Veränderung der elektrischen Hirnaktivität während Vigilanzuntersuchungen im Hinblick auf unterschiedliche motivationale Testbedingungen

Christina Saßmannshausen, Koehler, Ulrich (Prof. Dr.), Innere Medizin
2018
Introduction and method: In the Center of Sleep-Medicine at Philipps-Universtiy Marburg daytime drowsiness and reduction of vigilance are currently under examination by using both a Marburg developed quadruple-choice reaction time test called VigiMar and by a pupillografic PST drowsiness test. Both of these vigilance-tests were carried out on brain electrical correlates of reduction of vigilance and sleepiness with the help of EEG-tests. Furthermore we tested how differently, high-motivation
more » ... high-motivation was shown in the EEG-test results. Brain electrical activity during the night, and test results obtained the following day, were also taken into consideration. From October 2012 to September 2013 we tested 20 student assistants from the Center of Sleep medicine after having worked nights and with moderate sleep deprivation (average sleep 2.25 hours), while carrying out VigiMar and PST and making EEG recordings. Every proband was examined twice: Once under the test condition "Reward" and once under the test condition "Participation". Test condition "Reward" meant that the experimentee could receive a payment up to 400 Euros according to how awake they were. Under test condition "Participation" there was only a flat sum of 25 Euros offered, irrespective of the results of the tests. The relative and absolute power in the frequency bands Delta (0.5-4.0 Hz), Theta (4.0-8.2 Hz), Alpha (8.0-13 Hz), Beta (13-30 Hz) and Gamma (30-70 Hz) was calculated from the EEG recordings. In addition, the total power from each band was determined. Results: High Alpha and Theta activity during the VigiMar correlated with slower reaction times, meaning lower vigilance. High total power, Delta, Beta and Gamma activity on the other hand was accompanied by shorter reaction times and consequently higher vigilance. The correlation between high Beta and Gamma-activity and vigilance was more distinct under conditions of reward than under conditions of participation. In the PST the correlation was not as clearly marked but a hig [...]
doi:10.17192/z2018.0420 fatcat:icpihbmfg5ajlglq3f7sxvo7uq