The presentation times (milliseconds on a computer screen followed by
a masking grid) required for the correct identification of tachistosco
pically presented perinatal stimuli were compared for 30 pregnant wome
n and 25 perimenopausal women. Analysis indicated a differential facil
itation or inhibition of perception in logical relation to subjects' c
loseness to pregnancy or menopause: pregnant women are quicker to iden
tify stimuli related to pregnancy or babies but slower to recognize pi
ctures of a pregnant woman with her father or mother. This supports th
e validity of measurements based on the theory of perceptual defense o
r vigilance.