It's an old cliché: mom springs awake at the first cry of her baby while dad snores through the entire episode. It turns out there may be a biological reason for pop's baby-deafness.
A new study published in the medical journal Neuroreport found a spike in brain activity in women when they hear the cries of babies, reports the Los Angeles Times. The study had men and women subjects listen to white noise and encouraged them to let their minds wander. Then they interspersed the recording with the sounds of baby cries. The scans of the women's brains showed a reaction to the cries; the scans of the men's brains showed that they remained neutral.