Linearity of the electromechanical penile plethysmograph's output at large expansions

Despite the widespread use of the Barlow-type electromechanical plethysmograph for monitoring changes in penile circumference, doubts have arisen about its sensitivity at large expansions. This study investigated the linearity of both a used and unused gauge over a wide range of standardized expansi...

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Bibliographic Details
Published in:The Journal of sex research 1990-05, Vol.27 (2), p.283-287
Main Authors: Richards, Jeffrey C., Kalucy, Ross S., Wood, Michael M., Marshall, Villis R.
Format: Article
Language:English
Subjects:
Anatomy & physiology
Brief Reports
Calibration
Circumferences
Correlation coefficients
Election laws
instrumentation
male sexual response
Measuring instruments
Men
penile plethysmography
Psychophysiology
Sexual behavior
Strain gauges
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Summary:Despite the widespread use of the Barlow-type electromechanical plethysmograph for monitoring changes in penile circumference, doubts have arisen about its sensitivity at large expansions. This study investigated the linearity of both a used and unused gauge over a wide range of standardized expansions. For both gauges, the relationship between electrical output and physical expansion was almost linear. A logarithmic 10 transformation on the physical expansion data did not for either gauge achieve perfect linearity. Contrary to suggestions in the literature, therefore, such a transformation is not required when using this gauge.
ISSN:0022-4499
1559-8519
DOI:10.1080/00224499009551557