David Stevens' paper, copied below, was originally published in 1997, in a journal not accessible to everyone. It is still relevant to theories of behavioural bimodality, in particular Michael R A Chance's on the hedonic and agonic modes, and therefore reproduced on this blog. The editor of the ASCAP Newsletter and the author's widow gave permission. It was written for a readership well acquainted with Chance's theory, and thus lacks an explanation of the latter. For a concise rendering of this theory, you may read section IV of the fore-going entry on this blog: On tangentiality in behaviour of animals and humans.
(Koenraad Kortmulder)
