The thinker who has a mortal fear of being wrong will give all that is valuable in himself to that little ambition. Walter Lippmann (1914) Psychology has always been plagued by passing fads and fan cies to a greater extent than is seemly in a scientific discipline. Over the past few years the Zeitgeist can be summed up by the two words 'cognitive psychology'. Indeed, a recent poll of academic psychologists in American indicated that over 80% of them regarded themselves as cognitive psychologists Cognitive psychology is in the ascendant, but it has never been clear to me that it has addressed...