2019 Volume 4 Issue 1 Pages 11-19
This study examined how two factors of ship navigation, multitasking and vibration, degrade visual attention. In Experiments 1 and 2, 11 and 20 participants, respectively, viewed a 1-min ship-navigation video and performed two tasks: one detecting as quickly as possible a small target presented for 0.3 sec in the video, and the other carrying out the detection task while performing mental calculations. In Experiment 1, the participant’s chair was stationary, and in Experiment 2, it pitched or rolled to induce vibration (or body sway), as if on a ship. Reaction time (RT) to the target and rate of oversight (RO) were indices of visual attention. In Experiment 1, the type of task affected RT but not RO. In Experiment 2, the task effect diminished for RT but was observed for RO. Furthermore, roll and pitch affected RT but not RO. The results suggest that inclusion of mental calculation and simulated ship motion can degrade visual attention, and the degree of the degradation differs depending on the index used for assessment. We discuss the implication of the results for marine accidents.