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The goal of the Contrails project is to help preserve and disseminate the technical record of 20th century aerospace research, highlighting in particular the research endeavors of the Illinois Tech community.

Apparatus For Presentation And Continuous Measurement Of Error In A Two-dimensional Compensatory Tracking Task

Report Number: WADC TR 54-335
Author: McGuire, James C.
Corporate Author: Washington University, Dept. Of Psychology, Biomechanics Laboratory
Laboratory: Aero Medical Laboratory
Date of Publication: 1954-12
Pages: 29
PB Number: PB111672
AD Number: AD0057389

Abstract:
An electronic compensatory-tracking apparatus which utilizes a two-dimensional target is described together with its computing and recording circuits. The apparatus was designed to provide a standard task of variable difficulty for use in the study of attention. The target path used approximates the equation Q = cos 2(theta). This is a four-leafed rose curve. The stimulus spot is displayed on the face of a cathode ray oscilloscope (CRO). Control is exercised by the subject through manipulation of a joy stick of very low mass and friction. Subject error, represented by the displacement of the stimulus spot from the intersection of a pair of crosshairs on the CRO screen corresponds to (x^2+y^2)^0.5 where x and y are the input voltages to the CRO. The quantity (x^2+y^2)^0.5 is computed continually by the electronic analog computer and recorded as both a function of time and as an integrated error score.


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