In his book, "Major Issues in Cognitive Aging," Timothy A. Salthouse, professor of psychology and director of the Cognitive Aging Laboratory at the University of Virginia, writes, "Although there is no shortage of opinions about cognitive aging, it sometimes seems that relatively few of the claims are based on well-established empirical evidence ... assertions about cognitive aging may be influenced as much by the authors' preconceptions and attitudes as by systematic evaluations of empirical research."