背景:使用事件相关电位(ERP),我们旨在研究左右两侧字母识别任务中的视听整合神经机制。单峰(A,V)和双峰(AV)刺激出现在两侧,与来自单峰的ERP(A,V)同一侧的刺激与同时双峰刺激(AV)的刺激进行比较。AV-(A+V)差异波形的非零结果在左侧/右侧指示视听整合。
结果:当空间相干的AV刺激出现在右侧时,注意到集成差分波中的两个重要的ERP组件。N134和N262,出现在AV-(A+V)积分差波的前300ms,显示出显著的视听整合效果。然而,当这些刺激出现在左侧时,没有重要的集成组件。这种视听整合差异可能源于大脑半球语言处理的左/右不对称性。
结论:右侧显示的视听字母信息更易于集成,process,代表。此外,对于空间非相干的AV刺激,只有一个重要的整合成分在顶叶皮层中达到140ms的峰值,并提供视听多感觉整合,这可以归因于一些整合的神经过程,这些过程取决于听觉和视觉刺激的空间一致性。
BACKGROUND: Using event-related potentials (ERPs), we aimed to investigate audiovisual integration neural mechanisms during a letter identification task in the left and right sides. Unimodal (A,V) and bimodal (AV) stimuli were presented on either side, with ERPs from unimodal (A,V) stimuli on the same side being compared to those from simultaneous bimodal stimuli (AV). Non-zero results of the AV-(A + V) difference waveforms indicated audiovisual integration on the left/right side.
RESULTS: When spatially coherent AV stimuli were presented on the right side, two significant ERP components in the integrated differential wave were noted. The N134 and N262, present in the first 300 ms of the AV-(A + V) integration difference wave, indicated significant audiovisual integration effects. However, when these stimuli were presented on the left side, there were no significant integration components. This audiovisual integration difference may stem from left/right asymmetry of cerebral hemisphere language processing.
CONCLUSIONS: Audiovisual letter information presented on the right side was easier to integrate, process, and represent. Additionally, only one significant integrative component peaked at 140 ms in the parietal cortex for spatially non-coherent AV stimuli and provided audiovisual multisensory integration, which could be attributed to some integrative neural processes that depend on the spatial congruity of the auditory and visual stimuli.