Suppr超能文献

腹侧和背侧通路对即时和延迟抓握在线控制的贡献:一项经颅磁刺激研究

Ventral and dorsal stream contributions to the online control of immediate and delayed grasping: a TMS approach.

作者信息

Cohen Nichola Rice, Cross Emily S, Tunik Eugene, Grafton Scott T, Culham Jody C

机构信息

Department of Psychological and Brain Sciences, Dartmouth College, Hanover, NH 03755, USA.

出版信息

Neuropsychologia. 2009 May;47(6):1553-62. doi: 10.1016/j.neuropsychologia.2008.12.034. Epub 2009 Jan 6.

Abstract

According to Milner and Goodale's theory of the two visual streams, the dorsal (action) stream controls actions in real-time, whereas the ventral (perceptual) stream stores longer-term information for object identification. By this account, the dorsal stream subserves actions carried out immediately. However, when a delay is required before the response, the ventral (perceptual) stream is recruited. Indeed, a neuroimaging study from our lab has found reactivation of an area within the ventral stream, the lateral occipital (LO) cortex, at the time of action even when no visual stimulus was present. To tease apart the contribution of specific areas within the dorsal and ventral streams to the online control of grasping under immediate and delayed conditions, we used transcranial magnetic stimulation (TMS) to the anterior intraparietal sulcus (aIPS) and to LO. We show that while TMS to aIPS affected grasp under both immediate and delayed conditions, TMS to LO influenced grasp only under delayed movement conditions. The effects of TMS were restricted to early movement kinematics (i.e. within 300 ms) due to the transient nature of TMS, which was always delivered simultaneous with movement onset. We discuss the implications of our findings in relation to interactions between the dorsal and ventral streams.

摘要

根据米尔纳和古德尔的双视觉流理论,背侧(动作)流实时控制动作,而腹侧(感知)流存储用于物体识别的长期信息。据此,背侧流有助于立即执行的动作。然而,当在反应前需要延迟时,腹侧(感知)流会被调用。事实上,我们实验室的一项神经影像学研究发现,即使在没有视觉刺激的情况下,腹侧流中的一个区域——枕外侧(LO)皮层,在动作执行时也会重新激活。为了区分背侧流和腹侧流中特定区域对即时和延迟条件下抓握在线控制的贡献,我们对顶内沟前部(aIPS)和LO进行了经颅磁刺激(TMS)。我们发现,虽然对aIPS的TMS在即时和延迟条件下都会影响抓握,但对LO的TMS仅在延迟运动条件下影响抓握。由于TMS的短暂性,其效应仅限于早期运动运动学(即300毫秒内),TMS总是与运动开始同时施加。我们讨论了我们的发现对背侧流和腹侧流之间相互作用的影响。

文献AI研究员

20分钟写一篇综述,助力文献阅读效率提升50倍。

立即体验

用中文搜PubMed

大模型驱动的PubMed中文搜索引擎

马上搜索

文档翻译

学术文献翻译模型,支持多种主流文档格式。

立即体验