Who's happy? How long we look at happy faces is in our genes

Though we all depend on reading people's faces, each of us sees others' faces a bit differently. Some of us may gaze deeply into another's eyes, while others seem more reserved. At one end of this spectrum people with autism spectrum conditions (ASC) look less at other people's faces, and have trouble understanding others people's feelings. New research published in BioMed Central's open-access journal Molecular Autism has found variations of the cannabinoid receptor (CNR1) gene that alter the amount of time people spend looking at happy faces.

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