Perception of masculinized or feminized men's faces and its relation to the menstrual cycle phase of women: Electrophysiological evidence.

BRAIN physiology; REPEATED measures design; SEX hormones; T-test (Statistics); DATA analysis; MASCULINITY; FEMININITY; LUTEAL phase; ELECTROENCEPHALOGRAPHY; UNIVERSITIES & colleges; OCCIPITAL lobe; CHI-squared test; DESCRIPTIVE statistics; EXPERIMENTAL design; TEMPORAL lobe; MENSTRUAL cycle; STATISTICS; FRONTAL lobe; DIGITAL image processing; DATA analysis software; CONFIDENCE intervals; PARIETAL lobe; VISUAL perception; FACE perception; ELECTROPHYSIOLOGY

Facial perception involves several brain areas: occipital to process visual stimuli, temporal to regulate emotions, and frontal and parietal to activate attention. Emotional processing relates to theta and delta bands in the temporal and frontal areas. We used a longitudinal design with twelve women to investigate whether the absolute power (AP) of areas involved in face perception changed in response to masculinized and feminized men's faces during the LFP and LP. Results show that the perception of masculinized faces, when compared with feminized faces, modified the AP of delta in the occipital area; the AP of delta, theta, and alpha in the temporal area; and the AP of delta, alpha, and beta in the frontal and parietal areas during the LFP, but not the LP. Furthermore, AP was greater for masculinized faces during the LFP than during the LP. These findings provide new insights into the cortical activity underlying facial masculinity perception during the LFP and LP. [ABSTRACT FROM AUTHOR]

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