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The Hardy Effect

Contact author: Thomas J. Hixon, Department of Speech, Language, and Hearing Sciences, Institute for Neurogenic Communication Disorders, University of Arizona, Tucson, AZ 85721. Email: hixon{at}u.arizona.edu

PURPOSE: The late James C. Hardy completed an extensive investigation of respiratory muscle activity during speech production. The data set that resulted was probably the most comprehensive and instructive that has ever existed. One aspect of the data puzzled Hardy and caused him to question the validity of his findings and withhold his observations from publication.

METHOD: This research note chronicles Hardy's thinking at the time (based on personal communications) and points out how the aspect of the data that puzzled him turned out to be a seminal discovery of a fundamental mechanism of speech breathing.

CONCLUSION: It is proposed that, in his honor, this discovery be referred to as the Hardy Effect.

KEY WORDS: speech production, respiratory muscles, chest wall mechanics

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				R. D. Andreatta Editor's Column: In Memoriam: Dr. Thomas J. Hixon (1940 - 2009) Speech Science and Orofacial Disorders, October 1, 2009; 19(2): 88 - 91. [Full Text] [PDF]