Experts showed an increasing trend in cognitive-load indices for pupillometry and cardiac signals from low to high complexity, with a steady increase or constant variation between low and medium complexity.
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Determining Cognitive Workload Using Physiological Measurements: Pupillometry and Heart-Rate Variability.
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The sentences
Statistical Analysis for Cognitive-Workload Indices The statistical analysis of pupillometry and cardiac cognitive-load indices showed highly significant differences between task-complexity stages.