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Event-related P300 potentials are closely reflecting cognitive functions such as stimulus evaluation time (P300 latency) and task relevance (P300 amplitude). Hence, both their potential clinical application for detecting slight cognitive disturbances and an increasing interest in the aging of cognitive human brain functions resulted in a growing number of(More)
We investigated the influence of eye dominance scaled by 6 tests on the parameters (N80, P100 latency and N80-P100 amplitude) of the white-black-, green-black-, red-black- and blue-black-pattern visual evoked potentials (PVEPs) of 40 healthy subjects (20 males and 20 females) with normal visual acuity. The P100 latency of the white-black PVEPs was, for both(More)
The dynamics of cognitive brain functions of 104 patients with both chronic non-cirrhotic (NC) and cirrhotic liver disease (C: C1, non-encephalopathic; C2, encephalopathic) were investigated by means of visual P300 potentials elicited in both the paradigms of transient (PI) and selective attention (PII). Conventional PVEPs, psychometric tests and(More)
Visual event-related P300 potentials, conventional visual evoked potentials, and psychometric tests were applied to patients with noncirrhotic chronic liver disease and to clinically nonencephalopathic and encephalopathic cirrhotics to compare their diagnostic efficacy in detecting early portosystemic encephalopathy (PSE). Sixty-four investigations were(More)
For neurological purposes we developed a new method for eliciting P300-waves: Using two different kinds of checkerboard stimuli that were randomly flashed on a TV screen we obtained, besides the well-known usable primary complex, prominent PF-P300-complexes consisting of a marked negative potential (= N250), the PFP300a and the N400 peaks. These components(More)
A one-dimensional mathematical model is developed and implemented to describe the coupled transport of citrate-stabilized silver nanoparticles (nAg) and dissolved silver ions in porous media. This hybrid numerical simulator employs an Eulerian finite difference (FD) method to model the reactive transport of dissolved constituents and a Lagrangian(More)
The method of Pattern Flash elicited P300 (PFP300) has been applied to evaluate the dynamic alterations in cognitive function of a 58 year old woman (H. C.) presenting with hepatic failure due to fulminant hepatitis Non-A-Non-B. At the time of the first investigation she complained about slight memory deficits and revealed signs of hepatic encephalopathy(More)
For studying the relationship between the PFP300 (Pattern Flash elicited P300) and age we investigated 73 healthy subjects - 34 males, 39 females - between 18 and 60 years of age by presenting randomly two different checkerboards A (16 X 16 caskets visual angle = 50') and B (64 X 64 caskets visual angle = 12.5') to them (A:B = 80:20). The subjects' task was(More)