The dimensional complexity of the EEG during cognitive tasks reflects the impaired information processing in schizophrenic patients.

The aim of the present study was to investigate whether schizophrenic patients show a different change of the dimensional complexity of the EEG, as represented by the Grassberger-Procaccia correlation dimension D(2,) under cognitive challenge compared to normal control subjects. With respect to results reported in the literature, it was expected that the complexity of the signal under cognitive challenge is higher in schizophrenic patients than in normal control subjects reflecting the impaired information processing abilities of the patients. Eighty-seven schizophrenic and 30 matched control subjects performed two different types of the continuous performance task.

[The fractal dimension as an imaging parameter in CT scans of patients with anorexia nervosa before and after therapy].

Brain development is a self-organizing process and hence the brain structures correspond to a highly recursive system consisting of a multitude of parts. Quantitative analysis of recursive, self-similar structures is possible in CT scans as what is termed synergistic diagnostic using the fractal dimension. In 10 patients with anorexia nervosa (ICD-10, F50.

Discrimination of Alzheimer's disease and normal aging by EEG data.

Quantitative EEG results in Alzheimer's disease may be summarized by the term 'slowing', i.e. slow frequencies (delta, theta) are increased and fast frequencies (alpha, beta) are decreased.

[Degree of disability of demented patients as judged by relatives and experts (disability insurance)].

Health insurance companies commission medical expert opinions rating the severity of clinical improvement in order to provide adequate nursing support. We compared these ratings on 28 demented patients with the ratings from carers and with our own examination. The results indicate that the expert opinions underestimated the severity of improvement and adequate support in some of the cases.

[Self and informant perception of clinical manifestations of Alzheimer dementia: results of a structured interview (CAMDEX)].

The correlations between (a) the patients' memory complaints, (b) the informants' rating of the patients' cognitive impairment, and (c) cognitive performance according to the Cambridge Examination for Mental Disorders of the Elderly (CAMDEX) were examined in 163 patients with probable or possible Alzheimer's disease. The patients' complaints were weakly correlated with informants' view (p < 0.05), closely correlated with depressive mood (p < 0.