The effects of homonymy and polysemy on lexical access: An MEG study

Alan Beretta, Robert Fiorentino, David Poeppel

Research output: Contribution to journalArticle

Abstract

We examined the neural correlates of semantic ambiguity by measuring changes in MEG recordings during a visual lexical decision task in which the properties of ambiguous words were manipulated. Words that are ambiguous between unrelated meanings (like bark, which can refer to a tree or to a dog) were accessed more slowly than words that have no unrelated meanings (such as cage). In addition, words that have many related senses (e.g., belt, which can be an article of clothing or, closely related in sense, a fan belt used in machinery) were accessed faster than words that have few related senses (e.g., ant). The findings are inconsistent with accounts that posit that both kinds of ambiguity involve separate lexical entries, but instead offer both behavioral and neurophysiological support for separate entry accounts only for homonymy, and a single-entry model of polysemy. The findings also provide neural correlates for a behavioral study of lexical ambiguity that demonstrated that the frequently reported ambiguity advantage in lexical decision tasks is not due to the presence of many unrelated meanings but to the presence of many related senses.

Original languageEnglish (US)
Pages (from-to)57-65
Number of pages9
JournalCognitive Brain Research
Volume24
Issue number1
DOIs
StatePublished - Jun 2005

Keywords

  • Ambiguity
  • Language
  • Lexical access
  • Lexical decision
  • MEG

ASJC Scopus subject areas

  • Experimental and Cognitive Psychology
  • Cognitive Neuroscience
  • Behavioral Neuroscience

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