Facilitated lexical ambiguity processing by transcranial direct current stimulation over the left inferior frontal...

Area of Science:

• Neuroscience
• Cognitive Science
• Psycholinguistics

Background:

• The left inferior frontal cortex (LIFC) plays a crucial role in resolving lexical ambiguities during language comprehension.
• Understanding how to modulate LIFC activity for improved semantic processing is an ongoing area of research.

Purpose of the Study:

• To investigate whether enhancing the excitability of the LIFC using anodal transcranial direct current stimulation (tDCS) improves the processing of lexically ambiguous words.
• To examine the effects of tDCS on behavioral measures of semantic judgment in context.

Main Methods:

• Anodal tDCS was applied over the LIFC in a within-subjects design.
• Participants performed semantic judgment tasks on lexically ambiguous and unambiguous words presented within a specific context.
• Reaction times (RT) were recorded as the primary behavioral index.

Main Results:

• Reaction times for semantic judgments were significantly shorter for ambiguous words during the anodal tDCS session compared to the sham (placebo) session.
• No significant difference in RT was observed for unambiguous words between conditions.

Conclusions:

• Anodal tDCS over the LIFC facilitates the processing of lexical ambiguities.
• These findings suggest that non-invasive brain stimulation can enhance controlled semantic retrieval and contextual selection mechanisms in language comprehension.