Click to increase image sizeClick to decrease image size Additional informationNotes on contributorsM Powell LawtonM Powell Lawton is the Director of Behavioral Research for the Philadelphia Geriatric Center. As a pioneer in environmental psychology and environmental research and aging, Dr Lawton has accrued extensive credits in research, publication and consultation while maintaining a role as a counselling clinical psychologist. A Fellow of the Gerontological Society and the American Psychiatric Association, he has served in numerous elected and appointed roles.
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M. P. Lawton (1977) studied this question.