Metaphorical language processing and amygdala activation in L1 and L2

Area of Science:

• Neuroscience
• Psycholinguistics
• Second Language Acquisition

Background:

• Figurative language, particularly metaphors, presents unique processing challenges.
• Understanding the neural basis of metaphor comprehension in native versus non-native speakers is crucial for psycholinguistic research.

Purpose of the Study:

• To investigate the neural correlates of processing conventional figurative language in non-native speakers compared to native speakers.
• To examine how increasing metaphoricity affects brain activation in both groups.

Main Methods:

• Functional magnetic resonance imaging (fMRI) was used to compare brain activity.
• Italian proficient L2 learners of German and German native speakers processed metaphorical statements and literal paraphrases.
• Stimuli were controlled for psycholinguistic variables.

Main Results:

• Native speakers demonstrated increased brain activation for metaphor processing, with heightened left amygdala activity correlating with metaphoricity.
• L2 learners showed overall differences in the fronto-temporal network compared to native speakers.
• L2 speakers displayed limited distinctive activation beyond the caudate nucleus as metaphoricity increased, unlike native speakers.

Conclusions:

• Metaphorical language appears more engaging for native speakers than for L2 learners.
• Neural processing of metaphoricity differs significantly between native and non-native speakers.
• Findings suggest L2 learners may rely on different or less specialized neural mechanisms for metaphor comprehension.