The natural progression of a behavioral scientist is from confidence in “measurement under controlled conditions of observation” to a growing skepticism in the usefulness of the results. Add to this the change from studies of rat subjects to a closing chapter on “What is Human Nature?” and you describe the progression of Jay N. Eacker in his professional writings. His doctoral dissertation prepared for Washington State University in 1966 was The Relation of Visual Complexity, Maintenance Illumination, and Test Illumination to (...) Behaviorally Produced Illumination Changes. The subjects: 144 male albino rats 90 days old. (shrink)