Hearthstone's research division has been studying the effects of the environment on the management and treatment of Alzheimer's Disease for over a decade.
Listed below are some of these works:

ARTICLES AVAILABLE AS PDF DOWNLOADS:

Environmental Correlates to Behavioral Outcomes in Alzheimer's Special Care Units, with Nina M. Silverstein, Joan Hyde, Sue Levkoff, M. Powell Lawton, & William Holmes, The Gerontologist, November, 2003.
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Non-pharmacological Treatment for Alzheimer's disease: a mind-brain approach (with Paul Raia) American Journal of Alzheimer's Disease and Other Dementias Volume 15, No. 6, November -December 2000; abstract published in The Journal of Neuropsychiatry and Clinical Neurosciences, Volume 12, No. 1, Winter 2000.
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Zeisel, John; Welch, Polly; Epp, Gayle & Demos, Stephen Midrise Elevator Housing for Older People, U.S. Department of Housing and Urban Development 1983

Zeisel, John & Welch, Polly Housing Designed for Families: A Summary of Research, Building Diagnostics 1981

Zeisel, John, Joan Hyde, et al Best Practices: An Environment-Behavior Model for Alzheimer Special Care Units, American Journal of Alzheimer Care 1994.

Zeisel, John, Joan Hyde, et al Environmental Design as an Alzheimer Treatment: Preserving Quality of Life in Advanced Dementia, Brunner/Mazel 1999.

Zeisel, John Inquiry by Design: Tools for Environment-Behavior Research Press Syndicate of the University of Cambridge 1981

Zeisel, John Low-Rise Housing for Older People: Behavioral Criteria for Design U.S. Government Printing Office 1977

Zeisel, John Stopping School Property Damage American Association of School Administrators and Educational Facilities Laboratories in collaboration with City of Boston Public Facilities Department 1976

Welch, Polly; Parker, Valerie; and Zeisel, John Independence through Interdependence: Congregate Living for Older People, Reprographics 1984