Metaphor processing is influenced by stimulus emotionality and task demands: Evidence from ERPs

Area of Science:

• Cognitive Neuroscience
• Psycholinguistics
• Neuroscience of Language

Background:

• Metaphorical language processing demands greater cognitive-neural resources compared to literal language.
• Event-related potentials (ERPs) like N400, late positivity (LP), and late negativity (LN) have been used to study these differences.
• The influence of stimulus emotionality and task demands on these neural correlates remains underexplored.

Purpose of the Study:

• To investigate how stimulus emotionality and task demands modulate the event-related potential (ERP) correlates of metaphor comprehension.
• To determine the interplay between emotional content, task requirements, and neural processing of metaphorical versus literal expressions.

Main Methods:

• Two experiments were conducted using event-related potentials (ERPs).
• Experiment 1: Participants performed a sensicality judgment task on emotional/neutral metaphorical/literal sentences.
• Experiment 2: Participants passively read sentences, with comprehension verified by occasional questions.

Main Results:

• Emotional metaphors, compared to emotional literal sentences, elicited a widespread N400 effect and a left-anterior late negativity (LN) in Experiment 1.
• In Experiment 2, emotional metaphors evoked a more positive late positivity (LP) than emotional literal sentences.
• Findings suggest that both emotionality and task demands influence the neural resources engaged in metaphor processing.

Conclusions:

• Stimulus emotionality and task demands interact to shape the neural processing of metaphors.
• These factors co-determine the recruitment of emotion- and semantic-related neural networks during comprehension.
• Understanding these influences is crucial for a comprehensive model of figurative language processing.