from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. An optically obtained plethysmograph, often produced by illuminating the skin in order to measures changes in light absorption.
What really matters to women, Dr. Chivers said, at least in the somewhat artificial setting of watching movies while intimately hooked up to a device called a photoplethysmograph, is not the gender of the actor, but the degree of sensuality.
Their reactions are tracked using a tampon-shaped "photoplethysmograph," which measures vaginal blood flow in women, and a comparable "rigiscan" in men.
She regularly wires the genitals of her patients to a photoplethysmograph to measure whether the women respond with surges of vaginal blood flow while they watch a pornographic video.
Two types of sensors were used: an electrocardiogram, which measures electrical pulses, and a photoplethysmograph (PPG), which works out a heart rate from variation in light absorption under the skin.