SUMMARY
The blocking effect of sensory arousal and of active attention on epileptic seizures is studied in 200 cases of petit‐mal and 20 cases of grand mal with focal onset. The mechanisms of the seizure block may be similar to desynchronization and reciprocal inhibition of neuronal activity in the cortex during arousal. They may arise from the non‐specific thalamo‐reticular system which is activated by sensory afferents or attention.
RÉSUMÉ
L'effet du blocage d'une excitation sensorielle et de l'attention active dans des crises épileptiques a été observé en 200 cas de petit mal et 20 cas de grand mal ayant eu un début focal. Les mécanismes du blocage pendant la crise peuvent être semblables à une désynchronisation et à une inhibition réciproque de l'activité neuronale dans le cortex durant l'excitation. lis peuvent provenir du système thalamo‐réticulaire non spécifique qui est activé par des afférents sensoriels ou par l'attention.
Slow brain potentials were averaged from 12–15 EEG records (t = DC or 5 s) before and during voluntary hand movement and writing, spatial vision, language, and calculation tasks without vocalization and with visual fixation. EOG and writing pressure or EMG were recorded simultaneously. Skilled actions caused largest negative potentials in the contralateral sensorimotor hand area. Left-sided lateralization or bilaterally equal surface-negative potential shifts appeared during language and calculation tasks in 90% of the right-handers and in 75% of the left-handers. Right-sided lateralizations occurred during the viewing of perspective Necker figures or random-dot stereograms in the large majority of all subjects.
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