The problem of other minds is a collection of problems centering upon the extent to which our belief in other minds or other's minds can be justified. Swedish psychologist, Gunnar Borg has developed a principle called "the range principle" which helps fill out our "knowledge" of other minds. Borg developed this principle partly in response to the skeptical challenge of Harvard psychophysicist S S Stevens. Stevens claimed that the intersubjective comparison of experience was scientifically impossible. Borg postulates that the range (...) of individual experience is roughly identical for all individuals. We can test Borg's principle or theory is we include the similarity of physical range for individuals. We have an interesting case of experimental work casting light on a traditional philosophical problem. (shrink)