Attentional selection of relative SF mediates global versus local processing: evidence from EEG.
Attentional selection of relative SF mediates global versus local processing: evidence from EEG.
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DOI：
10.1167/11.7.11
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发表时间：
2011-06-13
影响因子：
1.8
通讯作者：
Robertson LC
中科院分区：
文献类型：
--
作者：
Flevaris AV;Bentin S;Robertson LC
以往的研究认为，视觉加工的功能半球差异与整体知觉和右半球的低空间频率（LSF）加工偏差有关，与局部知觉和左半球的高空间频率（HSF）加工偏差有关。根据频率的双重过滤（DFF）理论扩展了这一假设，提出视觉注意力通过RH选择并定向到相对LSF，通过LH选择并定向到相对HSF，这表明SF选择和全局与局部感知之间存在直接的因果关系。在当前的实验中，我们通过比较右后半球和左后半球记录的EEG中的活动来测试这一想法，而参与者的注意力在选择先前刺激中的相对LSF与HSF之后被引导到全局或局部水平的处理。在准备全局与局部处理的过程中，α频带（8-12 Hz）中的半球不对称性由所选SF调制。相比之下，与选择SF相关的准备活动不受先前参加的级别（全球/当地）的影响。这些结果支持DFF理论，即SF的自上而下的注意选择介导了整体和局部加工。
Previous research on functional hemispheric differences in visual processing has associated global perception with low spatial frequency (LSF) processing biases of the right hemisphere (RH) and local perception with high spatial frequency (HSF) processing biases of the left hemisphere (LH). The Double Filtering by Frequency (DFF) theory expanded this hypothesis by proposing that visual attention selects and is directed to relatively LSFs by the RH and relatively HSFs by the LH, suggesting a direct causal relationship between SF selection and global versus local perception. We tested this idea in the current experiment by comparing activity in the EEG recorded at posterior right and posterior left hemisphere sites while participants’ attention was directed to global or local levels of processing after selection of relatively LSFs versus HSFs in a previous stimulus. Hemispheric asymmetry in the alpha band (8–12 Hz) during preparation for global versus local processing was modulated by the selected SF. In contrast, preparatory activity associated with selection of SF was not modulated by the previously attended level (global/local). These results support the DFF theory that top-down attentional selection of SF mediates global and local processing.
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