ABSTRACT
The effect of cognitive and visual/perceptual fatigue on shift workers may not be the same for day-time workers since rotating shifts create enormous disruptions to the circadian rhythms of the workers. The purpose of this study was to measure the effect of fatigue on shift workers cognitive and visual/perceptual performance at the beginning and end of each shift during the workweek. The primary instrument used in this study was the Automated Performance Testing System (APTS), which is a human performance measuring system that contained eight various cognitive and temporal factors tests. The findings suggested that cognitive performance at the beginning of the shift was significantly higher than at the end of the shift.
