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Thérèse Collins 《Attention, perception & psychophysics》2016,78(6):1531-1537
Each eye movement introduces changes in the retinal location of objects. How a stable spatiotopic representation emerges from such variable input is an important question for the study of vision. Researchers have classically probed human observers' performance in a task requiring a location judgment about an object presented at different locations across a saccade. Correct performance on this task requires realigning or remapping retinal locations to compensate for the saccade. A recent study showed that performance improved with longer presaccadic viewing time, suggesting that accurate spatiotopic representations take time to build up. The first goal of the study was to replicate that finding. Two experiments, one an exact replication and the second a modified version, failed to replicate improved performance with longer presaccadic viewing time. The second goal of this study was to examine the role of attention in constructing spatiotopic representations, as theoretical and neurophysiological accounts of remapping have proposed that only attended targets are remapped. A third experiment thus manipulated attention with a spatial cueing paradigm and compared transsaccadic location performance of attended versus unattended targets. No difference in spatiotopic performance was found between attended and unattended targets. Although only negative results are reported, they might nevertheless suggest that spatiotopic representations are relatively stable over time. 相似文献
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Claire F. Michaels Thábata V. B. Gomes Rodolfo N. Benda 《Journal of motor behavior》2017,49(5):550-567
The theory of direct learning (D. M. Jacobs &; C. F. Michaels, 2007) has proven useful in understanding improvement in perception and exploratory action. Here the authors assess its usefulness for understanding the learning of a motor skill, bimanual tapping at a difficult phase relation. Twenty participants attempted to learn to tap with 2 index fingers at 2 Hz with a phase lag of 90° (i.e., with a right-right period of 500 ms and a right-left period of 125 ms). There were 30 trials, each with 50 tapping cycles. Computer-screen feedback informed of errors in both period and phase for each pair of taps. Participants differed dramatically in their success. Learning was assessed by identifying the succession of attractors capturing tapping over the experiment. A few participants’ attractors migrated from antiphase to 90° with an appropriate period; others became attracted to a fixed right-left interval, rather than phase, with or without attraction to period. Changes in attractor loci were explained with mixed success by direct learning, inviting elaboration of the theory. The transition to interval attractors was understood as a change in intention, and was remarkable for its indifference to typical bimanual interactions. 相似文献
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This study aims at reviving an important contribution by the pioneer neurobiologist and neurophilosopher Christfried Jakob
(1866–1956) to the understanding of higher cortical functions. Jakob studied cortical dynamics at multiple levels by comparing
gnoses and praxes and their corresponding pathological states, i.e. the agnosias and the apraxias. We herein provide a complete
English translation of Jakob’s original Spanish article dating to 1921, and further consider some key points under the scope
of the neuropsychological knowledge available then, and the research evidence available 90 years later. 相似文献
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