期刊
JOURNAL OF NEUROSCIENCE
卷 34, 期 14, 页码 5003-5011出版社
SOC NEUROSCIENCE
DOI: 10.1523/JNEUROSCI.3765-13.2014
关键词
audiospatial; Bayesian; connectivity; DCM; EEG; neglect
资金
- Danish Agency for Science, Technology, and Innovation
- Wellcome Trust
- Australian Research Council [FL110100103]
- National Health and Medical Research Council [APP1034110]
- Danish Agency for Science, Technology, and Innovation's University Investment Grant
- Australian Research Council Discovery Early Career Researcher Award [DE130101393]
- Australian Research Council [FL110100103, DE130101393] Funding Source: Australian Research Council
Detecting the location of salient sounds in the environment rests on the brain's ability to use differences in sounds arriving at both ears. Functional neuroimaging studies in humans indicate that the left and right auditory hemispaces are coded asymmetrically, with a rightward attentional bias that reflects spatial attention in vision. Neuropsychological observations in patients with spatial neglect have led to the formulation of two competing models: the orientation bias and right-hemisphere dominance models. The orientation bias model posits a symmetrical mapping between one side of the sensorium and the contralateral hemisphere, with mutual inhibition of the ipsilateral hemisphere. The right-hemisphere dominance model introduces a functional asymmetry in the brain's coding of space: the left hemisphere represents the right side, whereas the right hemisphere represents both sides of the sensorium. We used Dynamic Causal Modeling of effective connectivity and Bayesian model comparison to adjudicate between these alternative network architectures, based on human electroencephalographic data acquired during an auditory location oddball paradigm. Our results support a hemispheric asymmetry in a frontoparietal network that conforms to the right-hemisphere dominance model. We show that, within this frontoparietal network, forward connectivity increases selectively in the hemisphere contralateral to the side of sensory stimulation. We interpret this finding in light of hierarchical predictive coding as a selective increase in attentional gain, which is mediated by feedforward connections that carry precision-weighted prediction errors during perceptual inference. This finding supports the disconnection hypothesis of unilateral neglect and has implications for theories of its etiology.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据