Maximum Length Sequences - A Fast Method for Measuring Brain-Stem-Evoked Responses
- 1 January 1982
- journal article
- research article
- Published by Taylor & Francis in International Journal of Audiology
- Vol. 21 (3) , 242-250
- https://doi.org/10.3109/00206098209072742
Abstract
A technique is described which allows faster evaluation of brain-stem-evoked responses (BER) than the conventional method. It is based on a pseudorandom arrangement of the click stimuli in ‘maximum length sequences’ (MLS). In this way, the responses to each click stimulation can overlap with the responses to other clicks. A simple deconvolution of the averaged response to MLS leads to a click response pattern which is in good agreement with the responses obtained by conventional BER audiometry (BERA). Thus, the procedure for the assessment of BER can be accelerated by a factor of about 6. Repetition rates up to 856 Hz were tested. Even for high repetition rates, the main features of the BER are preserved, although the latency of wave V increases by as much as 1.3 ms. Nous décrivons une technique d'audiométrie par potentiels évoqués au niveau du tronc cérébral (BER), permettant d'obtenir les résultats beaucoup plus rapidement. La technique est basée sur un arrangement pseudo-aléatoire des stimuli (clics) en séquences de durée maximale, la réponse à chaque clic se superposant à la réponse précédente. Une simple déconvolution de la réponse moyenne aux séquences à durée maximale donne des résultats comparables aux résultats obtenus par la méthode conventionnelle, mais la méthode décrite est environ 6 fois plus rapide que la méthode conventionnelle. Měme avec des taux de répétition élevés (jusqu'à 856 Hz) et bien que la latence de l'onde V augmente de 1,3 ms, les caractéristiques principales des BER sont maintenues.Keywords
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