Wavelet denoising of vaginal pulse amplitude.
Vaginal pulse amplitude (VPA) has been the most commonly analyzed signal of the vaginal photoplethysmograph. Frequent, large, and variable-morphology artifacts typically have crowded this signal. These artifacts usually were corrected by hand, which may have introduced large differences in outcomes across laboratories. VPA signals were collected from 22 women who viewed a neutral film and a sexual film. An automated, wavelet-based, denoising algorithm was compared against the uncorrected signal and the signal corrected in the typical manner (by hand). The automated wavelet denoising resulted in the same pattern of results as the hand-corrected signal. The wavelet procedure automated artifact reduction in the VPA, and this mathematical instantiation permits the comparison of competing methods to improve signal:noise in the future.
Prause
Nicole
N
Department of Psychology, Idaho State University, Pocatello, Idaho, USA. nprause@isu.edu
Williams
Kameryn
K
Bosworth
Ken
K
D000328:Adult; D000465:Algorithms; D016477:Artifacts; D003627:Data Interpretation, Statistical; D005006:Ethnicity; D005260:Female; D006801:Humans; D010775:Photic Stimulation; D017156:Photoplethysmography / Q000379:methods* / Q000706:statistics & numerical data*; D012069:Religion and Psychology; D012725:Sexual Behavior; D014621:Vagina / Q000502:physiology*; D055815:Young Adult