Fig. 4From: Sex differences in thermal detection and thermal pain threshold and the thermal grill illusion: a psychophysical study in young volunteersGaussian mixture model of cold pain thresholds. The graphs display the data after rescaling for stimulus intensity and subsequent log transformation. The density distributions are presented as probability density function (PDF), estimated using a Gaussian mixture model (R-program AdaptGauss [30]). The optimum number of mixes was found to be M = 6. Black curve: PDF; red curve: Gaussian mixed model, Gaussians: grey = 1, yellow = 2, green = 3, cyan = 4, orange = 5, blue = 6; purple: Bayes boundaries of the Gaussians. ALL: N = 296 subjects, FEMALE: N = 208, MALE: N = 88Back to article page