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在人类早期视觉皮层的子部分中,稳定状态视觉唤起磁场 (SSVEF) 的空间注意力调制的明显模式

Stephan Moratti^1,2, Christopher Gundlach³, Javier de Echegaray³

¹Department of Experimental Psychology, Complutense University of Madrid, Madrid, Spain.

Psychophysiology

|October 3, 2023

概括

稳态视觉唤起潜能 (SSVEP) 对于研究注意力是有用的. 这项研究使用MEG将SSVEP注意力效应映射到早期视觉皮层区域,揭示了不同的激活模式.

科学领域:

神经科学是一个神经科学.
认知神经科学认知神经科学
视觉感知视觉感知视觉感知

背景情况:

稳态视觉唤起潜能 (SSVEP) 越来越多地用于研究注意力相互作用和脑计算机接口,因为它们的信号噪声比高,并且适合分析时间动态.
尽管SSVEP很受欢迎,但对它们的皮质源的研究,特别是对注意力振幅调制的研究,仍然有限.
了解SSVEP的神经基础对于推进注意力和脑计算机接口应用的研究至关重要.

研究的目的:

在空间注意任务期间调查注意力SSVEP振幅调制的皮质来源.
绘制与视觉皮层中注意力部署和抑制相关的SSVEP反应的神经发生器.
在视觉处理层次结构中,区分注意力对被关注与被忽视的刺激的影响.

主要方法:

使用磁脑摄影 (MEG) 在空间注意力任务期间记录神经磁场.
在左和右视野中呈现频率标记的刺激,以引起SSVEPs.
通过让受试者关注一个中央固定交叉或两个外围刺激来操纵注意力焦点,并控制了基线注意力部署.

主要成果:

识别的信号源和注意力效应主要在早期视觉皮层内,包括V1,V2,hMT+, precuneus,occipito-parietal和下皮层.
将注意力从中心固定转移到外围刺激,增加了hMT+和下皮层中被关注的刺激的激活,同时降低了V1中的SSVEPs到角-角皮层.
转移注意力远离以前参加的刺激导致现在被忽视的刺激在所有已识别的区域的激活率下降.

结论:

SSVEP的注意调节主要局限于早期视觉处理区域.
这些发现提供了对视觉皮层内注意力促进和抑制背后的神经机制的见解.
这项研究有助于更好地了解SSVEP的皮质基础及其在认知神经科学中的应用.

关键词:

在MEG MEG中,我们可以使用MEG.皮层来源皮层来源空间上的注意力稳定状态视觉唤起的反应.

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