  Cognitive load assessment is crucial for understanding human performance in
various domains. This study investigates the impact of different task
conditions and time constraints on cognitive load using multiple measures,
including subjective evaluations, performance metrics, and physiological
eye-tracking data. Fifteen participants completed a series of primary and
secondary tasks with different time limits. The NASA-TLX questionnaire,
reaction time, inverse efficiency score, and eye-related features (blink,
saccade, and fixation frequency) were utilized to assess cognitive load. The
study results show significant differences in the level of cognitive load
required for different tasks and when under time constraints. The study also
found that there was a positive correlation (r = 0.331, p = 0.014) between how
often participants blinked their eyes and the level of cognitive load required
but a negative correlation (r = -0.290, p = 0.032) between how often
participants made quick eye movements (saccades) and the level of cognitive
load required. Additionally, the analysis revealed a significant negative
correlation (r = -0.347, p = 0.009) and (r = -0.370, p = 0.005) between
fixation and saccade frequencies under time constraints.
