The Pairwise Variability Index and coexisting rhythms in language.

Area of Science:

• Linguistics
• Phonetics
• Language Typology

Background:

• The Pairwise Variability Index (PVI) is a common metric for quantifying language rhythm.
• It is often used to categorize languages on a stress-timing to syllable-timing continuum.
• Previous applications of PVI may contain anomalies.

Purpose of the Study:

• To review the history and rationale of the PVI.
• To identify and address anomalies in PVI application.
• To propose a new model for understanding language rhythm.

Main Methods:

• Review of existing literature on the PVI and language rhythm.
• Application of the PVI at the 'foot' level of linguistic analysis.
• Comparative analysis of Estonian, English, Mexican Spanish, and Castilian Spanish.

Main Results:

• Identified potential anomalies in the standard application of the PVI.
• Demonstrated that stress-timing and syllable-timing can be viewed as orthogonal dimensions, not a linear continuum.
• Data from Estonian, English, and Spanish provide support for this revised model.

Conclusions:

• The traditional stress-timing/syllable-timing continuum is an oversimplification.
• Languages can exhibit characteristics of both stress-timing and syllable-timing simultaneously.
• A new framework is proposed for analyzing language rhythm based on orthogonal dimensions.