The purpose of the current study was to evaluate the current and two alternative cursors for B-2 ... more The purpose of the current study was to evaluate the current and two alternative cursors for B-2 Synthetic Aperture Radar (SAR) imagery application and to recommend an alternative design. This study was conducted in response to problems crewmembers are experiencing with the current cursor on the B-2 SAR display. In particular, the design of the current radar cursor (i.e., the
Sixteen USAF crew members participated in experiments evaluating cursor slewing performance with ... more Sixteen USAF crew members participated in experiments evaluating cursor slewing performance with the B-2 radar-embedded cursor system. Performance was evaluated with the current linear force/velocity function and an alternative sigmoidal function designed to elicit improved performance. One experiment utilized a radar update task requiring only fine positioning movements of the cursor. The second experiment consisted of a semi-operational targeting task in which both gross and fine positioning movements of the cursor were required. In addition, the effects of ambiguity of the target pixel and variability in cursor system processing delay were examined. In both experiments, the sigmoidal gain function elicited lower designation time and fewer overshoots than the linear function. Although accuracy of the final designation was not affected by gain function in either experiment, designation error was found to be less than one pixel when the target pixel was highlighted. Variability in t...
green color-discrimination thresholds were measured at eccentricities of 10 and 25 deg in the nas... more green color-discrimination thresholds were measured at eccentricities of 10 and 25 deg in the nasal retina. Thresholds were measured as a function of stimulus field size both during the cone plateau and after dark adaptation. During the cone plateau, threshold decreased with increasing field size, but the effect of field size was dependent on the color of the test stimulus. The decrease in threshold was greater for yellow and orange test stimuli than for red and green tests. Two factors, summation and opponent-mechanism adaptation, appear to affect the relation between threshold and field size. An equation suggested by Kambe in 1980 [Color Res. Appl. 5, 13 (1980)] provides a good description of the variation in thresholds with field size and eccentricity. After dark adaptation, thresholds increased for all test colors, suggesting that rod signals reduce discrimination. The dark-adapted thresholds could be described well by the addition of a rod term to the Boynton-Kambe equation.
This paper describes a research program that is developing more robust algorithms for The Improve... more This paper describes a research program that is developing more robust algorithms for The Improved Performance Research Integration Tool (IMPRINT) that better reflect the complexity of the effects of training on human performance. The Air Force Research Laboratory's Warfighter Readiness Research Division is sponsoring a series of empirical studies to assess the effects of various training strategies on skill acquisition and retention in the performance of complex military tasks. New algorithms will be developed and populated based on the results of these studies. Ongoing research efforts are described. The relevance of this research for system designers is discussed.
The purpose of the current study was to evaluate the current and two alternative cursors for B-2 ... more The purpose of the current study was to evaluate the current and two alternative cursors for B-2 Synthetic Aperture Radar (SAR) imagery application and to recommend an alternative design. This study was conducted in response to problems crewmembers are experiencing with the current cursor on the B-2 SAR display. In particular, the design of the current radar cursor (i.e., the
Sixteen USAF crew members participated in experiments evaluating cursor slewing performance with ... more Sixteen USAF crew members participated in experiments evaluating cursor slewing performance with the B-2 radar-embedded cursor system. Performance was evaluated with the current linear force/velocity function and an alternative sigmoidal function designed to elicit improved performance. One experiment utilized a radar update task requiring only fine positioning movements of the cursor. The second experiment consisted of a semi-operational targeting task in which both gross and fine positioning movements of the cursor were required. In addition, the effects of ambiguity of the target pixel and variability in cursor system processing delay were examined. In both experiments, the sigmoidal gain function elicited lower designation time and fewer overshoots than the linear function. Although accuracy of the final designation was not affected by gain function in either experiment, designation error was found to be less than one pixel when the target pixel was highlighted. Variability in t...
green color-discrimination thresholds were measured at eccentricities of 10 and 25 deg in the nas... more green color-discrimination thresholds were measured at eccentricities of 10 and 25 deg in the nasal retina. Thresholds were measured as a function of stimulus field size both during the cone plateau and after dark adaptation. During the cone plateau, threshold decreased with increasing field size, but the effect of field size was dependent on the color of the test stimulus. The decrease in threshold was greater for yellow and orange test stimuli than for red and green tests. Two factors, summation and opponent-mechanism adaptation, appear to affect the relation between threshold and field size. An equation suggested by Kambe in 1980 [Color Res. Appl. 5, 13 (1980)] provides a good description of the variation in thresholds with field size and eccentricity. After dark adaptation, thresholds increased for all test colors, suggesting that rod signals reduce discrimination. The dark-adapted thresholds could be described well by the addition of a rod term to the Boynton-Kambe equation.
This paper describes a research program that is developing more robust algorithms for The Improve... more This paper describes a research program that is developing more robust algorithms for The Improved Performance Research Integration Tool (IMPRINT) that better reflect the complexity of the effects of training on human performance. The Air Force Research Laboratory's Warfighter Readiness Research Division is sponsoring a series of empirical studies to assess the effects of various training strategies on skill acquisition and retention in the performance of complex military tasks. New algorithms will be developed and populated based on the results of these studies. Ongoing research efforts are described. The relevance of this research for system designers is discussed.
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Papers by Jeffrey Doyal