The use of exoskeletons in construction has the potential to enhance worker ergonomics and reduce musculoskeletal injuries by augmenting physical support during labor-intensive tasks. However, growing evidence suggests that exoskeletons, particularly active back-support exoskeletons (aBSEs), may unintentionally impair cognitive and perceptual performance due to biomechanical mismatches and elevated mental workload. This study investigates the effects of aBSE use on visual attention, situational awareness, and visual cognitive load during a construction-related task. An experimental study was conducted with sixteen participants using eye-tracking, electroencephalography (EEG), and the Situational Awareness Rating Technique (SART) to collect both objective and subjective data from participants performing the task with and without the exoskeleton. The results showed that aBSE use slightly reduces fixation-based metrics and significantly reduces saccade-based metrics across task-related areas of interest among the participants, indicating diminished visual attention. SART scores were notably lower among 60 % of the participants when using the exoskeleton, reflecting reduced situational awareness. Pupillometry and occipital EEG theta activity both significantly increased among the participants, indicating heightened visual cognitive load during aBSE use. These findings suggest that the cognitive demands associated with motor coordination and planning while using aBSEs may deplete attentional resources. This study makes several contributions: it applies and extends Kahneman's Capacity Model to explain how cognitive resource limitations manifest during exoskeleton-assisted work. The findings show that aBSEs can impair visual attention and situational awareness, underscoring the need for user-centered design and targeted training to help workers manage attention and safety risks during initial use.
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