Humans hold and cuddle and stroke; rats lick. A 1998 study found that rats whose mothers had given them more licking and other kinds of nurturing contact during their infancy had, as adults, more efficient brain circuitry for reducing anxiety. They also had more receptors on their nerve cells for benzodiazepines, which are natural tranquilizing chemicals found in the brain.6 I think here of my many patients who, on top of cocaine and heroin addictions, have been hooked since their adolescence on street-peddled “benzo” drugs like Valium to calm their jangled nervous systems. For a dollar a
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