Speed And Accuracy Of Positioning Weightless Objects As A Function Of Mass Distance And Direction
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Speed and Accuracy of Positioning Weightless Objects as a Function of Mass, Distance, and Direction
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.
Effects of Simulated Weightlessness Upon Positioning Responses
"The speed and accuracy of positioning movements as functions of distance, direction, and mass were investigated under simulated weightless conditions. Subjects seated on a frictionless device made blind positioning movements by sliding each of two frictionless masses (1000 or 7000 grams) various distances (10, 20, and 40 cm) either left-to-right or near-to-far. Both speed and accuracy decrease with distance; left-to-right movements take longer, but are more accurate than near-to-far movements. Speed decreases with increased mass. With minor exceptions, the effects are similar to those noted when fixed subjects position weightless objects. The responses of fixed subjects were slower, but more accurate, and were not affected by the variable of mass."--Abstract.