Summary

McGill researchers have discovered that serotonin, a brain chemical best known for its role in mood and mental health, also helps regulate attention. "Our findings suggest serotonin-producing neurons deep in the midbrain act like a dimmer switch on attention," said Arjun Krishnaswamy, associate professor in the Department of Physiology, who co-led the study with associate professor Erik Cook. The findings were published in Nature Communications . More than a century of research has revealed how attention shapes behavior, but the biology that controls attention remains poorly understood.

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