Paroxysmal brain state changes, such as microsleep events in drivers, are presumably subcortically induced and accompanied by cortical processes. This raises questions of how stable and persistent are the cortical processes that can be observed with EEG in real time. For this purpose, recordings of four night-driving simulation studies including 79...
Martin Patrick Pauli Constantin Pohl Martin Golz
Inter-individual differences in the feature distribution of electroencephalograms (EEG) during microsleep (MS) raise questions about the generalizability of the methodology, because methodology should have the same validity for subjects to be included in the analysis in the future as for subjects included so far. We address this question using leav...
Martin Patrick Pauli Constantin Pohl Martin Golz
GMLVQ (Generalized Matrix Relevance Learning Vector Quantization) is a method of machine learning with an adaptive metric. While training, the prototype vectors as well as the weight matrix of the metric are adapted simultaneously. The method is presented in more detail and compared with other machine learning methods employing a fixed metric. It w...
Martin Golz Sebastian Thomas Adolf Schenka
Martin Lachmann Tilman Stark Martin Golz Eberhard Manske
The circadian rhythm that drives the human sleepwake cycle manifests itself in the variation of the core body temperature (CBT). Measuring CBT continuously, however, is intricate. Heart rate and its variability also varies notably over the course of the day, but is more accessible to measure. We present first results from a study that investigates...
Christian Heinze Martin Golz
This paper examines the question of how strongly the spectral properties of the EEG during microsleep differ between individuals. For this purpose, 3859 microsleep examples were compared with 4044 counterexamples in which drivers were very drowsy but were able to perform the driving task. Two types of signal features were compared: logarithmic powe...
Martin Golz Adolf Schenka Florian Haselbeck Martin Patrick Pauli
David Sommer Martin Golz Thomas Schnupp David J Edwards
Jarek Krajewski David Sommer Udo Trutschel Martin Golz
Martin Golz David Sommer Jarek Krajewski David J Edwards
Martin Golz David Sommer Jarek Krajewski
Udo Trutschel Bill Sirois David Sommer David J Edwards
Automatic relevance determination (ARD) was applied to two-channel EOG recordings for microsleep event (MSE) recognition. 10 s immediately before MSE and also before counterexamples of fatigued, but attentive driving were analysed. Two type of signal features were extracted: the maximum cross correlation (MaxCC) and logarithmic power spectral densi...
Martin Golz Sebastian Wollner David Sommer Sebastian Schnieder
It was investigated whether cognitive performance shows a circadian rhythm during a 50 h-long forced desynchrony sleep-wake-schedule. We asked whether it would be possible to estimate the circadian period of cognitive performance under such circumstances and how strong it correlates to subjective sleepiness rating as well as body temperature. Cogni...
Thomas Schnupp Christian Heinze Martin Golz
Automatic relevance determination (ARD) was applied to two-channel EOG recordings for microsleep event (MSE) recognition. 10 s immediately before MSE and also before counterexamples of fatigued, but attentive driving were analysed. Two type of signal features were extracted: the maximum cross correlation (MaxCC) and logarithmic power spectral densi...
Martin Golz Sebastian Wollner David Sommer Sebastian Schnieder
We examined if ECG-based features are discrimi-native towards drowsiness. Twenty-five volunteers (19–32 years) completed 7×40 minutes of monotonous overnight driving simulation, designed to induce drowsiness. ECG (512 s-1) was recorded continuously; subjective ratings of drowsiness on the Karolinska sleepiness scale (KSS) were polled every five min...
Christian Heinze Constantin Hütterer Thomas Schnupp Martin Golz
This contribution addresses the question if imminent changes of the cortical state are predictable. The analysis is based on 1484 examples of microsleep (MS) and 1940 counterexamples of sustained attention (SA), both observed during overnight driving in the simulator. EEG segments (8 s in length) immediately before each respective event were includ...
Martin Golz David Sommer Jarek Krajewski
Microsleep events (MSE) are short intrusions of sleep under the demand of sustained attention. They can impose a major threat to safety while driving a car and are considered one of the most significant causes of traffic accidents. Driver’s fatigue and MSE account for up to 20% of all car crashes in Europe and at least 100,000 accidents in the US e...
Gustavo Lenis Patrick Reichensperger David Sommer Olaf Dössel
Karel Marsalek René Gerber Martin Golz Alexander Gundel
EEG related sleepiness measures were investigated with regard to three hypotheses. Measures of sleepiness should increase with time since sleep as well as with time on task, and they should also increase shortly before a sleepiness related crash in the driving simulator occurs. For this purpose, power spectral densities in the alpha, theta and in t...
Martin Golz David Sommer Britta Geißler Axel Muttray
Martin Golz David Sommer
Gambardella et al (1999) introduced the Multiple Ant Colony System (MACS) for Vehicle Routing Problems with Time Windows (VRPTW) and demonstrated its eff ectiveness of this meta-heuristic optimization approach to solve constrained NP-hard vehicle routing problems. Cordón (2002a) reviewed variations of MACS-VRPTW. With realistic travel durations and...
Udo Trutschel Sven Schirmer Martin Golz
Gambardella et al (1999) introduced the Multiple Ant Colony System (MACS) for Vehicle Routing Problems with Time Windows (VRPTW) and demonstrated its eff ectiveness of this meta-heuristic optimization approach to solve constrained NP-hard vehicle routing problems. Cordón (2002a) reviewed variations of MACS-VRPTW. With realistic travel durations and...
Udo Trutschel Sven Schirmer Martin Golz
Recently, it has been shown by overnight driving simulation studies that microsleep density is the only known sleepiness indicator which rapidly increases within a few seconds immediately before sleepiness related crashes. This indicator is based solely on EEG and EOG and subsequent adaptive pattern recognition. Accurate microsleep recognition is v...
Martin Golz Adolf Schenka David Sommer A. Muttray
Martin Golz Adolf Schenka David Sommer A. Muttray
Martin Golz David Sommer Jarek Krajewski
