A further note on psychophysical testing of handles.
The psychophysical method of constants was applied to two-handed lifting. A sequence effect was found, with subject's response biased toward which stimulus was presented most recently. This sequence effect drastically reduced the sensitivity of the method for two-handed lifting, so that a further study of comparing sequential and simultaneous lifting was conducted. The results indicated that simultaneous lifting was significantly more sensitive to changes in handle design.
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Department of Industrial Engineering, State University of New York at Buffalo, Buffalo, NY 14260, USA.
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