结合稳态视觉诱发电位和 fMRI 定位选择性注意时的大脑活动。

Combining steady-state visual evoked potentials and f MRI to localize brain activity during selective attention.

机构信息

Department of Neurosciences, University of California, San Diego, La Jolla, California 92093, USA.

出版信息

Hum Brain Mapp. 1997;5(4):287-92. doi: 10.1002/(SICI)1097-0193(1997)5:4<287::AID-HBM14>3.0.CO;2-B.

DOI:10.1002/(SICI)1097-0193(1997)5:4<287::AID-HBM14>3.0.CO;2-B

PMID:20408230

Abstract

Brain activity was studied with fMRI and steady-state visual evoked potentials (SSVEPs) in separate sessions as subjects attended to letter sequences in either the right or left visual field. The two letter sequences were superimposed on small square backgrounds that flickered at 8.6 and 12.0 Hz, respectively, and elicited SSVEPs at the flicker frequencies. The amplitude of the frequency-coded SSVEP elicited by either of the flickering backgrounds was enlarged when attention was focused upon the letter sequence at the same location. Source analysis of the SSVEP waveforms localized the attentional modulation to ventral and lateral extrastriate visual cortex, which corresponded to zones of activation observed with fMRI.

摘要

在分别的实验中，研究人员通过 fMRI 和稳态视觉诱发电位（SSVEPs）研究了大脑活动，此时被试者注视着分别出现在左右视野中的字母序列。这两个字母序列分别叠加在闪烁频率为 8.6Hz 和 12.0Hz 的小正方形背景上，并分别诱发出 SSVEPs。当注意力集中在相同位置的字母序列上时，由任何一个闪烁背景引起的频率编码 SSVEP 的振幅都会增大。对 SSVEP 波形的源分析将注意力调节定位到腹侧和外侧外纹状皮层，这与 fMRI 观察到的激活区域相对应。