Original Papers: Travaux originaux: Early Auditory-Evoked Responses: Spectral Content

Abstract

Spectral analysis of the early auditory-evoked responses in man and in the cat has shown that the predominant contribution to the total power is contained in the band below 50-100 Hz. This low-frequency content is considerably reduced when the corresponding spontaneous brain activity spectrum is subtracted from the response spectrum. Under the latter circumstances, the dominant frequency contribution is found in the 500- to 2 500-Hz bandwidth.

L'analyse spectrale des réponses du tronc cérébral de l'homme et du chat a montré que la plus grande énergie se trouvait au-dessous de 50-100 Hz. Cette bande d'énergie devient moins importante si on soustrait le spectre de l'EEG spontané du spectre des réponses; les fréquences dominantes se trouvent alors dans la bande de 500-2 500 Hz.

Key Words:

• Auditory-evoked response
• Early components
• Spectral analysis
• Cat
• Man