Multiple Identity Tracking and Entropy in an ATC-like Task

This research investigated an observer's ability to track and maintain multiple uniquely identified objects in a dynamic environment similar to ATC. The experimental task consisted of tracking a set of moving objects for twenty seconds. The objects were 6-character strings; three letters followed by three numbers. After tracking the objects for twenty seconds, the participants were instructed to locate a target-object. The time required to find the target object was recorded. The number of objects and the magnitude of direction changes (entropy) were manipulated. We found (1) a highly significant effect of increasing response times as a function of number of objects, (2) a marginally significant effect of entropy, decreasing response times as a function of entropy, and (3) a significant effect of displacement, increasing response times as a function of objects' displacement.

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