Attention anomalies as measured by time estimation under G stress

To investigate attention anomalies under G stress, performance tests involving the estimation of time duration were conducted at sustained levels of 1 G/sub z/, 3 G/sub z/, and 5 G/sub z/ stress for a duration of 60. Two types of time-estimation tasks were conducted, counting and noncounting. Analysis of these data across all subjects indicates that the estimation of the minimum-duration counting task was grossly underestimated. Data were first analyzed across all subjects, and only the shortest counting task was affected by the 5 G/sub z/ stress condition. Overall, however, for a given stress level, the counting task was much more accurate a method of estimating time than noncounting. The 5 G/sub z/ stress level was slightly below the threshold to affect performance; however, for the documented case of one subject under great mental stress, his results were significantly affected by the combination of 5 G/sub z/ stress and the psychological stress. This effort has identified the 5 G/sub z/ stressor as the level at which performance begins to degrade, subject to the level of mental stress experienced by the subject.<>