Alexander Bain built on Hobbes' view, saying that its characteristic degradation could involve ideas as well as people.  
In a 1944 paper, H. J. Eysenck divided theories of it into four categories: cognitive, conative, affective and instinctive. Robert Provine claims that its concomitants result solely from social interaction, while Jaak Panskepp found evidence for it in a subaudible rat noise. Alexander Bain built on Hobbes' view, saying that its characteristic degradation could involve ideas as well as people.  Arthur Koestler, in The Act of Creation, argues that it results from the bisociation of a mental event and emotion, while Mary Rothbart claims that it consists of incongruity in a safe context.  Freud held that it resulted from aggression and that it results from the release of tension in the subconscious. FTP, identify this human capacity, which is sometimes inspired by clowns.
In a 1944 paper, H. J. Eysenck divided theories of it into four categories: cognitive, conative, affective and instinctive.
humor or laughter