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Beville, who first studied the relationship of caregivers to aging patients in the 1980s as a postgraduate in clinical psychology, has been selling VDT kits since 2003.

Along with 35 employees and associates of the Sunrise Senior Living Community in McLean, I was taking a class for caregivers that its creator calls VDT -- the Virtual Dementia Tour.

The recordings were mixed to simulate hearing loss and to increase participants' confusion, VDT creator P.K.

VDT participants have the same response.

Next month, Sunrise communities in Northern Virginia will host VDT demonstrations for people caring at home for relatives with dementia.