Abstract：
:We investigated the effect of spatial uncertainty on motor planning by using the cueing method in a reaching task (experiment 1). Discrete spatial cues indicated the different locations in which the target could be presented. The number of cues as well as their direction changed from trial to trial. We tested the adequacy of two models of motor planning to account for the data. The switching model assumes that only one motor response can be planned at a time, whereas the capacity-sharing model assumes that multiple motor responses can be planned in parallel. Both models predict the same relation between average reaction time (RT) and number of cues, but they differ in their prediction of the shape of the distribution of the reaction time. The results showed that RT increased with the number of cues independently from their spatial dispersion. This relation was well described by the function predicted by both models, whereas it was poorly described by the Hick-Hyman law. In addition, the distribution of RT conformed to the prediction of the capacity-sharing model and not to that of the switching model. We investigated the role that the requirement of a spatially directed motor response might have had on this pattern of results by testing subjects in a simple RT task (experiment 2) with the same cueing presentation as in experiment 1. The results contrasted with those in experiment 1 and showed that RT was dependent on the spatial dispersion of the cues and not on their number. The results of the two experiments suggest that the mode of processing of potential targets is dependent on the spatial constraints of the task. The processing resources can be either divided relative to the spatial distribution of possible targets or across multiple independent discrete representations of these targets.
journal_name
Exp Brain Resjournal_title
Experimental brain researchauthors
Pellizzer G,Hedges JHdoi
10.1007/s00221-003-1453-1keywords:
subject
Has Abstractpub_date
2003-06-01 00:00:00pages
276-89issue
3eissn
0014-4819issn
1432-1106journal_volume
150pub_type
杂志文章abstract：:The present study characterizes expression of calbindin D28K (CB-D28K) and parvalbumin (PV) in ventral forebrain (VFB) grafts placed in the neocortex of adult rats bearing quisqualic acid lesions to the nucleus basalis magnocellularis. Three to nine months after transplantation surgery, rats were killed for in situ hy...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/s002210050311
更新日期：1998-02-01 00:00:00
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journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/s00221-006-0563-y
更新日期：2006-11-01 00:00:00
abstract：:Anticipatory pursuit is not exclusively based on the recent history of target motion ("temporal anticipation"): it can also use static visual cues ("non-temporal anticipation"). Large non-temporal anticipatory changes of the direction of smooth pursuit are observed when the future trajectory of the target can be infer...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/s00221-009-1840-3
更新日期：2009-06-01 00:00:00
abstract：:Prevention of testosterone aromatization in the female rat pups by perinatal treatment with 1,4,6 androstatriene-3,17-dione (ATD) induces an important defeminization as shown by a reduction of fluctuations of LH release after castration and estradiol implantation. The fact that, under our in vitro experimental conditi...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/BF00340477
更新日期：1986-01-01 00:00:00
abstract：:Cultured olfactory bulb cells from embryonic mice had ultrastructural characteristics similar to those of many cell types in the intact adult mouse olfactory bulb. Identified cultured cells included mitral/tufted cells, granule cells, short-axon cells, and fibrous and protoplasmic astrocytes. Cultured neurons were fou...
journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/BF02738402
更新日期：1994-01-01 00:00:00
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journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/s002210050827
更新日期：1999-09-01 00:00:00
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journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/BF00235574
更新日期：1978-11-15 00:00:00
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journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/s00221-006-0537-0
更新日期：2006-10-01 00:00:00
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journal_title：Experimental brain research
pub_type： 临床试验,杂志文章,随机对照试验
doi：10.1007/BF00241503
更新日期：1995-01-01 00:00:00
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journal_title：Experimental brain research
pub_type： 临床试验,杂志文章
doi：10.1007/s00221-003-1541-2
更新日期：2003-08-01 00:00:00
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journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/s00221-012-3007-x
更新日期：2012-04-01 00:00:00
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journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/BF00228525
更新日期：1991-01-01 00:00:00
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journal_title：Experimental brain research
pub_type： 临床试验,杂志文章
doi：10.1007/s002210050274
更新日期：1998-01-01 00:00:00
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journal_title：Experimental brain research
pub_type： 杂志文章,随机对照试验
doi：10.1007/s00221-014-3843-y
更新日期：2014-04-01 00:00:00
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journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/s002210050219
更新日期：1997-11-01 00:00:00
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journal_title：Experimental brain research
pub_type： 临床试验,杂志文章
doi：10.1007/s002210050262
更新日期：1998-01-01 00:00:00
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journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/BF00241368
更新日期：1996-06-01 00:00:00
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journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/s002210100762
更新日期：2001-07-01 00:00:00
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journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/BF00235537
更新日期：1983-01-01 00:00:00
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journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/BF02259147
更新日期：1992-01-01 00:00:00
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journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/s002210000429
更新日期：2000-08-01 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：1996-09-01 00:00:00
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journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/BF00236282
更新日期：1984-01-01 00:00:00
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journal_title：Experimental brain research
pub_type： 杂志文章,随机对照试验
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更新日期：2019-07-01 00:00:00
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journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/s00221-008-1330-z
更新日期：2008-06-01 00:00:00
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journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/s00221-015-4260-6
更新日期：2015-06-01 00:00:00
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journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/s00221-015-4240-x
更新日期：2015-05-01 00:00:00
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journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/s00221-020-05802-1
更新日期：2020-08-01 00:00:00
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journal_title：Experimental brain research
pub_type： 杂志文章,评审
doi：10.1007/s00221-009-1834-1
更新日期：2009-06-01 00:00:00
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journal_title：Experimental brain research
pub_type： 杂志文章
doi：10.1007/s00221-011-2970-y
更新日期：2012-03-01 00:00:00
