A magnetic stimulation examination of orthographic neighborhood effects in visual word recognition
A magnetic stimulation examination of orthographic neighborhood effects in visual word recognition
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DOI：
10.1162/089892903321593081
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发表时间：
2003-04-01
影响因子：
3.2
通讯作者：
Walsh, V
中科院分区：
文献类型：
--
作者：
Lavidor, M;Walsh, V
中央凹分裂理论认为视觉单词识别是通过中央凹图像的分裂来介导的，注视点左侧的字母投射到右半球（RH），注视点右侧的字母投射到左半球（LH）。在词汇判断任务中，我们应用重复经颅磁刺激（rTMS）在左侧和右侧枕叶皮层，以调查在何种程度上，他可以解释根据分裂中心凹理论的单词识别过程。单侧rTMS显着受损词汇决策lavelet集中呈现的话，支持的建议，中央凹代表的话是分裂的大脑半球，而不是双边的。行为上，我们发现，单词有许多正字法邻居共享相同的首字母（“铅邻居”）促进词汇决策比单词与几个铅邻居。此效果不适用于末端相邻字母（共享相同末端字母的正交相邻字母）。至关重要的是，rTMS在RH受损的铅，但不是端邻促进。研究结果支持分裂中心凹理论，RH在代表一个书面单词的铅邻居的首要地位。
The split-fovea theory proposes that visual word recognition is mediated by the splitting of the foveal image, with letters to the left of fixation projected to the right hemisphere (RH) and letters to the right of fixation projected to the left hemisphere (LH). We applied repetitive transcranial magnetic stimulation (rTMS) over the left and right occipital cortex during a lexical decision task to investigate the extent to which word recognition processes could he accounted for according to the split-fovea theory. Unilateral rTMS significantly impaired lexical decision latencies to centrally presented words, supporting the suggestion that foveal representation of words is split between the cerebral hemispheres rather than bilateral. Behaviorally, we showed that words that have many orthographic neighbors sharing the same initial letters ("lead neighbors") facilitated lexical decision more than words with few lead neighbors. This effect did not apply to end neighbors (orthographic neighbors sharing the same final letters). Crucially, rTMS over the RH impaired lead-, but not end-neighborhood facilitation. The results support the split-fovea theory, where the RH has primacy in representing lead neighbors of a written word.