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Psychophysiological assessment of human reliability in a simulated complex system
1Technische Universität Dresden, Fakultät für Naturwissenschaften und Mathematik, Institut für Arbeits- und Organisationspsychologie und Sozialpsychologie, Germany.
Biological Psychology
|February 5, 1996
Summary
Increased job demand and decision latitude heighten operator strain in automated systems. Spreading decision authority across teams, rather than concentrating it, may improve human reliability and reduce stress.
Area of Science:
- Human-computer interaction
- Occupational health psychology
- Systems engineering
Background:
- Stress-strain processes significantly impact operator reliability in highly automated systems.
- Job demand and decision latitude are key factors influencing these processes.
- Understanding these dynamics is crucial for optimizing human performance in complex control environments.
Purpose of the Study:
- To investigate the psychophysiological and subjective responses of operators under varying job demands and decision latitude.
- To evaluate the impact of decision authority distribution within teams on operator strain and reliability.
- To test and potentially refine existing models of job design and stress, such as Karasek's model.
Main Methods:
- Objective task analysis of 50 operators controlling an electroenergy network to define typical tasks.
- Simulated workplace study using identical equipment and information transfer relations.
- Ambulatory monitoring of heart rate (HR), blood pressure (BP), and motor activity over 3-hour periods.
- Subjective self-reporting of strain, emotion, motivation, perceived control, and success via pocket computer.
Main Results:
- Marked increases in strain were observed with rising job demand and increased decision latitude.
- Operators with decision authority in dyadic teams exhibited significantly higher HR, BP, and self-reported strain compared to co-operators.
- Findings partially contradicted Karasek's (1979) model regarding the effects of decision latitude.
Conclusions:
- Increasing decision latitude alone may not enhance human reliability and can increase operator strain.
- Distributing decision authority across the entire team is suggested as a strategy to improve human reliability.
- Further psychophysiological research is needed to explore alternative models for designing complex systems to mitigate strain and boredom-induced decrements in reliability.