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Updated: Aug 13, 2026
A Methodological Approach to Non-invasive Assessments of Vascular Function and Morphology
Published on: February 7, 2015
The labial photoplethysmograph: a new instrument for assessing genital hemodynamic changes in women
Nicole Prause1, Jerome Cerny, Erick Janssen
1The Kinsey Institute for Research in Sex, Gender, and Reproduction, Indianna University, Bloomington, USA. nprause@indiana.edu
Aim:
The labial photoplethysmograph (LP), a new measure for assessing genital responses in women, was compared to the vaginal photoplethysmograph (VP).
Methods:
Fifteen women wore both devices simultaneously while viewing neutral, sexual, sexually-threatening, and threatening film clips.
Results:
The LP and VP exhibited comparable specificity to sexual stimuli. Additionally, the LP demonstrated greater resistance to movement artifacts and a slightly higher correspondence with subjective measures of sexual arousal.
Conclusion:
The LP, while somewhat more difficult to place and less comfortable than the VP, is a promising new measure of genital response in women that warrants further development.
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