George Sidney Brett FRSC (5 August 1879 Briton Ferry, Wales – 27 October 1944 Toronto, Ontario, Canada) was a British-Canadian psychologist.
[1] Brett's work occurs in the wake of the divorce between Psychology and Philosophy, a divorce in which Psychology was to undergo several changes in identity beginning with its attempt to be a "Science of consciousness" leading to a revisionist behavioural definition, the "Science of behaviour" which in its turn was tied to the influence of observational-ism and the anti-Metaphysical positivist spirit of the times.
His volumes thus begin with the Pre-Socratics and trace metaphysical investigations insofar as they are connected with issues of Philosophical Psychology up to but not including twentieth-century theories.
R S Peters revived Brett'swork by carrying our a successful abridgment of his three volumes into one.
In this work, Peters added reflections on twentieth-century Theories that attempted to follow the pattern of Brett's earlier volumes.