Aaron Smith died on June 13, 1998. He was a past
president and founding member of the International Neuropsychological
Society, Charter Member and Diplomate of the American Board
of Clinical Neuropsychology, Editor of the International
Journal of Neuroscience and Professor Emeritus of
the University of Michigan. He also developed the Symbol
Digit Modalities Test and the Michigan Neuropsychological
Battery. In both cases he employed a rationale which permitted
differentiation of impairments in higher cognitive functions
that the tests were designed to measure from deficits in
lower sensory input and motor output modalities which were
required to carry out the tests.