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Prediction of Micro - Sleeps Based on Thalamo - Cortical Oscillations

Prediction of Micro - Sleeps Based on Thalamo - Cortical Oscillations. COL. Václav PŘENOSIL tel.: +420 5 41182155 E-mail: prenosil@cs.vabo.cz Military Academy in Brno, Czech Republic. Accident losses. In the Czech Republic - 6 billion Czech Crowns in 1997.

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Prediction of Micro - Sleeps Based on Thalamo - Cortical Oscillations

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  1. Prediction of Micro - Sleeps Based on Thalamo - Cortical Oscillations COL. Václav PŘENOSIL tel.: +420 5 41182155 E-mail: prenosil@cs.vabo.cz Military Academy in Brno, Czech Republic IST, Orlando, July 14

  2. IST, Orlando, July 14

  3. Accident losses In the Czech Republic - 6 billion Czech Crowns in 1997. American statistics state that about 10% of all traffic accidents caused by micro-sleep. The estimation of losses caused by micro-sleeps of drivers in the Czech Republic in the last year amounted to about 600 million Czech Crowns (about 15 million US$). An assessment of secondary losses caused by micro-sleeps of drivers is much more difficult and needs more detailed analysis. Assuming that they are about 1/2 of primary losses, one arrives at a total figure of losses caused by drivers’ micro-sleeps on the roads and motorways in the Czech Republic in the range of about 900 million Czech Crowns in 1997 (about 22,5 million US$). IST, Orlando, July 14

  4. Discussion of the micro-sleeping Micro-sleep is such a state of the human organism, in which the mental vigilance and attention of the human operator controlling some artificial system decreases for a maximum acceptable time below a certain limit. Vigilance - The state of the organism, in which all its mental functions can be realized and when all receptor signals are accepted and well processed. Attention - The form of vigilance, when the dominant part of mental functions is concentrated on external objects (focused attention is considered as concentration to certain object). IST, Orlando, July 14

  5. Region of micro-sleep with open eyes Level of attention Region of micro-sleep with closed eyes LAT LATmin LATmin minimal acceptable level of attention tmsa t tms1 tms2 maximum acceptable time tmsa of micro – sleep with closed eyes time t in which the organism’s mental activity LAT is observed The definition of the phenomena of micro-sleep and its discussion. IST, Orlando, July 14

  6. Full control Artificial system Restricted control Depth of micro-sleep Basic input signals (stability, vibrations, etc.) Acoustic input signals Visual input signals Human brain Micro-sleep with closed eyes and no input Micro-sleep with closed eyes and limited input Slight micro-sleep with partial acoustic input Full attention Control functions in man-system interaction in the stay of micro-sleep IST, Orlando, July 14

  7. Method of the micro-sleep detection • founding of significant parameters • (cause -consequence) - markers • scanning of the time series • design of the predictor (forecasting) • design of the reliable scanning device IST, Orlando, July 14

  8. X2 RAAT |LAT| X1 X3 Idealized example of the attention curve (t) in the 3 dimensional space {X}AT IST, Orlando, July 14

  9. Amplitude of EEG signal     Frequency The slightly idealized plot of the EEG marker spectrum  IST, Orlando, July 14

  10. t Time Serie of the EEG spectrum U(fk,t) U1,2, (f) f fk Technique of generation of the time series IST, Orlando, July 14

  11. RT alpha Typical dependence between alpha and RT IST, Orlando, July 14

  12. RT delta Typical dependence between delta and RT IST, Orlando, July 14

  13. RT P Example of dependence between the reaction time RT and the probability P of wrong response. IST, Orlando, July 14

  14. RAAT{, } Area of micro-sleep alpha Region of acceptable attention Y EEG { t,t} t delta Example of the projection of the EEG(t) curve in the EEG space to the plane {alpha, delta} IST, Orlando, July 14

  15. 3D map of the brain activity - careless IST, Orlando, July 14

  16. 3D map of the brain activity - easy task IST, Orlando, July 14

  17. 3D map of the brain activity - difficult task IST, Orlando, July 14

  18. Temporal EEG electrode Glasses with EEG electrodes The location of EEG electrodes for micro–sleep marker measurement. IST, Orlando, July 14

  19. IST, Orlando, July 14

  20. IST, Orlando, July 14

  21. IST, Orlando, July 14

  22. IST, Orlando, July 14

  23. Thank you for your attention. • COL. Václav PŘENOSIL, Ph.D. • Prof. Mirko NOVÁK, Dr.Sc. • Prof. Josef FABER M.D., Dr.Sc. • Dr. Ivan VALACH, • Lukáš VYDRA, MSc. IST, Orlando, July 14

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