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The relationship of human target acquisition times and detection probabilities to electronically measured visual clutter was investigated. Ninety computer-generated scenes simulating infrared imagery and containing different levels of clutter and zero, one, two, or three targets were produced. Targets were embedded in these scenes counterbalancing for range and position. Global and local clutter were measured using both statistical variance and probability of edge metrics. Thirty-three aviators, tankers, and infantry soldiers were shown still-video images of the 90 scenes and were instructed to search for targets. Analyses indicate differences between the aviators and tankers in search times and types of errors. Results of multiple regression analyses of global clutter, local clutter, range, target dimension, target complexity, number of targets, and experience on search times are given and discussed in terms search strategies.

Approved for public release; distribution is unlimited. AbstractThis report is a lexicon of terms developed by the Department of Defense Spatial Audio Display Working Group in an attempt to standardize terminology used by human factors researchers working in the area of auditory displays and human-machine communication. The lexicon has been primarily developed for the U.S. armed forces research groups, but it is hoped that it will be also useful for other Government academic, and industrial organizations. In addition to definitions specific to auditory displays, speech communication, and audio technology, the lexicon includes several terms unique to military operational environments and human factors engineering applications. Furthermore, human factors researchers appear to be increasingly interested in conducting integrated studies of auditory and visual perception in order to answer broad questions related to human situational awareness and performance. Therefore, the lexicon also includes some definitions related to visual perception, particularly in the areas of visual displays, virtual reality, and communication symbology. ACKNOWLEDGMENTSThe authors would like to thank Carolyn Bennett

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