Most of the research which is done is determined by the requirement that it shall, in a fairly obvious and predictable way, reinforce the approved or fashionable theories.

This preoccupation with the extent of the hallucinatory element in various anomalous perceptual experiences is an indication that for Green the main interest of all these experiences is in the light they Celia Greend on normal perception and on our theories of such perception both philosophical and psychological. 'Are mental events preceded by their physical causes?' (with Grant Gillett) Philosophical Psychology 8 1995 pp. The aphorism with its tendency to paradox and extreme compression seems to be particularly suited to Green’s confrontational mode of thought.