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OCR for page 82
HUMAN FACTORS IN THE DESIGN OF TACTICAL DISPLAY SYSTEMS FOR THE INDIVIDUAL SOLDIER: PHASE I DEFINITION OF SELECTED TERMS 21 CLW 21st Century Land Warrior Accommodation The automatic adjustment of the eyes to achieve focus on objects at different distances from the viewer. Adaptation The automatic adjustment of the pupil in response to different levels of ambient illumination. Attention narrowing Limiting attention to only one object, class of objects, or sensory channel out of the full perceptual domain--implies possible loss of valuable information. Built-in test equipment Computer-based devices that automatically conduct fault detection procedures. Center of gravity The physical center of gravity of a person's body together with all attached equipment. Cognitive capability The upper limit of a person's ability to process incoming information such that useful conclusions or actions follow. Conformality The degree of agreement or match between two superimposed images--as in a see-through display that generates a synthetic outline of an object that is in the field of view and superimposes the outline on the image of the object. Cue Information (e.g., a visual signal) that is directive--that points to a particular interpretation or next step.
OCR for page 83
HUMAN FACTORS IN THE DESIGN OF TACTICAL DISPLAY SYSTEMS FOR THE INDIVIDUAL SOLDIER: PHASE I Manpower and Personnel Integration (MANPRINT) A formal procedure adopted by the U.S. Army to help ensure the operational effectiveness of human-machine systems. Situation awareness Generically, the perception of the elements in the environment within a volume of time and space, the comprehension of their meaning, and the projection of their status in the near future. For a dismounted soldier, it incorporates such specifics as the location of hostile elements relative to one's own position and the status of one's own equipment particularly weapons. Spatial disorientation Loss of the perception of one's bodily position in space in relation to some fixed reference object--e.g., the inability to distinguish up from down. TOW Tube launched, Optically aimed, Wire guided anti-tank missile. Vergence The position (aim line) of one eye relative to the position (aim line) of the other eye. Visual rivalry The condition whereby two objects in the visual field elicit attention at the same time but require different ocular orientation or accommodation. If each eye has a different field of view, the image from one eye can be excluded from perceptual awareness--i.e., suppressed. Workload The perceived volume of response demands relative to the ability to generate the required responses--i.e., a high workload is one that occupies all or nearly all of a worker's capabilities.
OCR for page 84
HUMAN FACTORS IN THE DESIGN OF TACTICAL DISPLAY SYSTEMS FOR THE INDIVIDUAL SOLDIER: PHASE I This page in the original is blank.
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