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Severity of insomnia correlates with cognitive impairment

100%

Szelenberger W. , Niemcewicz S.

tom 60

nr 3

Portable, computer paperless system for human sleep analysis

80%

Pracki T. , Pracka D. , Szelenberger W.

1997

tom 57

nr 5

Computer paperless sleep analyzing system

80%

Pracki T. , Pracka D. , Szelenberger W. , Chesy G.

nr 5

Pharmaco-EEG analysis by means of FFT and FAD

71%

Szelenberger W. , Skalski M. , Franaszczuk P. , Mitraszewski P. , Blinowska K.

1989

tom 40

nr 4

Szelenberger, W., Skalski, M., Franaszczuk, P., Mitraszewski, P. and Blinowska K.: Pharmaco-EEG analysis by means of FFT and FAD. Acta physiol. pol., 1989, 40 (4): 423-430. The EEG effects of a single oral dose of diazepam, amitriptyline and pernazine were studied in 26 healthy volunteers. The EEG analysis was performed by means of FFT and a new parametric method FAD. The results indicate that the FAD method reveals drug changes significantly more often than does the FFT analysis and that the medication effects are more clearly defined by the FAD: The method can be useful in the assessment of the subtle effects of the psychotropic drugs.

Interhemispheric differences of sleep EEG complexity

70%

Szelenberger W. , Wackermann J. , Skalski M. , Drojewski J. , Niemcewicz S.

nr 4

EEG source activity during processing of neutral stimuli in subjects with anxiety disorders

51%

Gmaj B. , Januszko P. , Kaminski J. , Drozdowicz E. , Kopera M. , Wolynczyk-Gmaj D. , Szelenberger W. , Wojnar M.

nr 1

Anxiety disorders are a social problem due to their prevalence and consequences. It is crucial to explore the influence of anxiety on cognitive processes. In this study we recorded EEG activity from 73 subjects (35 patients, 38 controls, matched for age and education) during performance of the Continuous Attention Task. We used low resolution electromagnetic tomography (LORETA) for evaluation of mechanisms of impaired cognitive performance in anxiety disorders. Analysis showed that patients with anxiety disorders committed more errors than the controls, had a short latency of P300 and higher amplitude of ERPs at all steps of stimulus processing. Furthermore, we showed that there was a relationship between the scores of Hamilton Anxiety Scale and Beck Depression Inventory, and amplitudes and latencies of ERPs. The results of LORETA analysis showed that enhanced neural responses were found within circuits mediating visual information processing, sustained attention and anxiety. Also, we found higher current density within areas playing an important role in the brain fear network – anterior cingulate and anterior part of insula. Electrophysiological neuroimaging showed greater recruitment of cognitive resources in anxiety disorders, evidenced by higher current density and activation of greater number of brain areas. Despite the strategy employed to compensate for cognitive problems, the anxiety patients did not achieve the same performance as controls. Present study demonstrates that anxiety disorders influence processing of neutral stimuli and this influence is observable at both behavioral and electrophysiological level. The data suggests instability of neural systems responsible for information selection, working memory, engagement and focusing of attention.