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180 results on '"Jokeit H"'

4. The Wada test in Austrian, Dutch, German, and Swiss epilepsy centers from 2000 to 2005: a review of 1421 procedures

Author

Haag, A., Knake, S., Hamer, H.M., Boesebeck, F., Freitag, H., Schulz, R., Baum, P., Helmstaedter, C., Wellmer, J., Urbach, H., Hopp, P., Mayer, T., Hufnagel, A., Jokeit, H., Lerche, H., Uttner, I., Meencke, H.-J., Meierkord, H., Pauli, E., Runge, U., Saar, J., Trinka, E., Benke, T., Vulliemoz, S., Wiegand, G., Stephani, U., Wieser, H.G., Rating, D., Werhahn, K., Noachtar, S., Schulze-Bonhage, A., Wagner, K., Alpherts, W.C.J., Boas, W. van Emde, and Rosenow, F.

Published
2008
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11. Different event-related patterns of gamma-band power in brain waves of fast- and slow-reacting subjects

Author

Jokeit, H. and Makeig, S.

Subjects
Electroencephalography -- Analysis, Auditory evoked response -- Physiological aspects, Science and technology
Abstract

Auditory stimuli exhibit different patterns of gamma-bond electroencephalogram (EEG) for fast- and slow-reacting subjects. Event-related brain processes result from event-related changes in EEG amplitude, which is recorded from the human scalp. Sensorimeter processing is influenced through gamma-band activity. Gamma-band filtered event-related potential can not differentiate between two groups or conditions.

Published
1994

19. The Wada-Test in 2000–2005at German, Swiss and Austrian and Dutch Epilepsy-Centres – the experience of the Arbeitsgemeinschaft für prächirurgische Epilepsiediagnostik und operative Epilepsietherapie e.V regarding 1421 procedures

Author

Haag, A, Knake, S, Hamer, HM, Boesebeck, F, Freitag, H, Schulz, R, Baum, P, Helmstaedter, C, Wellmer, J, Urbach, H, Hopp, P, Mayer, T, Hufnagel, A, Jokeit, H, Lerche, H, Uttner, I, Meencke, HJ, Meierkord, H, Pauli, E, Runge, U, Saar, J, Trinka, E, Benke, T, Vulliemoz, S, Wiegand, G, Stephani, U, Wieser, HG, Rating, D, Werhahn, K, Noachtar, S, Schulze-Bonhage, A, Wagner, K, Alpherts, W, van Emde Boas, W, and Rosenow, F

Published
2024
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23. Word Processing and Gamma Band Activity

Author

Müller, Horst M. and Jokeit, H.

Subjects
Sprache, Spektralanalyse, Neurolinguistik, EEG
Abstract

psyc.94.5.60.brain-rhythms.5.mueller

Published
1994

28. The Wada-Test in 2000–2005at German, Swiss and Austrian and Dutch Epilepsy-Centres – the experience of the Arbeitsgemeinschaft für prächirurgische Epilepsiediagnostik und operative Epilepsietherapie e.V regarding 1421 procedures

Author

Haag, A, primary, Knake, S, additional, Hamer, HM, additional, Boesebeck, F, additional, Freitag, H, additional, Schulz, R, additional, Baum, P, additional, Helmstaedter, C, additional, Wellmer, J, additional, Urbach, H, additional, Hopp, P, additional, Mayer, T, additional, Hufnagel, A, additional, Jokeit, H, additional, Lerche, H, additional, Uttner, I, additional, Meencke, HJ, additional, Meierkord, H, additional, Pauli, E, additional, Runge, U, additional, Saar, J, additional, Trinka, E, additional, Benke, T, additional, Vulliemoz, S, additional, Wiegand, G, additional, Stephani, U, additional, Wieser, HG, additional, Rating, D, additional, Werhahn, K, additional, Noachtar, S, additional, Schulze-Bonhage, A, additional, Wagner, K, additional, Alpherts, W, additional, van Emde Boas, W, additional, and Rosenow, F, additional

Published
2007
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30. Long term effects of refractory temporal lobe epilepsy on cognitive abilities: a cross sectional study.

Author

Jokeit H, Ebner A, Jokeit, H, and Ebner, A

Abstract

Objective: Intractable epilepsy is related to various transient and chronic brain electric and neurochemical disturbances. There is increasing evidence that chronic epilepsy induces secondary neuronal metabolic and structural decline. However, there is no convincing evidence that the cognitive abilities of patients deteriorate with increasing duration of intractable epilepsy.Methods: To examine whether duration of refractory temporal lobe epilepsy (TLE) is related to generalised cognitive impairment, psychometric intelligence based on the full scale intelligence quotient (FSIQ, WAIS-R) was determined in 209 patients with unilateral TLE. For analyses of variance (ANOVA) patients were grouped into three categories: <15, 15-30, and >30 years of refractory TLE.Results: An ANOVA and a multiple regression analysis showed that duration of TLE affects FSIQ. Patients with >30 years of TLE performed worse than patients with 15 or 30 years of TLE. The factors side of seizure origin and type of lesion on MRI did not reach significance. A second ANOVA including education as factor showed that in patients with higher educational attainment, the mean FSIQ was stable for a longer duration of TLE than in less educated patients. Retesting 6 months after anterior temporal lobectomy seizure free patients (n=85 of 127) had an higher FSIQ but showed a similar duration effect before and after anterior temporal lobectomy. The variables age at epilepsy onset, education, frequency of interictal epileptiform discharges, frequency of habitual and generalised seizures, serum concentration of antiepileptic drugs, and polypharmacy were statistically controlled.Conclusions: Psychometric intelligence of patients with a longer duration of refractory TLE were most severely impaired. Consequently, refractory TLE seems to be associated with slow but ongoing cognitive deterioration. It is assumed that epilepsy related noxious events and agents exhaust the compensatory capacity of brain functions. However, as in dementia and Alzheimer's disease, higher educational attainment as an indicator of higher brain reserve might delay the cognitive decline. [ABSTRACT FROM AUTHOR]

Published
1999
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42. Event-Related Changes in the 40 Hz Electroencephalogram in Auditory and Visual Reaction Time Tasks

Author

NAVAL HEALTH RESEARCH CENTER SAN DIEGO CA, Jokeit, H., Goertzl, R., Kuchleri, E., Makeig, S., NAVAL HEALTH RESEARCH CENTER SAN DIEGO CA, Jokeit, H., Goertzl, R., Kuchleri, E., and Makeig, S.

Abstract

Mean motor response times (MRT) to expected stimuli can differ considerable between subjects even when experimental conditions are stable. It is well known that central rather than peripheral processes are mainly responsible for these differences. However, questions remain open whether and which measures of neuroelectrical brain activity can reveal significant aspects of the underlying sensorimotor processes. A number of studies using event-related brain potentials have yielded only small or insignificant correlations between electrophysiological measures and motor reaction times. To compute 40Hz band event-related spectra (ERS), each response epoch was first band pass filtered from 20-60 Hz. The epochs were then divided into 68 overlappping 24-point (96ms) time windows with a shift interval of 8 ms. After tapering using a Gaussian window function, and zero-padding to 64 points, each window was converted to spectral power using an FFT. Since gamma band power was interrupted by the 50 Hz notch filter used in the recording, the range 35 to 43 Hz was chosen for analysis. Power in this range was integrated for each time point using a Hamming window function . The 40 Hz ERS transform of each epoch thus consisted of 68 power estimates at 8ms intervals. Statistical significance of response differences in the measures was tested by repeated measures analysis of variance (RM-ANOVA), by Bonferroni-corrected t-tests for dependent samples, and by t- tests for independent samples. Threshold of significance was considered to be p<0.01..

Published
1994

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