Using patient and proxy reports as outcome measures in Alzheimer disease research. Human health and well-being: Dark spots in a room can appear ominous to people with dementia. Yaffe K, Fox P, Newcomer R, Sands L, Lindquist K, Dane K, Covinsky KE. Cool-white light loses its warmth and aliveness and the skin takes on a lifeless pallor. Barbara Plitnick, Dennis Guyon, and Rebekah Mullaney of the Lighting Research Center are acknowledged for their contributions to the manuscript. Task Lighting As with age, dementia only sharpens the need for brighter, more direct light when someone is performing a task.