Study Explains How Screen Time Causes 'Inattentional Deafness'

ABC News' Lara Spencer reports the latest stories in the "GMA" Speed Feed.
0:55 | 12/09/15

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Transcript for Study Explains How Screen Time Causes 'Inattentional Deafness'
So we talked about screen deafness when you literally cannot hear when you're looking at it. Does that happen to you guys. Yes. There is a medical reason for this. We want you to look at a brain scan doing a computer puzzle. They're not hearing a sound despite having tones pumped in their ears. The red wave you see there shows how high it registers sound when not engaged and then this green line shows what we hear when -- how it drops considerably when we're concentrating on something more complicated. The reason is, guy, that a person's sense of vision and hearing are located in a shared and limited region of the brain called the association cortex. Your brain has to choose, it can't multitask. Doing both things or getting stimulated both ways it has to pick which one is more valuable. Can women do it better than men, though. I think they can. Of course, they can.

This transcript has been automatically generated and may not be 100% accurate.

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