Abstract：
:We previously showed that saccades tend to overshoot briefly flashed targets that were manually displaced in the dark (Ren et al. 2006). However it was not clear if the overshoot originated from a sensory error in measuring hand displacement or from a premotor error in saccade programming, because gaze and hand position started at the same central position. Here, we tested between these hypotheses by dissociating the initial eye and hand position. Five hand/target positions (center, far, near, right, left) on a frontally-placed horizontal surface were used in four paradigms: Center or Peripheral Eye-hand Association (CA or PA, both gaze and right hand started from the center or a same peripheral location) and Hand or Eye Dissociation (HD or ED, hand or gaze started from one of three non-target peripheral locations). Subjects never received any visual feedback about the final target location and the subjects' hand displacement. In the CA paradigm, subjects showed the same overshoot that we showed previously. However, changing both initial eye and hand positions relative to the final target (PA) affected the pattern, significantly altering the directions of overshoots. Changing only the initial position of hand (HD) did not have this effect, whereas changing only initial eye position (ED) had the same effect as the PA condition (CA approximately HD, PA approximately ED). Furthermore, multiple regression analysis showed that the direction of the ideal saccade contributed significantly to the endpoint direction error, not the direction of the hand path. These results suggest that these errors do not primarily arise from misestimates of the hand trajectory, but rather from a process of comparing the initial eye position and the limb proprioceptive signal during saccade programming.
journal_name
Exp Brain Resjournal_title
Experimental brain researchauthors
Ren L,Blohm G,Crawford JDdoi
10.1007/s00221-007-0981-5subject
Has Abstractpub_date
2007-09-01 00:00:00pages
189-98issue
2eissn
0014-4819issn
1432-1106journal_volume
182pub_type
杂志文章abstract：:Single-neuron activities were recorded in the hindlimb region of the primary somatosensory cortex and part of area 5 in awake Japanese monkeys. A total of 1050 units were isolated from five hemispheres of four animals. Receptive fields (RFs) and submodalities were identified for 90% of isolated neurons in areas 3a and...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/s002210000464
更新日期：2000-09-01 00:00:00
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journal_title：Experimental brain research
pub_type： 杂志文章
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更新日期：1979-03-09 00:00:00
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journal_title：Experimental brain research
pub_type： 杂志文章
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更新日期：1986-01-01 00:00:00
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journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/s00221-010-2414-0
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journal_title：Experimental brain research
pub_type： 杂志文章
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更新日期：2001-01-01 00:00:00
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journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/s002210050719
更新日期：1999-05-01 00:00:00
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journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/BF00247577
更新日期：1988-01-01 00:00:00
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pub_type： 杂志文章
doi：10.1007/s00221-009-1895-1
更新日期：2009-07-01 00:00:00
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journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/s002219900220
更新日期：2000-01-01 00:00:00
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journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/BF00237175
更新日期：1982-01-01 00:00:00
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journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/s00221-015-4544-x
更新日期：2016-06-01 00:00:00
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journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/s00221-006-0380-3
更新日期：2006-08-01 00:00:00
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journal_title：Experimental brain research
pub_type： 临床试验,杂志文章
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更新日期：1999-07-01 00:00:00
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journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/BF00228859
更新日期：1990-01-01 00:00:00
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journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/BF00228882
更新日期：1990-01-01 00:00:00
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journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/BF00227785
更新日期：1993-01-01 00:00:00
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pub_type： 杂志文章
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更新日期：2000-08-01 00:00:00
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pub_type： 杂志文章
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更新日期：1989-01-01 00:00:00
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更新日期：2014-02-01 00:00:00
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journal_title：Experimental brain research
pub_type： 杂志文章
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更新日期：2011-04-01 00:00:00
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journal_title：Experimental brain research
pub_type： 杂志文章,评审
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更新日期：2003-12-01 00:00:00
abstract：:In a previous study we have demonstrated the existence of pulvinar (puv) cells which were optimally activated when a monkey executed reaching movements with his limbs (Acuña et al 1983). We now describe further observations in four Macaca nemestrina monkeys trained to perform goal directed reaching movements aimed at ...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/BF00230847
更新日期：1990-01-01 00:00:00
abstract：:This study investigated whether the execution of an accurate pointing response depends on a prior saccade orientation towards the target, independent of the vision of the limb. A comparison was made between the accuracy of sequential responses (in which the starting position of the hand is known and the eye centred on...
journal_title：Experimental brain research
pub_type： 临床试验,杂志文章
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更新日期：1994-01-01 00:00:00
abstract：:The position of the center of gravity (CG) is a reference value that is controlled by the nervous system during the performance of movements. In order to maintain equilibrium, leg movement is preceded by a shift of the CG towards the supporting side. This CG shift is initiated by an early displacement of the center of...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/s002210050453
更新日期：1998-07-01 00:00:00
