Dissociating Prelexical and Postlexical Processing of Affective Information in the Two Hemispheres: Effects of the Stimulus Presentation Format
Dissociating Prelexical and Postlexical Processing of Affective Information in the Two Hemispheres: Effects of the Stimulus Presentation Format
复制标题
分离两个半球情感信息的词前和词后处理：刺激呈现格式的影响
作者：
S. Windmann;I. Daum;O. Güntürkün
使用词汇决策任务，作者调查了大脑的不对称性，在检测情绪消极的语义关联是否只出现在一个感知的歧视阶段，在这个阶段，词汇分析是准确的，或者已经可以发现在粗糙和不完整的感知表征水平，在这个阶段，词-非词歧视是完全基于猜测。知觉阈值附近的左、右半视野呈现负性和中性项目。词-非词的歧视性能以及偏见分类的刺激作为一个“词”（无论它实际上是一个词）进行了评估，为一个正常的，水平的刺激呈现格式（实验1）和一个不寻常的，垂直的呈现格式（实验2）。结果表明，虽然两个半球同样能够检测到情感语义协会在prelexical处理阶段（两个实验），右半球是上级的postlexical，感知判别阶段（实验2）。此外，研究结果表明，只有一个不寻常的，nonoverlearned刺激演示格式允许适当的评估右半球的词汇语义技能。
Using a lexical decision task, the authors investigated whether brain asymmetries in the detection of emotionally negative semantic associations arise only at a perceptually discriminative stage at which lexical analysis is accurate or can already be found at crude and incomplete levels of perceptual representation at which word-nonword discrimination is based solely on guessing. Emotionally negative and neutral items were presented near perceptual threshold in the left and right visual hemifields. Word-nonword discrimination performance as well as the bias to classify a stimulus as a "word" (whether or not it actually is a word) were assessed for a normal, horizontal stimulus presentation format (Experiment 1) and for an unusual, vertical presentation format (Experiment 2). Results show that while the two hemispheres are equally able to detect affective semantic associations at a prelexical processing stage (both experiments), the right hemisphere is superior at a postlexical, perceptually discriminative stage (Experiment 2). Moreover, the findings suggest that only an unusual, nonoverlearned stimulus presentation format allows adequate assessment of the right hemisphere's lexical-semantic skills.
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