Abstract：
:Information about the direction of the virtual line between two positions in space (directional information) is used in many decision-making and motor tasks. We investigated how accurately directional information is processed by the brain. Subjects performed two types of task. In both tasks they sat at a table. In the first task they had to move their hand slowly and accurately from an initial position 40 cm in from of them to visually presented targets at a distance of 30 cm from the initial position (movement task). We analysed the initial movement direction. In the second task subjects had to position pointers in the direction of the targets as accurately as they could (perceptive task). We found that in the movement task the subjects started the movements to most targets in a direction that deviated consistently from the direction of the straight line between initial position and target position. The maximum deviation ranged from 5-10 degrees for the various subjects. The mean standard deviation was 4 degrees. In the perceptive task the subjects positioned the pointer in similarly deviating directions. Furthermore, we found that the maximum deviation in the pointer direction depended on the length of the pointer: the smaller the pointer, the larger the consistent deviations in the pointer direction. The shortest pointer showed deviations comparable to the deviations found in the movement task. These findings suggest that the deviations in the two tasks stem from the same source.
journal_name
Exp Brain Resjournal_title
Experimental brain researchauthors
de Graaf JB,Sittig AC,Denier van der Gon JJdoi
10.1007/BF00231466subject
Has Abstractpub_date
1991-01-01 00:00:00pages
434-8issue
2eissn
0014-4819issn
1432-1106journal_volume
84pub_type
杂志文章abstract：:Quantitative studies were made of the distribution of labeled intracortical axons after focal injections of horseradish peroxidase (HRP) into mouse barrel cortex, in vitro. The pattern of labeled fibers was compared to that of labeled cell bodies with respect to the barrel map in layer IV. We analyzed 4 cortices with ...
journal_title：Experimental brain research
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journal_title：Experimental brain research
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journal_title：Experimental brain research
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更新日期：1994-01-01 00:00:00
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更新日期：2009-09-01 00:00:00
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