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首页> 外文期刊>Journal of Cognitive Neuroscience >Brain Activity Underlying Mental Imagery: Event-related Potentials During Mental Image Generation
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Brain Activity Underlying Mental Imagery: Event-related Potentials During Mental Image Generation

机译：心理活动背后的大脑活动：心理图像生成过程中与事件相关的潜力。

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This article addresses two issues about the neural bases of mental imagery. The first issue concerns the modality-specificity of mental images, that is, whether or not they involve activity in visual areas of the brain. The second issue concerns hemispheric specialization for the generation of mental images. We compared event-related potentials recorded under two conditions: one in which subjects were shown words and asked to read them and one in which subjects were shown words and asked to read them and generate visual mental images of the words' referents. Imagery caused a slow, late positivity, maximal at the occipital and posterior temporal regions of the scalp, relative to the comparison condition, and consistent with the involvement of modality-specific visual cortex in mental imagery. Also noted was an asymmetry in the imagery-related ERP, consistent with left-hemisphere specialization for mental image generation. Similar results were obtained when subjects listened to auditorily presented words with and without instructions to generate mental images. To assess the specificity of the relation between these ERP effects and mental imagery, we compared the ERP changes brought about by imaging with those brought about by another effortful task using the same stimulus words: proofreading the words for occasional misspellings. This produced changes that differed in polarity, time course, and scalp distribution from the imagery-related changes.
机译：本文讨论有关心理图像神经基础的两个问题。第一个问题涉及心理图像的形式特异性，即它们是否涉及大脑视觉区域的活动。第二个问题涉及大脑图像生成的半球专业化。我们比较了在两种情况下记录的与事件相关的电位：一种情况下，向受试者显示单词并要求阅读它们，而另一种情况下，向受试者显示单词并要求阅读它们，并生成单词所指对象的视觉心理图像。相对于比较条件，影像学引起的迟发性，阳性阳性率最高，相对于比较条件，在头皮的枕骨和后颞区最大，并且与心理影像中特定于形态的视觉皮层的参与一致。还注意到与图像相关的ERP中存在不对称性，这与用于心理图像生成的左半球专门化相一致。当受试者在听或不听的情况下听取听觉呈现的单词以生成心理图像时，也获得了类似的结果。为了评估这些ERP效果与心理意象之间关系的特殊性，我们比较了由影像带来的ERP变化与使用相同刺激词的另一项艰巨任务带来的变化：校对偶尔出现的拼写错误的单词。这产生了极性，时程和头皮​​分布与图像相关变化不同的变化。

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