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Published on: June 30, 2020
Language learning without control: the role of the PFC.
Angela D Friederici1, Jutta L Mueller, Bernhard Sehm
1Max Planck Institute for Human Cognitive and Brain Sciences, Leipzig, Germany. angelafr@cbs.mpg.de
Adults can learn languages using different brain mechanisms. Inhibiting the prefrontal cortex (PFC) during learning shifts adult language acquisition from lexical to associative processes, similar to infants.
Area of Science:
- Neuroscience
- Cognitive Science
- Psycholinguistics
Background:
- Language learning capabilities change throughout life, influenced by the maturation of the prefrontal cortex (PFC).
- The PFC plays a crucial role in cognitive control, impacting how adults learn compared to infants.
Purpose of the Study:
- To investigate how inhibiting the PFC affects adult language learning mechanisms.
- To compare learning processes in adults under normal cognitive control versus downregulated PFC activity.
Main Methods:
- Adults underwent a novel language learning task with grammatical dependencies.
- Cathodal transcranial direct current stimulation (tDCS) was applied over the left PFC, right PFC, or sham during a learning phase.
- Event-related potentials (ERPs) were recorded during learning and subsequent testing.
Main Results:
- Behavioral learning success was equivalent across all stimulation conditions.
- ERPs during testing revealed different learning effects based on prior PFC stimulation.
- Sham stimulation showed lexical processing (N400-like negativity), while left PFC inhibition revealed associative learning (late positivity), akin to infants.
Conclusions:
- Adults utilize distinct learning mechanisms depending on PFC cognitive control.
- Downregulating PFC activity promotes associative learning in adults, mirroring infant learning.
- This suggests cognitive control modulates the reliance on lexical versus associative processes in adult language acquisition.
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