Evidence from acoustic, phylogenetic, and neurobiological studies supports the claim that laughter has deep evolutionary, genetic, and physiological foundations in humans and related primates.
The retrieved literature consistently confirms that laughter possesses stereotyped acoustic features (Paper 0), shares a common phylogenetic and evolutionary origin with great apes (Paper 3), and is linked to specific neurobiological and physiological pathways such as orexin neurons and brainstem circuits (Paper 5). There are no papers contradicting the claim.