Human brain activity related to speed discrimination tasks

Human brain activity related to speed discrimination tasks
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与速度辨别任务相关的人脑活动

DOI:
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发表时间:
1998
影响因子:
2
通讯作者:
L. Mortelmans
L. Mortelmans
中科院分区:
医学4区
文献类型:
--
作者:
G. Orban;P. Dupont;B. De Bruyn;R. Vandenberghe;A. Rosier;L. Mortelmans

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摘要:使用正电子发射断层扫描(PET)测量人脑的局部脑血流(rCBF)模式,同时受试者观察、检测、判断移动随机点模式(RDP)的速度或比较连续 RDP 的速度。在所有四种情况下,视网膜输入都是相同的。还包括两个附加条件,即连续呈现移动 RDP 和静止 RDP,以识别人类 MT/V5 (hMT/V5)。两项速度辨别任务都涉及右楔叶和右舌回,并在较小程度上涉及左舌回和右半球的更前舌区。然而,在任一速度判别过程中,hMT/V5 几乎没有或没有差异活性。两个速度判别任务的直接比较显示,右中梭状回的活动较高,这一结果让人想起早期研究中使用方位和方向作为判别属性所获得的结果。这些结果证实了人类视觉皮层的处理是任务依赖性的,并强调了中梭状回在简单属性的时间比较中的作用。
Abstract The regional cerebral blood-flow (rCBF) pattern of the human brain was measured using positron emission tomography (PET) while subjects viewed, detected, judged the speed of a moving random dot pattern (RDP) or compared speeds of successive RDPs. In all four conditions, retinal input was identical. Two additional conditions, continuous presentation of a moving and a stationary RDP, were included to identify human MT/V5 (hMT/V5). Both speed discrimination tasks involved the right cuneus and right lingual gyrus and to a lesser degree the left lingual gyrus and a more anterior lingual region in the right hemisphere. There was, however, little or no differential activity over hMT/V5 during either speed discrimination. Direct comparison of the two speed discrimination tasks revealed higher activity in the right middle fusiform gyrus, a result reminiscent of that obtained in earlier studies using orientation and direction as the attribute to be discriminated. These results confirm that processing in the human visual cortex is task dependent and underscore the role of the middle fusiform gyrus in temporal comparison of simple attributes.
DOI: 10.1152/jn.1984.52.6.1106
发表时间: 1984-01-01
影响因子: 2.5
作者:
ALBRIGHT, TD
通讯作者: ALBRIGHT, TD
DOI: 10.1073/pnas.87.3.1134
发表时间: 1990-02
影响因子: 11.1
作者:
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DOI: 10.1152/jn.1997.78.1.516
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DOI: 10.1093/cercor/7.3.193
发表时间: 1997-04-01
期刊: CEREBRAL CORTEX
影响因子: 3.7
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通讯作者: Petersen, SE