earticle

영어

Mobile phone use while walking can cause dual-task interference and increases safety risks by increasing attentional and cognitive demands. While the interference effect on cognitive function has been examined extensively, how perception of the environment and walking dynamics are affected by mobile phone use while walking is not well understood. The amount of visual information loss and its consequent impact on dy-namic walking stability was examined in this study. Young adults (mean, 20.3 years) volunteered and walked on a treadmill while texting and at-tending to visual tasks simultaneously. Performance of visual task, field of regard loss, and margin of stability under dual-task conditions were compared with those of single-task conditions (i.e., visual task only). The results revealed that the size of visual field and visual acuity de-mand were varied across the visual task conditions. Approximately half of the visual cues provided during texting while walking were not per-ceived as compared to the visual task only condition. The field of regard loss also increased with increased dual-task cost of mobile phone use. Dynamic walking stability, however, showed no significant differences between the conditions. Taken together, the results demonstrate that the loss of situational awareness is unavoidable and occurs simultane-ously with decrements in concurrent task performance. The study indi-cates the importance of considering the nature of attentional resources for the studies in dual-task paradigm and may provide practical infor-mation to improve the safe use of mobile phones while walking.