Department of Psychology, Normal College & School of Teacher Education, Qingdao University, Qingdao, China.
Qingdao West Coast New Area Hospital of Traditional Chinese Medicine, Qingdao, China.
Int J Psychophysiol. 2022 Aug;178:43-50. doi: 10.1016/j.ijpsycho.2022.06.005. Epub 2022 Jun 10.
The present study measured event-related potentials (ERP) and behavioral performance to examine whether inhibitory control is involved in voluntary language switching, and if so, to explore the differences in inhibitory control between voluntary and mandatory language switching. Unbalanced Chinese-English bilinguals completed two picture naming tasks: one involving mandatory language switches and one in which participants could voluntarily switch between the two languages. Behavioral data showed significant switch costs and a reversed language dominance effect in both switching tasks. Critically, both effects were larger in mandatory compared to voluntary switching. ERP results revealed that neural switch costs during mandatory switching was significantly different than voluntary switching in both N2 and LPC amplitudes. In contrast, a significant difference in the reversed language dominance effect between both tasks was only observed in LPC amplitude. Together, these findings suggest the involvement of inhibitory control in both mandatory and voluntary language switching, but the degree of inhibition and the time-course of control processes between both tasks appear to be distinct.
本研究通过测量事件相关电位（ERP）和行为表现来考察抑制控制是否参与了自愿语言转换，如果是这样，那么就需要进一步探索自愿语言转换和强制性语言转换之间的抑制控制差异。非平衡汉英双语者完成了两项图片命名任务：一项任务涉及强制性语言转换，另一项任务中参与者可以在两种语言之间自愿切换。行为数据显示，在两种转换任务中都出现了显著的转换代价和反向语言优势效应。关键的是，强制性转换任务中的这两种效应都比自愿转换任务中的更大。ERP 结果表明，在强制性转换中，N2 和 LPC 振幅的神经转换代价与自愿转换显著不同。相比之下，在两种任务的反向语言优势效应中仅观察到 LPC 振幅存在显著差异。总的来说，这些发现表明抑制控制参与了强制性和自愿语言转换，但两种任务之间的抑制程度和控制过程的时间进程似乎不同。
