The old lady can still see in her mind 's eye every piece of furniture in the house where she lived as a child.

老太太仍然能清楚地记得她小时候住的房子里的每一件家具。

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But enquiring about a child's use of eye contact, sounds, words and gestures can flag up early on if more detailed screening is needed, a study shows.

BBC: Screen may spot autism in one-year-olds

So while it's likely best for parents, regardless of their child's race or gender, to keep a mindful eye on TV consumption, Harrison and Martins' research suggests it's especially important for parents of girls and African-American boys.

CNN: TV can boost self-esteem of white boys, study says