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of the vaginal pulse wave. It is calculated by subtracting the means of all troughs from the means of all peaks experienced during stimulus presentation. VPA lacks an absolute scale of measurement; each unit of change (mV) does not correspond directly with a physiological change. Since VPA does not
85:, which senses reflected light. The use of the device is done with the assumption that the more light that is scattered back, and that the photocell senses, the more blood is in the walls of the vagina.
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of the vaginal wall associated with each heartbeat. While changes in VBV occur in response to sexual and anxiety-inducing stimuli, changes in VPA only occur in response to sexual stimuli.
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and recorded vaginal pulse waves. Sintchak and Geer improved on the device in the 1970s by using a vaginal probe which became the common instrument to measure vaginal blood flow.
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Jannsen, Erick; Prause, Nicole; Geer, James H. (2007). "Chapter 11: The Sexual
Response". In Cacioppo, John T.; Tassinary, Louis G.; Berntson, Gary (eds.).
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69:. There is an overall poor correlation (r = 0.26) between women's self-reported levels of desire and their VPG readings.
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VPG was first introduced in the 1960s by Palti and
Bercovici, who affixed a light source and photosensitive cell onto a
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have a standard unit of measurement, it is difficult for researchers to make between-participant comparisons.
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The output of the VPG can be filtered into two types of signals, which have different properties. The
170:"Agreement of Self-Reported and Genital Measures of Sexual Arousal in Men and Women: A Meta-Analysis"
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Palti, Y. & Bercovici, B. , “American
Journal of Obstetrics & Gynecology, 97, 143–53”, 1967
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signal is a measure of vaginal pulse amplitude (VPA) and reflects the pressure change within the
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signal is a measure of vaginal blood volume (VBV) and reflects the total blood volume in the
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Technique using light to measure the amount of blood in the walls of the vagina
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Sintchak, G; Geer, JH (January 1975). "A vaginal plethysmograph system".
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The device is used to try to obtain an objective measure of a woman's
279:"SexLab - Equipment & Instruments - Vaginal Photoplethysmography"
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Hatch, J. P. ,”Archives of Sexual
Behavior, 8, 357–374”, 1979
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Chivers ML, Seto MC, Lalumière ML, Laan E, Grimbos T (2010).
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The instrument used in the procedure is called vaginal
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351:Female genital procedures
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107:VPA is defined as the
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79:photometer
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