Frühe akustisch evozierte Potentiale, ausgelöst durch einen sinusförmigen Reiz

Abstract

Within the first 10 ms after a sine-shaped sound wave (tone pip) seven small-amplitude potentials can be recorded in persons with normal hearing and normal brainstem functions. These components, in the nanovolt range, correspond to the electrical activity of various pathways of the auditory tract. In accordance with this view the resulting potentials were assigned to the following structures in the region of the periphery and the brainstem: component I corresponds to the cochlea or acoustic nerve (receptor, II to the cochlear nucleus (medulla), III to the upper olive (caudal pons), IV to the lateral lemniscus (rostral pons), V to the inferior colliculus (midbrain), VI to the medial geniculate body (diencephalon), VII to the acoustic radiation (cortex). Clinically well defined lesions of the acoustic nerve and brainstem indicate that there is a close topographical relationship between the clinical localisation and absence or delay of the individual components.

Akustisch evozierte Potentiale bei der Multiplen Sklerose

“…1977 erschienen Veroffentlichungen grOIere Fallzahlen (Stockard et al, 1977;Chiappa et al, 1977). Aus der eigenen Klinik existieren zunächst Einzelbeschreibungen (Maurer et al, 1979 Abb. 1 Doppeltlogarithmische Darstellung der postsynaptischen Anteile der akustisch evozierten Potentiale mit den frOhen, mittleren und spaten Anteilen.…”

Akustische Kurzzeitreize für die Ableitung von Hirnstammpotentialen durch rechnergesteuerte Systemanalyse

“…Whereas the curves of the acoustic pressures largely deviate from those of the electrical stimuli, as shown by measurements in the artificial auditory canal (the deviations depending on the headphones used in each case), the transmission properties of the electro-acoustic transducers are processed mathematically on the basis of Fourier's transformation, and such processing makes it possible to electrically produce any desired sequences of acoustic stimuli, taking the transmission properties of the headphones into account. In this manner, synchronous discharging of the sensory cells by brief acoustic stimuli, which is required for EAEP recording, can be und impulsartig sein soil, ist demnach nicht erfüllt (4,5,8,9)…”