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Related Experiment Video

Updated: May 11, 2026

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Alternating and sequential motion rates in older adults.

John E Pierce¹, Susan Cotton, Alison Perry

¹Peninsula Health, Frankston, VIC, Australia. pierce.john.e@gmail.com

International Journal of Language & Communication Disorders

|May 9, 2013

Summary

This study provides normative data for articulatory diadochokinesis in older adults. Males showed faster alternating motion rates (AMR) than females, but age did not significantly affect speech rates.

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Area of Science:

Speech-language pathology
Neuroscience
Gerontology

Background:

Articulatory diadochokinesis (ADK) tests like alternating motion rate (AMR) and sequential motion rate (SMR) are crucial for evaluating motor speech disorders.
Existing normative data for ADK in adults aged 65 and older is lacking, hindering accurate clinical assessment.

Purpose of the Study:

To establish a representative normative dataset for AMR and SMR in adults aged 65 years and older.
To investigate the influence of age and gender on these speech motor rates in the elderly population.

Main Methods:

Seventy-six healthy adults (65-86 years) were audio-recorded performing AMR (/pa/, /ta/, /ka/) and SMR (/pataka/) tasks.
Acoustic analysis software measured the rate of the first nine syllables for each task.
Generalized linear models were used to examine age and gender effects, including rate variability.

Main Results:

Normative data for AMR and SMR were successfully obtained for both age groups and genders.
No significant effect of age on speech rates was observed.
Males exhibited significantly higher AMR than females for /pa/, /ta/, and /ka/ tasks, but no gender difference was found for SMR.

Conclusions:

This study provides essential normative values for AMR and SMR in older adults across different genders and age brackets.
Deviations from these established norms in older adults may indicate underlying motor speech issues rather than normal aging.