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The authors investigated the accuracy of horizontal pointing movements toward a visual target viewed on a vertical video monitor; the view included a directional distortion between perceptual and action spaces. Although accurate coding of the movement vector in a relative (visual) system of coordinates has been found to occur when there is a prismatic perturbation, provided that the hand and the target are continuously visible, such accurate performance has never been reported for video-controlled situations with larger deviations. To evaluate whether visual relative coding is task specific or depends on the magnitude of the induced misalignment, the authors manipulated the intensity of directional perturbation (10° or 40°) in a video-controlled task. Whatever the directional bias, participants (N = 40) were initially inaccurate but adapted quickly within a few trial rehearsals, with a concomitant recalibration of segmental proprioception. In contrast with prism studies, relative coding of the hand-to-target vector seemed not to be operative in video-controlled situations, suggesting that target location is specified in an egocentric system of reference that includes hand-related proprioceptive signals, despite the presence of a (consciously) detected misalignment between visual and kinesthetic systems. 相似文献
113.
Stimulus generalization is suggested as an alternative method for examination of the “novelty? problem in motor learning. These experiments demonstrated that stimulus generalization occurs using simple movements as stimuli. The phenomenon of the “peak shift? in post-discrimination generalization gradients was also examined. The first experiment demonstrated that a peak shift occurred using linear movements as stimuli and that the magnitude of the peak shift increased as the difference between the training stimuli decreased. The second experiment showed similar results when the stimuli consisted of a range of movements rather than a single movement length. The final experiment provided evidence that perception of movement length is influenced by the magnitude of an immediately preceding movement. The relevance of these studies to current motor-learning theory is discussed. 相似文献
114.
《Journal of Religion, Spirituality & Aging》2013,25(3):41-54
ABSTRACT This study was designed to explore the various relationship patterns and the role religion plays as a coping resource for elderly couples in which at least one spouse has a chronic illness. Elderly couples were interviewed and also completed marital satisfaction and couple communication inventories. Five different relationship patterns emerged from the data: active couples, short-term caregivinjg couples, long-term caregiving couples, survival couples, and live-in caregiver couples. Various aspects of religion emerged as an important coping resource among the different relationship patterns. Ideas and questions for research and practice, generated by the study, are presented. 相似文献
115.
SNARC效应是当对数字进行奇偶判断时,即使数的奇偶性与数的大小无关,但右手(左手)对相对大(小)的数的反应快。首先介绍SNARC效应的起源和理论解释,然后总结SNARC效应的特性,论述SNARC效应和Simon效应以及MARC 效应的关系,并对SNARC效应的脑机制进行了概述,最后提出3个有待深入研究的问题:(1)SNARC效应的加工处理机制;(2)SANRC效应的理论探索;(3)SNARC效应的本质。 相似文献
116.
In this study, we investigate whether multiple digits can be processed at a semantic level without awareness, either serially or in parallel. In two experiments, we presented participants with two successive sets of four simultaneous Arabic digits. The first set was masked and served as a subliminal prime for the second, visible target set. According to the instructions, participants had to extract from the target set either the mean or the sum of the digits, and to compare it with a reference value. Results showed that participants applied the requested instruction to the entire set of digits that was presented below the threshold of conscious perception, because their magnitudes jointly affected the participant’s decision. Indeed, response decision could be accurately modeled as a sigmoid logistic function that pooled together the evidence provided by the four targets and, with lower weights, the four primes. In less than 800 ms, participants successfully approximated the addition and mean tasks, although they tended to overweight the large numbers, particularly in the sum task. These findings extend previous observations on ensemble coding by showing that set statistics can be extracted from abstract symbolic stimuli rather than low-level perceptual stimuli, and that an ensemble code can be represented without awareness. 相似文献
117.
通过3个实验考察语音反应方式下情绪效价对空间Simon效应的影响。实验1采用空间Simon任务范式考察语音反应方式下空间Simon效应的存在;实验2增加刺激的情绪效价维度,采用同样任务考察无关情绪效价对空间Simon效应的影响;实验3在实验2基础上进一步探讨当情绪效价为相关维度时对空间Simon效应的影响。研究结果表明:语音反应方式下,只有当情绪效价为相关维度时,才会对空间Simon效应产生影响,且该影响主要表现在积极效价对认知控制的促进作用而导致空间Simon效应减小或消失,此结果与极性编码一致性假说一致,也拓宽了躯体特异性假说,扩展了以往对情绪影响空间认知的理解。 相似文献
118.
Virginia W. Berninger Judith E. Rutberg Robert D. Abbott Noelia Garcia Marci Anderson-Youngstrom Allison Brooks Cynthia Fulton 《Journal of School Psychology》2006,44(1):3-30
Three studies evaluated Tier 1 early intervention for handwriting at a critical period for literacy development in first grade and one study evaluated Tier 2 early intervention in the critical period between third and fourth grades for composing on high stakes tests. The results contribute to knowledge of research-supported handwriting and composing instruction that informs practice as school psychologists are empowered to embrace the role of intervention specialist. The first study found that neurodevelopmental training (orthographic-free motor activities and motor-free orthographic activities) led to improved accuracy and legibility of letter formation, but that direct handwriting instruction with visual cues and verbal mediation led to improved automatic handwriting (rate of writing legible letters) and transfer to improved word reading. The second study found that neither motor training nor orthographic training alone added value to direct instruction in automatic letter writing and composing practice in developing handwriting skills, which transferred to improved word reading; but the added motor training did improve performance on a grapho-motor planning task for sequential finger movements that is relevant to composing. A related analysis showed that direct instruction with visual cues and memory delays may reduce reversals. A third study found that adding handwriting to reading instruction improved handwriting but did not add value to reading outcomes for at risk readers; reading instruction alone was beneficial for word reading, decoding, and comprehension. The fourth study showed that comprehensive, explicit instruction in the processes of composition led to more significant improvement, based on group and individual data, than did the regular fourth grade program, on high stakes writing assessment. 相似文献
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