Berger effect

The Berger effect (named after the psychiatrist and neurologist Hans Berger ; also called visual blockade ) describes the blockage of the α waves and their replacement by β waves in the electroencephalogram (EEG) when the subject opens them with closed eyes from a relaxed waking state.

The α-rhythm is therefore present in healthy, awake adults when they are relaxed and have their eyes closed. The frequency is 8–13 Hz and the signal amplitude is greatest over the occipital regions of the brain. Since this frequency is a kind of basic rhythm of the thalamus in the waking state and the cerebral cortex, so to speak, only “resonates”, one speaks of a synchronized electroencephalography.

Individual evidence

↑ Günter Krämer: Epilepsy from A – Z. Understand medical terms . TRIAS, Stuttgart 2005, ISBN 3-8304-3229-1 , p. 115 ff., 405 ff . ( limited preview in Google Book search).
^ Berger effect
↑ Manfred Stöhr, Regina Kraus: Introduction to clinical neurophysiology. EMG, EEG, evoked potentials  . with 17 tables. Springer, Berlin 2002, ISBN 3-7985-1321-X , p. 60 ff . ( limited preview in Google Book search).
↑ Jens Huppelsberg, Kerstin Walter: Short textbook physiology . Georg Thieme, Stuttgart / New York, ISBN 3-13-136432-7 .

[1] Günter Krämer: Epilepsy from A – Z. Understand medical terms . TRIAS, Stuttgart 2005, ISBN 3-8304-3229-1 , p. 115 ff., 405 ff . ( limited preview in Google Book search).

[2] Berger effect

[Stöhr2002-3] Manfred Stöhr, Regina Kraus: Introduction to clinical neurophysiology. EMG, EEG, evoked potentials  . with 17 tables. Springer, Berlin 2002, ISBN 3-7985-1321-X , p. 60 ff . ( limited preview in Google Book search).

[4] Jens Huppelsberg, Kerstin Walter: Short textbook physiology . Georg Thieme, Stuttgart / New York, ISBN 3-13-136432-7 .