The brain's ability to create and maintain bonds is…

The brain's ability to create and maintain bonds is magnificent Certain hormones are released during specific activities like sex, or giving birth, or nursing. Because those hormones flood the brain, and receptors are there, neurons in particular brain regions make stronger neural connections and perform their specialized mental function better following these experiences. This is called permissiveness, because the hormones released during the event give the neurons "permission" to create thicker or more sprouted neurons, or to build more receptors.

— from The Mind in the Cockpit

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