Researchers projected light through the uterine wall of pregnant mothers, and discovered that fetuses at 34 weeks gestation will turn their heads to look at face-like images over other shapes.
The researchers tested the responses of 39 fetuses to face-like patterns of light presented to them in both upright and inverted pattern.
The projected light moved across their field of vision while researchers watched the fetuses’ reactions using 4D ultrasound.
The result showed that the developing babies turned their heads to look more often at face-like stimuli that were upright than those that were presented to them upside down.
The findings also confirm that fetuses have enough light to see and have visual experiences in the womb.