Faculty of Human Life and Environment, Nara Women's University, Nara, Japan.
Faculty of Engineering, Nara Women's University, Kitauoya-Nishi Machi, Nara, 630-8506, Japan.
Sci Rep. 2023 Apr 15;13(1):6172. doi: 10.1038/s41598-023-32389-8.
Grapheme-color synesthesia is a consistent and automatic perception of non-physical color when presented with a grapheme. Many previous studies focused on the synesthetic visual system, but other cognitive functions in grapheme-color synesthetes have remained unclear. Therefore, the objective of the present study was to investigate the characteristics of cognitive processing for motor execution and inhibition during Go/No-go paradigms in grapheme-color synesthesia using event-related potentials (ERPs). Six grapheme-color synesthetes and 24 non-synesthetes performed visual, auditory, and somatosensory Go/No-go paradigms. Omission errors were higher in grapheme-color synesthetes than non-synesthetes. Group-trial interactions (i.e., synesthetes-non-synesthetes × Go-No-go) were observed for the latency of the visual N2 component and amplitude of the somatosensory N2 component. Latencies of auditory and somatosensory P3 components were shorter in grapheme-color synesthetes than non-synesthetes. These findings suggest that grapheme-color synesthetes have specific cognitive processing in motor execution and inhibition as well as synesthetic color perception. Our data advance understanding of cognitive processing in grapheme-color synesthesia.
文字-颜色联觉是指在呈现文字时，会产生一致且自动的非物理颜色感知。许多先前的研究都集中在联觉视觉系统上，但文字-颜色联觉者的其他认知功能仍不清楚。因此，本研究的目的是使用事件相关电位（ERP）研究文字-颜色联觉者在 Go/No-go 范式中运动执行和抑制的认知加工特征。6 名文字-颜色联觉者和 24 名非联觉者进行了视觉、听觉和体感 Go/No-go 范式。与非联觉者相比，文字-颜色联觉者的遗漏错误更高。组试验相互作用（即联觉者-非联觉者×Go-No-go）观察到视觉 N2 成分的潜伏期和体感 N2 成分的振幅。听觉和体感 P3 成分的潜伏期在文字-颜色联觉者中更短。这些发现表明，文字-颜色联觉者在运动执行和抑制以及联觉颜色感知方面具有特定的认知加工。我们的数据增进了对文字-颜色联觉认知加工的理解。
