Terminating and exhaustive search in lexical access.

Area of Science:

• Psycholinguistics
• Cognitive Psychology
• Computational Linguistics

Background:

• Lexical access, the process of retrieving stored word information, is fundamental to language comprehension.
• Previous models often assume a search process for word recognition, but its exact nature, especially for ambiguous words, remains debated.
• Homographs, words spelled identically but with different meanings, present a unique challenge for lexical access models.

Purpose of the Study:

• To investigate the search process during lexical access, particularly for homographs.
• To determine if lexical access involves an exhaustive search, especially when encountering non-existent entries.
• To explore how word frequency influences decision time in lexical access under different search conditions.

Main Methods:

• Two experiments were conducted involving word classification tasks.
• Experiment 1: Participants classified test items as ambiguous or unambiguous.
• Experiment 2: Participants classified test items based on their syntactic properties.

Main Results:

• Both experiments demonstrated that searching for non-existent word entries involved an exhaustive search process.
• Under these non-existent entry conditions, word frequency did not correlate with decision time, deviating from typical lexical decision tasks.
• The findings suggest that the search model effectively explains accessing the dominant meaning of homographs.

Conclusions:

• The study provides evidence for an exhaustive search mechanism in lexical access when dealing with non-existent entries.
• A distinction is proposed for how common versus less common meanings of homographs are accessed.
• The findings challenge a single, uniform search model for all aspects of homograph processing.