Lexical Ambiguity Resolution Using Discourse Contexts in Persons With and Without Aphasia

Area of Science:

• Linguistics
• Neuroscience
• Psychology

Background:

• Aphasia, a language disorder resulting from brain damage, often impairs language comprehension.
• Lexical ambiguity resolution is crucial for understanding discourse, involving the selection of word meaning based on context.

Purpose of the Study:

• To investigate the capacity of persons with aphasia (PWA) to resolve different types of ambiguous words (homophones, metaphors, metonyms) within discourse contexts.
• To compare the comprehension abilities of PWA with those of neurotypical controls.

Main Methods:

• Participants (6 PWA, 10 controls) listened to discourses biasing dominant or subordinate meanings of ambiguous words.
• Comprehension was assessed via accuracy and reaction time in determining if the final sentence, containing the ambiguity, was coherent with the discourse.

Main Results:

• A significant interaction in accuracy data revealed PWA's relative accuracy with subordinate homophones but relative inaccuracy with subordinate metaphors.
• No significant interaction was found in reaction time data across groups, word types, and frequencies.

Conclusions:

• PWA can leverage discourse context to resolve literal ambiguities (homophones) but face challenges with figurative language (metaphors).
• Further research is needed to determine the specific contextual requirements for PWA to successfully resolve lexical ambiguities.