A 48-hour field experiment was conducted to determine the effects of sustained activity on the performance of tank crews in communication, driving, surveillance, gunnery, and maintenance activities. Moving surveillance and some driving activities showed statistically significant performance deterioration over a 48-hour period of work without sleep. The experiment showed that the diurnal rhythm of the subjects did not affect performance significantly. The results of the experiment support a broad conclusion that tank crews using present equipment can maintain operational proficiency during 48 hours of sustained activity.
J ÜRGEN AscHOFF "Very bad habit! Very bad habit!" Captain Giles to Joseph Conrad who had taken a siesta. -Conrad: The Shadow Line On the Multiplicity of Rest-Activity Cycles: Some Historical and Conceptual Notes According to its title this book tries to answer the profound question of why we nap-and why Captain Giles was wrong in blaming Conrad for having napped. However, in this volume the term nap is not used in the narrower sense of an afternoon siesta; instead, emphasis is placed on the recurrent alternation between states of alertness and drowsiness, i. e. , on rest-activity cycles of high er frequency throughout the 24 hr. In view of this focus, two authors (Stampi, in Chapter I, and Ball, in Chapter 3) rightly refer to the psychologist Szymanski who was among the first to describe "polyphasic" activity patterns. Hence, I consider it appropriate to open this foreword with a few historical remarks. At the time when Szymanski (1920) made the distinction between "monophasic" and "polyphasic" rest-activity patterns and sleep-wake cy cles, respectively, not much was known about the mechanisms of such temporal structures. Although the botanists quite some time ago had demonstrated the endogenous nature of the "monophasic" sleep movements in plants, the hypothesis of an (still unknown) external driving force was favored by those who studied rhythms in animals and humans (Aschoff, 1990).
The world is a dangerous place and recent events have served to make it less safe. There are many arenas of conflict and even combat across the world. Such situations are the quintessential expression of stress; you stand in imminent danger and live with the knowledge that you may be attacked, injured or even killed at any moment. How do people perform under these conditions? How do they keep a heightened level of vigilance when nothing may happen in their immediate location for weeks or even months? What happens when the bullets actually start flying? How is it you distinguish friend from foe, and each from innocent bystanders when in immediate peril of your life? Can we design technology to help people make good decisions in these ultimately hazardous situations? To what degree does your membership in a team act to dissipate these particular effects? Can we generate sufficiently stressful field exercises to simulate these conditions and can we train and/or select those most able to withstand such adverse conditions? How will the next generation of servicemen deal with these inherent problems? These are the sorts of questions that Performance Under Stress addresses. This book is derived largely from a multiple-year, multiple university initiative (MURI) on stress and soldier performance on the modern, electronic battlefield. It involved leading researchers from many institutions who have brought their individual expertise to bear on these crucial, contemporary concerns. United by a common research framework, these groups attacked the issue from different methodological and conceptual approaches, ranging from traditional laboratory modeling and experimentation, to realistic simulations; from involved field exercises to personal experiences of actual combat conditions. The insights generated have been distilled and presented as a benchmark of current understanding and provide future directions for research in this arena. Although this work focuses on soldier stress and soldier performance, the principles that are derived extend well beyond this single application. Their findings can be applied to people facing the demands of the business world or research as much as to those who meet life or death situations, such as homeland security, first responders, and law enforcement personnel.
First published in 1982. This is Volume III of a three-volume series and focuses on stress and performance effectiveness. This series of volumes reviews the state of the art in several areas of human performance research. These areas are human capability assessment, information processing and decision making, and job stress. It was recognized that these have been active research areas, but work in these areas has not previously been linked directly to national concerns about productivity. The focus is on implications for improving productivity and for recommending research in these areas that should have impact on productivity.
Workload transition is a potentially crucial problem in work situations wherein operators are faced with abrupt changes in task demands. People involved include military combat personnel, air-traffic controllers, medical personnel in emergency rooms, and long-distance drivers. They must be able to respond efficiently to sudden increases in workload imposed by a failure, crisis, or other, often unexpected, event. This book provides a systematic evaluation of workload transition. It focuses on a broad spectrum of activities ranging from team cooperation to the maintenance of this problem on a theoretical level and offers several practical solutions.
The pace of life in our high technology world has quickened. Industries that do not become more efficient, often by requiring a faster production turnaround with less slack, are superseded. Because of this, workers face an environment in which they must perform under more time pressure and under greater task load, in which stress is more prevalent, and in which consequences of poor performance are more critical than ever before. The dominant, if unstated, psychoanalytic paradigm underlying much stress research over the past fifty years has led to an emphasis on coping and defense mechanisms and to a preoccupation with disordered behavior and illness. Accordingly, almost any book with "stress" in the title will invariably devote a considerable amount of pages to topics such as stress-related disorders, clinical interventions, stress and coping, psychopathology, illness, and health issues. This book presents basic and applied research that addresses the effects of acute stress on performance. There are a large number of applied settings that share the commonalities of high demand, high risk performance conditions, including aviation; military operations; nuclear, chemical, and other industrial settings; emergency medicine; mining; firefighting; and police work, as well as everyday settings in which individuals face stressors such as noise, time pressure, and high task load. This book focuses directly on the effects of acute stress-- defined as intense, novel stress of limited duration--on performance. The effects of stress on task performance, decision making, and team interaction are discussed, as well as the interventions used to overcome them.
This volume focuses on the temporal adaptations of teams. An increase in the use of teams has led to more team research throughout the fields of cognitive science, human factors, organizational psychology, and behavioral science. This book serves as a resource to researchers who study teams, managers who lead teams, and those who work in teams.
