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Kevin Simonton

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Publications by Kevin Simonton (bibliography)

1991

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Simonton, Kevin, Vercruyssen, Max and Hashizume, Kazuo (1991): Effects of Posture on Reaction Time: Influence of Gender and Practice. In: Proceedings of the Human Factors Society 35th Annual Meeting 1991. pp. 768-771.

“This study was the eighth in a series of reaction time studies conducted to determine the effects of posture on human information processing. The purpose in the present experiment was to examine the effects of sex/gender and practice on posture differences in reaction time. Twenty-four college-age subjects (12 male, 12 female) participated during six separate sessions in which reaction time (RT) tasks were performed while sitting and standing. Each session consisted of 20 practice trials on each task, followed by 50 trials of a visual serial four-choice reaction time task (SCRT) and a visual discrete four choice reaction time task (CRT), counter-balanced according to gender, posture, and type of task. Blood pressure and heart rate were also measured throughout each session. Results show the overall mean RT to be significantly faster standing than sitting. There were no significant gender differences in terms of overall mean RT. Reaction time became significantly faster with practice with the largest difference between adjacent sessions (sessions 1&2) equal to 25 ms. Posture benefits are so small and reveal themselves only in certain conditions, such as testing unpracticed subjects, on certain tasks, but these findings may have implications for workstation design or personnel selection. Based on the worker's skill, certain employees may benefit more from a semi-standing posture when performing certain tasks.”

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