Nobuo Masataka of Japan's Kyoto University tested 60 healthy women of child-bearing age at
three different phases of their cycle.
three different phases of their cycle.
They were simultaneously shown nine pictures, one of which was a snake among flowers while the others were only of flowers.
The volunteers were tested on how quickly they spotted the serpent.
The fastest women were those who were in the so-called luteal phase of their menstrual cycle, or the stage that immediately follows ovulation.
The study strengthens theories that we have a "fear reflex," or an innate response to threat signals such as potentially poisonous snakes, Masataka believes.
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