Transcranial direct current stimulation over posterior parietal cortex modulates visuospatial localization

被引:24
|
作者
Wright, Jessica M. [1 ]
Krekelberg, Bart [1 ]
机构
[1] Rutgers State Univ, Ctr Mol & Behav Neurosci, Newark, NJ 07102 USA
来源
JOURNAL OF VISION | 2014年 / 14卷 / 09期
基金
美国国家卫生研究院;
关键词
visual localization; spatial attention; transcranial electrical stimulation; interhemispheric competition; position perception; DC BRAIN POLARIZATION; EYE-POSITION SIGNALS; HUMAN MOTOR CORTEX; SPATIAL ATTENTION; RELATIVE MISLOCALIZATION; VISUAL-ATTENTION; EXCITABILITY; NEGLECT; MECHANISMS; LOCATION;
D O I
10.1167/14.9.5
中图分类号
R77 [眼科学];
学科分类号
100212 ;
摘要
Visual localization is based on the complex interplay of bottom-up and top-down processing. Based on previous work, the posterior parietal cortex (PPC) is assumed to play an essential role in this interplay. In this study, we investigated the causal role of the PPC in visual localization. Specifically, our goal was to determine whether modulation of the PPC via transcranial direct current stimulation (tDCS) could induce visual mislocalization similar to that induced by an exogenous attentional cue (Wright, Morris, & Krekelberg, 2011). We placed one stimulation electrode over the right PPC and the other over the left PPC (dual tDCS) and varied the polarity of the stimulation. We found that this manipulation altered visual localization; this supports the causal involvement of the PPC in visual localization. Notably, mislocalization was more rightward when the cathode was placed over the right PPC than when the anode was placed over the right PPC. This mislocalization was found within a few minutes of stimulation onset, it dissipated during stimulation, but then resurfaced after stimulation offset and lasted for another 10-15 min. On the assumption that excitability is reduced beneath the cathode and increased beneath the anode, these findings support the view that each hemisphere biases processing to the contralateral hemifield and that the balance of activation between the hemispheres contributes to position perception (Kinsbourne, 1977; Szczepanski, Konen, & Kastner, 2010).
引用
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页数:15
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