http://worldcat.org/entity/work/id/137024300

A Pulse function, single axis, compensatory tracking apparatus

An apparatus which provides a one-dimensional compensatory tracking task for psychological research is described. A photograph, schematics, and description of the circuitry are included. The apparatus was developed to fulfill the requirements of a task designed primarily to compare tracking performance under normal gravity to performance under zero or other abnormal gravity. The task is to attempt to keep the spot on a cathode-ray tube centered using an aircraft- or similar-type control stick. Programmed pulses having either of two amplitudes and durations and separated by either of two intervals casue the spot to suddenly move vertically either of two distances up or down from center when being tracked. These pulse parameters are programmed to seem random. The forcing function pulses driving the spot and the subject's response can both be recorded to yield specific data and, as presently used, afford a comparison of normal tracking performance with performance under zero gravity.

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