This volume contains the proceedings of a symposium held in St. Vincent,
Italy, on August 3-6,1976, entitled "Vigilance II: Relationships Among
Theory, Physiological Correlates, and Opera- tional Performance." The
symposium was sponsored jointly by the Human Factors Panel of the
Scientific Affairs Division of NATO and by the Physiology Programs
Office of the U.S. Office of Naval Research (Contract N00014-76-C-0722).
These sponsorships, and the helpful assistance of Dr. Donald P. Woodward
and Dr. John A. Nagay, are gratefully acknowledged. Following the
editor's introduction, the papers appear in the order they were given at
St. Vincent. In general they are grouped according to the main topical
themes of the symposium: keynote ad- dress, vehicle operation,
monitoring and inspection, physiological correlates, stress effects,
individual differences, and theoretical considerations. I must point
out, however, that individual papers often overlapped several of these
topical areas and thus no defini- tive partitioning of the proceedings
has been attempted. I wish to acknowledge the many contributions of my
colleague, Dr. James O'Hanlon, to both the planning of the symposium and
the preparation of the manuscript, and the invaluable role of my wife,
Shirley Jean, in making the symposium such a pleasant one for all. In
addition, I wish to recognize the countless contributions of Lynda Lee
Chilton and Katherine Peimann whose performance in compos- ing, typing,
and proofing the manuscript is certainly a tribute to human vigilance,
and endurance as well.