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Updated: May 19, 2025
On the whole, therefore, we find the Surplus-Energy Theory of play quite inadequate. II. Another theory therefore becomes necessary if we are to meet these difficulties. Such a theory has recently been developed.
All this goes to support another and most serious objection to this theory in the mind of all those who believe in the doctrine of evolution. The Surplus-Energy Theory considers the play-impulse, which is one of the most widespread characters of animal life, as merely an accidental thing or by-product a mere using-up of surplus energies. It is not in any way important to the animals.
I. The older theory considered play simply the discharge of surplus nerve force in the animal's organism. He was supposed to play when he felt fresh and vigorous. The horse is "skittish" and playful in the morning, not so much so at night. The dogs lie down and rest when they are tired, having used up their surplus energies. This is called the Surplus-Energy Theory of play.
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