1. Detecting and Monitoring Mental
Fatigue: A review
University of Minho
Department Of Informatics
André Pimenta – apimenta@di.uminho.pt
Paulo Novais – pjon@di.uminho.pt
José Neves – jneves@di.uminho.pt
February 14, 2014
DETECTING AND MONITORING MENTAL FATIGUE: A REVIEW
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2. Contents
Motivation Review
What is Fatigue?
Fatigue Detection
Fatigue Measures
Physiological Measures
Performance Measures
Subjective Measures
Others Factors
Conclusions
DETECTING AND MONITORING MENTAL FATIGUE: A REVIEW
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3. Motivation
Contribution to CAMCoF Project.
Analysis of a Human behavior.
Exposure Current systems
Different ways of fatigue detection
DETECTING AND MONITORING MENTAL FATIGUE: A REVIEW
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4. What is Fatigue?
Lack of energy, physical exertion, physical discomfort, lack of motivation, and
sleepiness.
◦ Mental fatigue: dificulties with concentration, attention, visual perception, and
somnolence.
◦ Physical fatigue: loss of muscle strength, speed or agility, thus limiting the performance
of physical tasks.
DETECTING AND MONITORING MENTAL FATIGUE: A REVIEW
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5. Categories of Fatigue?
◦ Acute Fatigue: which occurs normally between a pair of major sleep periods.
◦ Cumulative fatigue: which accumulates over period of days or weeks to the insufficient
recovery from successive periods of acute fatigue.
◦ Chronic fatigue: Psychoneurotic syndrome characterized by difficulty in committing
oneself to an aggressive course of action.
DETECTING AND MONITORING MENTAL FATIGUE: A REVIEW
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6. Application Contexts
Learning, Work, Productivity, Wellness and Health
DETECTING AND MONITORING MENTAL FATIGUE: A REVIEW
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7. Fatigue Detection
There are three different ways to detect and monitor mental fatigue:
◦ Physiological Measurements:
◦ Human Performance:
◦ Subjective Measures:
DETECTING AND MONITORING MENTAL FATIGUE: A REVIEW
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8. Physiological Measurements
A way of measuring mental fatigue is to measure the physiologies responses to
behaviours of mental fatigue, response is usually measured by the energy
expended in perform a set of tasks.
DETECTING AND MONITORING MENTAL FATIGUE: A REVIEW
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9. SmartCap
DETECTING AND MONITORING MENTAL FATIGUE: A REVIEW
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10. EyeCheck
DETECTING AND MONITORING MENTAL FATIGUE: A REVIEW
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11. Performance
Performance decrement due to fatigue may be considered as a function which
compares the time on task and the total quantity and/or quality of work
performed in a given unit of time.
Factors of influence:
Task difficulty;
Task workload;
Motivation;
Type of Task;
DETECTING AND MONITORING MENTAL FATIGUE: A REVIEW
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12. Fatigue Detection System
in Distance Education
DETECTING AND MONITORING MENTAL FATIGUE: A REVIEW
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13. Subjective Measures
Self-Report
Questionares
Fatigue Index
DETECTING AND MONITORING MENTAL FATIGUE: A REVIEW
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14. Fatigue Severity Scale (FSS)
DETECTING AND MONITORING MENTAL FATIGUE: A REVIEW
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15. NASA - TLX
DETECTING AND MONITORING MENTAL FATIGUE: A REVIEW
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16. Others Factors
Age - Defines the mental age of the individual. It is important to understand the
expected cognitive abilities of the individual, which may have a tendency to degrade
with old age.
 Gender - The mental states are different between men and women.
 Professional occupation - Many occupations are intrinsically more tiresome or
exhausting than others.
 Consumption of alcohol and drugs - The use of certain substances for short or
prolonged periods may cause dependencies and other effects that lead to a state
of mental fatigue.
DETECTING AND MONITORING MENTAL FATIGUE: A REVIEW
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17. Conclusions
There are three different ways to detect fatigue.
Current systems do not consider the environment information.
User profile is often not taken into account.
Objective measures typically used for vehicle drivers.
DETECTING AND MONITORING MENTAL FATIGUE: A REVIEW
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18. Detecting and Monitoring Mental
Fatigue: A review
University of Minho
Department Of Informatics
André Pimenta – apimenta@di.uminho.pt
Paulo Novais – pjon@di.uminho.pt
José Neves – jneves@di.uminho.pt
February 14, 2014
DETECTING AND MONITORING MENTAL FATIGUE: A REVIEW
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