Speed and accuracy of positioning weightless objects as a function of mass, distance and direction
Report Number: WADD TR 61-182 Author: Kama, W. N. Corporate Author: Aerospace Medical Research Laboratory Laboratory: Wright Air Development Division Date of Publication: 1961-03 Pages: 26 AD Number: AD0260131Contrails does not possess a copy of this report. Click here to offer Contrails a donation of this report
Abstract: Human performance in positioning weightless objects was investigated experimentally using an air-bearing frictionless table. The subjects moved each four masses (1000, 3000, 5000, and 7000 gra ) various distances (10,20, and 40 cm) in each of two directions over this frictionless table in response to paired light stimuli. The responses were accomplished in complete darkness after the lights were extinguished. Results were analyzed in terms of constant and absolute errors of positioning, and response time. From the investigation, we concluded that: (1) Mass has little effect on the accuracy of positioning. There i some evidence, however, that response time increases with increase in mass. (2) Distance is a significant variable affecting the direction of error, accuracy, and speed of positioning responses. Response time increases, and accuracy decreases with distance. (3) Direction of movement is a significant variable affecting constant error, absol to error, and speed of positioning responses. Subjects tend to undershoot the mark in near to far movements.