ABSTRACT

Previous research suggests that the right visual field advantage on the lexical decision task occurs independent of the visual quality of stimuli [Chiarello, C., Senehi, J., & Soulier, M. (1986). Viewing conditions and hemisphere asymmetry for the lexical decision. Neuropsychologia, 24(4), 521–529]. However, previous studies examining these effects have had methodological limitations that were addressed and controlled for in the present study. Participants performed a divided visual field, lexical decision task for words that varied in size (Experiment 1) and visibility (Experiment 2). Results showed a quality by visual field interaction effect. In both experiments, response times were faster for targets presented to the right visual field in the high quality (i.e., large font, high visibility) conditions; however, visual quality resulted in no differences for targets presented to the left visual field. Furthermore, this quality by visual field interaction effect was only observed when the target was a word. These results suggest that the left hemisphere advantage for lexical decision depends on the perceptual quality of targets, consistent with an early stage of processing account of hemispheric asymmetry during lexical decision. Findings are discussed within the context of word recognition and decision-based models.

摘要

先前的研究表明，词汇决策任务上正确的视野优势的发生与刺激物的视觉质量无关[Chiarello，C.，Senehi，J.，＆Soulier，M.（1986）。查看条件和词汇决策的半球不对称性。神经心理学，24（4），521–529]。但是，先前研究这些效果的研究具有方法学上的局限性，本研究已解决和控制了这些局限性。参与者针对大小（实验1）和可见度（实验2）不同的单词执行了划分视野，词汇决策任务。结果显示了通过视野相互作用产生的质量效应。在这两个实验中，在高质量（即大字体，高可见性）条件下，呈现给正确视野的目标的响应时间都更快。然而，视觉质量导致呈现给左视野的目标没有差异。此外，仅当目标是单词时，才能观察到这种通过视野交互作用产生的效果。这些结果表明，词汇决策的左半球优势取决于目标的感知质量，这与词汇决策过程中半球不对称的早期处理有关。在单词识别和基于决策的模型的上下文中讨论了发现。