controversy exists over the implications of the experiment. psychologist jonathan freedman's experiment recruited high school and university students to carry out a series of experiments that measured the effects of density on behavior. he measured their stress, discomfort, aggression, competitiveness, and general unpleasantness. he declared to have found no appreciable negative effects in 1975. researchers argued that "calhoun's work was not simply about density in a physical sense, as number of individuals-per-square-unit-area, but was about degrees of social interaction."