This book constitutes the refereed proceedings of the 5th International Symposium on Human Mental Workload: Models and Applications, H-WORKLOAD 2021, held virtually in November 2021.The volume presents 9 revised full papers, which were carefully reviewed and selected from 16 submissions.

Models.- In search of the redline: perspectives on mental workload and the ‘underload problem’. - A novel parabolic model of instructional efficiency grounded on ideal mental workload and performance.- Radical Connectionism – Implications for Mental Workload Research.- Fundamental Frequency as an Alternative Method for Assessing Mental Fatigue of Distance Learning Teachers.- A systematic review of older drivers in a level 3 autonomous vehicle: A cognitive load perspective.- Applications.- On EEG Preprocessing Role in Deep Learning Effectiveness for Mental Workload Classification.- Mental Workload Assessment in Military Pilots Using Flight Simulators and Physiological Sensors.- Exploring the Influence of Information Overload, Internet Addiction, and Social Network Addiction, on Students' Well-being and Academic Outcomes.- Examining Cognitive Workload during Covid-19: A Qualitative Study.- The Relationship between Workload,Fatigue and Sleep Quality of Psychiatric Staff.

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