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Peripheral Detection and Identification of Self-Luminous Display Variations in 'Ocean' and 'Harbor' Viewing Environments.

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Technical rept.,

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Effectiveness of a range of peripheral angles was examined for two visual tasks detection and identification and three display characteristics console distance, color and luminance in two kinds of underwater viewing environments, Ocean and Harbor. Peripheral angles ranged between 7 deg and 56 deg at six values for each of three Console Distances 25, 35 and 45 cm. All display locations were along the horizontal meridian perpendicular to the line of sight. Display colors were green and red and luminance was 100 ft-L in the Harbor turbidity condition and 0.1 ft-L in the Ocean. The two underwater viewing environments were simulations of the physical characteristics of suspended particles or organic materials which occur in natural oceans and harbors. Twelve dark-adapted observers, performed a continuous compensatory tracking task and monitored their performance by attending to a tracking display positioned along the line of sight at 0 deg eccentricity. After a few seconds of tracking, a self-luminous, 5-segment digit appeared at one of six peripheral locations. Observer indicated detection of the peripheral signal. Green display color was significantly more effective than red in peripheral effectiveness for the detection task in both turbidity conditions. Color differences were relatively unimportant to peripheral identification, although Green was consistently equal or superior to Red.

Subject Categories:

  • Anatomy and Physiology
  • Physical and Dynamic Oceanography
  • Optics
  • Human Factors Engineering and Man Machine Systems

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