Endocrine Effects of Grooming
Grooming stimulates the release of beta-endorphin, which is one physiological reason for why grooming appears to be relaxing.
Additionally, an article published in 1997 concluded that an increase in maternal grooming resulted in a proportionate increase in Glucocorticoid receptors on target tissue in the neonatal rat. Additionally, it was found that the receptor number was altered because of a change in both serotonin and thyroid-stimulating hormone concentrations. An increase in the number of receptors might influence the amount of negative feedback on corticosteroid secretion and prevent the undesirable side effects of an abnormal physiologic stress response.
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“Upon the whole, necessity is something, that exists in the mind, not in objects; nor is it possible for us ever to form the most distant idea of it, consider’d as a quality in bodies. Either we have no idea of necessity, or necessity is nothing but that determination of thought to pass from cause to effects and effects to causes, according to their experienc’d union.”
—David Hume (1711–1776)
“Cats are the ultimate narcissists. You can tell this because of all the time they spend on personal grooming. Dogs aren’t like this. A dog’s idea of personal grooming is to roll in a dead fish. Dogs spend their time thinking about doing good deeds for their masters, or sleeping.”
—James Gorman (b. 1949)