CTB公司
角回
心理学
颞中回
颞顶交界
颞上回
神经科学
演讲制作
认知心理学
顶叶
认知
刺激
功能磁共振成像
运动皮层
前额叶皮质
初级运动皮层
计算机科学
语音识别
作者
Polina Timofeeva,Alessandra Finisguerra,Giulia D’Argenio,Adolfo M. García,Manuel Carreiras,Ileana Quiñones,Cosimo Urgesi,Lucía Amoruso
标识
DOI:10.1093/cercor/bhae188
摘要
Abstract The role of the left temporoparietal cortex in speech production has been extensively studied during native language processing, proving crucial in controlled lexico-semantic retrieval under varying cognitive demands. Yet, its role in bilinguals, fluent in both native and second languages, remains poorly understood. Here, we employed continuous theta burst stimulation to disrupt neural activity in the left posterior middle-temporal gyrus (pMTG) and angular gyrus (AG) while Italian–Friulian bilinguals performed a cued picture-naming task. The task involved between-language (naming objects in Italian or Friulian) and within-language blocks (naming objects [“knife”] or associated actions [“cut”] in a single language) in which participants could either maintain (non-switch) or change (switch) instructions based on cues. During within-language blocks, cTBS over the pMTG entailed faster naming for high-demanding switch trials, while cTBS to the AG elicited slower latencies in low-demanding non-switch trials. No cTBS effects were observed in the between-language block. Our findings suggest a causal involvement of the left pMTG and AG in lexico-semantic processing across languages, with distinct contributions to controlled vs. “automatic” retrieval, respectively. However, they do not support the existence of shared control mechanisms within and between language(s) production. Altogether, these results inform neurobiological models of semantic control in bilinguals.
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