COGNITIVE FUNCTION, FATIGUE, PSYCHOMOTOR VIGILANCE TASK, SLEEP DEPRIVATION, SUSTAINED ATTENTION TEST, TRAIN SIMULATOR.

• Main Author: THERESIA, CLARA
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/26302
• Institution: Institut Teknologi Bandung

Sleepiness and drowsiness are the factors which contribute to the accidents in transportation. While the effects of sleep deprivation on cognitive function have been reported, the exact relationships remain a critical issue. This study aimed to test how much the quantity of sleep affects the level of alertness and performance. A total of 12 male participants were required to drive a train simulator for 4 hours. Each participant experienced three treatment of sleep conditions such as normal 8 hours (Mean=7.79; SD=0.58), moderate 4 hours (Mean= 4.4; SD= 1.1) and extreme 2 hours (Mean=2.3; SD=0.3) at the night before experiment. A series of objective tests, including Psychomotor Vigilance Task (PVT) and Sustained Attention Test (SAT) were tested before and after the driving simulation. Meanwhile, the driving performance was tested using the number of speed limit violations. Test results of ANOVA showed that all parameters on PVT (PVT-mean, PVT-1apse, PVT-fastest and PVT-slowest) and SAT-number of miss parameters on SAT test has a significant difference of sleep condition with 2 hours and 8 hours duration. Different results were obtained on RT850 parameter in SAT test, the result showed no significant difference to the sleep condition of the participants. In this study, we conclude that the quantity of sleep is less influential cognitive function (3%-41%) while cognitive aspect became one of important aspect in the examination of fitness for duty for train driver. Secondly, sleep deprivation has negative impact on driving performance where there is an increase in speed limit violations of more than 50%. Lastly, lack of sleep quantity leads to decreased alertness and a doubling in sleepiness score after more than two hours of driving which needed intervention like visual or audio alarm to prevent occurrence of collision and accident.