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N1 enhancement in synesthesia during visual and audio-visual perception in semantic cross-modal conflict situations: an ERP study

机译:语义交叉模式冲突情况下视听感知中联觉的N1增强:ERP研究

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摘要

Synesthesia entails a special kind of sensory perception, where stimulation in one sensory modality leads to an internally generated perceptual experience of another, not stimulated sensory modality. This phenomenon can be viewed as an abnormal multisensory integration process as here the synesthetic percept is aberrantly fused with the stimulated modality. Indeed, recent synesthesia research has focused on multimodal processing even outside of the specific synesthesia-inducing context and has revealed changed multimodal integration, thus suggesting perceptual alterations at a global level. Here, we focused on audio-visual processing in synesthesia using a semantic classification task in combination with visually or auditory-visually presented animated and in animated objects in an audio-visual congruent and incongruent manner. Fourteen subjects with auditory-visual and/or grapheme-color synesthesia and 14 control subjects participated in the experiment. During presentation of the stimuli, event-related potentials were recorded from 32 electrodes. The analysis of reaction times and error rates revealed no group differences with best performance for audio-visually congruent stimulation indicating the well-known multimodal facilitation effect. We found enhanced amplitude of the N1 component over occipital electrode sites for synesthetes compared to controls. The differences occurred irrespective of the experimental condition and therefore suggest a global influence on early sensory processing in synesthetes.
机译:联觉需要一种特殊的感官知觉,其中一种感觉方式的刺激会导致另一种而非刺激的感觉方式的内部产生的感知体验。可以将这种现象视为异常的多感官整合过程,因为在此感觉感觉与受刺激的模态异常融合。确实,最近的联觉研究甚至在特定的诱导联觉的环境之外,也将注意力集中在多峰处理上,并揭示了多峰整合的变化,从而暗示了全球范围的知觉改变。在这里,我们集中于使用语义分类任务结合视听或听觉呈现的动画以及在动画对象中以视听一致且不一致的方式进行的语义分类任务,在联觉中进行视听处理。具有听觉-视觉和/或字素-颜色联觉的14名受试者和14名对照受试者参加了该实验。在刺激的呈现过程中,从32个电极记录了与事件相关的电位。反应时间和错误率的分析表明,对于视听一致的刺激,最佳表现没有组差异,这表明了众所周知的多峰促进作用。我们发现,与对照相比,对于联觉麻醉者,枕骨电极部位的N1成分振幅增加。不论实验条件如何,均会发生差异,因此提示对合成物中早期感官加工的整体影响。

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