What makes words sound similar?

Area of Science:

• Cognitive Psychology
• Psycholinguistics
• Computational Linguistics

Background:

• Phonological similarity is crucial for language processing, yet empirical studies are scarce.
• The cognitive mechanisms underlying phonological similarity comparisons remain unclear.
• Existing theories of similarity often lack direct empirical validation in phonology.

Purpose of the Study:

• To empirically investigate the phonological similarity between words.
• To determine if word sound similarity relies on processes similar to other cognitive comparisons.
• To test and refine metrics for quantifying phonological word similarity.

Main Methods:

• Five experiments were conducted using monosyllabic pseudo-words.
• Participants performed similarity judgments between a target pseudo-word and two alternatives.
• Data were analyzed to assess patterns of phonological similarity perception.

Main Results:

• Participant choices generally aligned with predictions from structural alignment theory.
• Phonological word similarity appears to involve processes analogous to those in other domains (visual, semantic).
• New metrics for word similarity were developed and validated by the experimental data.

Conclusions:

• Phonological similarity comparisons share cognitive mechanisms with other representational comparisons.
• Structural alignment theory provides a robust framework for understanding phonological similarity.
• The study opens avenues for future research on word sounds and broader cognitive similarity.