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Eric J. Koehler

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Publications by Eric J. Koehler (bibliography)

1995

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Duchon, James C., Smith, Thomas J., Keran, Christopher M. and Koehler, Eric J. (1995): Psychophysiological Effects of Extended Workshifts. In: Proceedings of the Human Factors and Ergonomics Society 39th Annual Meeting 1995. pp. 794-798.

“Working extended workshifts has been linked to decrements in behavioral performance and physiological function, plus subjective complaints. This report describes findings before and after workers in an underground mine converted from a continuous 8-hour to a 12-hour rotating shift schedule. A psychophysiological approach to work schedule evaluation was employed, involving continuous heart rate (HR) recording accompanied by pre-, mid-, and post-shift measures of cognitive and psychomotor behavioral performance, HR recovery and estimated VO{sub:2max} levels using submaximal exercise testing, and subjective mood and sleepiness responses. The continuous HR results suggest adaptation of work effort or output on 12-h relative to 8-h shifts. Some measures of performance, namely self-report mood and sleepiness responses plus HR recovery, suggest more fatigue on 12-h shifts. We conclude that working extended workshifts may result in an adaptive response to fatigue, manifest in the form of pacing or modulated work effort by the workforce.”

1994

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Keran, Christopher M., Smith, Thomas J., Koehler, Eric J. and Mathison, Peter K. (1994): Behavioral Control Characteristics of Performance under Feedback Delay. In: Proceedings of the Human Factors and Ergonomics Society 38th Annual Meeting 1994. pp. 1140-1144.

“As part of a larger research project dealing with technological change, the U.S. Bureau of Mines has initiated a study of the nature and sources of variability in human performance during teleoperation. One important source of performance degradation during remote work is delay in sensory feedback from the remote site to the operator during task execution, caused by such factors as transmission and signal processing lags or inertia/momentum properties of large equipment. To investigate the properties of the behavioral control system under delayed feedback conditions, the Bureau has implemented a pursuit tracking task during which delay is imposed as a continuously varying sinusoidal forcing function. Using 11 subjects, the dynamic characteristics of tracking performance were assessed across a range of variable delay frequencies. Specifically, sinusoidal variations in visual feedback delay between 0 and 400 msec were imposed during a tracking task at frequencies between .05 and 2 Hz. The results show that RMS error, gain (fundamental FFT peak for the cursor signal/fundamental FFT peak for the target signal), and phase (phase angle difference between the target signal and the cursor signal) of the tracking control system are independent of variable feedback delay imposed across a forty-fold range of frequencies. One important implication of these findings is that operators may have limited ability to adapt to feedback delay conditions that may be present during teleoperation of large mobile mining equipment.”

1993

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Mathison, Peter K., Koehler, Eric J. and Smith, Thomas J. (1993): Behavioral Effects of Delayed and Displaced Visual Feedback Using Computer-Mediated Perturbation Forcing Functions. In: Proceedings of the Fifth International Conference on Human-Computer Interaction - Poster Sessions: Abridged Proceedings 1993. p. 134.

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