅读理解关系的眼动研究 总被引:4,自引:0,他引:4
语音回路是工作记忆中的一个重要成分。由于工作记忆在言语理解中有重要作用,所以负责加工语音信息的语音回路可能也和阅读理解有密切关系。但是,迄今为止直接研究语音回路影响阅读理解的研究不是很多,而且得出的结论也不太一致。研究使用眼动分析方法探讨语音回路与汉语阅读理解的关系。研究采用抑制发音和错误干扰相结合的范式考查正常条件下和抑制发音条件下的阅读特点的差别性。结果表明:(1)在一般阅读难度情况下,语音回路会延缓阅读速度;(2)两种阅读条件下都出现了同音效应,即同音字的首次注视时间、总注视时间都比非同音字短;(3)语音在汉语阅读的早期就发挥了作用,而且同音字错误比非同音字错误更容易被恢复 相似文献
127.
不规则几何图形识别取样特征的眼动研究 总被引:1,自引:0,他引:1
探讨不规则几何图形识别中取样的眼动特征。被试为12名大学生,刺激材料为20个不规则几何图形,采用EyelinkII型眼动仪。结果发现,随作业难度加大,被试在认知加工中的有效取样时间比显著下降。在不良视觉条件下,图形信息的取样点数量显著减少,眼动扫视路径显著增长。在识别旋转图形时,有效取样时间下降,取样点数量增加,眼动扫视路径增长。图形信息的显示条件与显示方式的交互作用对图形识别的反应时、取样点的数量和眼动扫视路径长度的影响显著。 相似文献
128.
By using the Gezi Park protests that took place in Turkey in 2013 as a case, we explore the significance of emotional echo-chamber involved in protests. The analyses are composed of thirty-seven interviews conducted with activists on how they define and understand their preferences and motivations for protesting. We discuss how participants get influenced by beliefs, motives and opinions and bring forth the changes of emotions during such processes and help create an emotional echo-chamber. 相似文献
129.
Tapani Korhonen Timo Ruusuvirta Juha Arikoski 《Integrative psychological & behavioral science》1997,32(2):123-130
Direction and the frequency of spontaneous head movements during the ITIs following forward and backward paired trials were
compared to an acquisition of a conditioned orienting (alpha) response directed to the side of the tone source. The head movements
were analyzed from video recordings using classification of head turns to preferred and to nonpreferred directions. The results
showed a significant increase in the alpha responses during the forward paired conditioning to the preferred direction and
rapid extinction during the subsequent backward conditioning sessions. Spontaneous head movements during the ITIs increased
to the same preferred direction as the conditioned alpha responses. The results of this experiment suggest that the response
initially elicited by the CS can later appear as “spontaneous,” instrumental behavior, the form and the nature of which is
determined by the characteristics of the conditioned alpha response developing as a result of classical conditioning. 相似文献
130.
Rapid acquisition of discrete-trial lever-press avoidance: effects of signal-shock interval 总被引:1,自引:0,他引:1
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Acquisition of discrete-trial lever-press avoidance learning was studied in three experiments. Experiment I compared a new training procedure, which produces rates of lever-press avoidance learning comparable to those obtained in shuttle boxes, with a “conventional”, less efficient training procedure. A factorial design was used to compare continuous versus intermittent shock and a long-variable versus a short-fixed signal-shock interval. Learning was best in the groups trained with the long and variable interval and poorest in those trained with the short and fixed interval. Type of shock had no effect. Experiment II separated the effects of duration from those of variability of the signal-shock interval. Fixed and variable intervals of 10 and 60 sec were tested and duration was the only significant factor. Experiment III addressed the effect of the differential opportunity to avoid provided by long signal-shock intervals by varying this interval from 10 to 60 sec in 10-sec steps. Only the 10-sec group showed slow acquisition relative to the others. Analysis of avoidance response latencies showed that the distributions for all groups were positively skewed and that skewness increased with increasing duration of the signal-shock interval. At intervals longer than 20 sec, the animals made progressively less use of their increased opportunity to respond. The data do not support the opportunity-to-respond interpretation of the effects of duration of signal-shock interval and suggest that some type of inhibitory process may block lever-press avoidance learning at intervals as short as 10 sec. The significance of these findings for species-specific defense reaction and preparedness theories was emphasized. 相似文献