Word Forms Reflect Trade-Offs Between Speaker Effort and Robust Listener Recognition

Area of Science:

• Linguistics
• Cognitive Science
• Computational Linguistics

Background:

• George Kingsley Zipf's "law of abbreviation" suggests speakers simplify word forms to reduce effort.
• This simplification is balanced by the listener's need for distinct word forms for accurate recognition.
• Previous research used word length; this study uses phonotactic probability to measure production effort.

Purpose of the Study:

• To reframe Zipf's law within a broader cognitive framework.
• To investigate the interplay between production effort and perceptual difficulty in shaping lexicons.
• To explain the persistence of long, phonotactically improbable word forms.

Main Methods:

• Replication and extension of recent work on phonotactic probability.
• Using phonotactic probability as a measure of production effort.
• Correlating phonotactic probability with word frequency and perceptual difficulty.

Main Results:

• Phonotactic probability correlates more strongly with word frequency than word length across languages.
• Ease of speech production (phonotactic probability) is strongly correlated with perceptual difficulty.
• Findings support a trade-off between production ease and perceptual distinctiveness.

Conclusions:

• Cognitive pressures create a trade-off between speaker production ease and listener recognition accuracy.
• Phonotactic probability is a robust measure of production effort and is linked to perceptual difficulty.
• This framework explains why diverse word forms exist in natural language lexicons.