Clinical section
Late auditory evoked potentials can occur without brain stem potentialsLes potentiels évoqués auditifs tardifs peuvent apparaître sans potentiels de tronc cérébral

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Abstract

The sequence of early, middle and late auditory evoked potentials is well known. However, it is unknown whether the late (60–250 msec) potentials can occur independently of the early, brain stem potentials. Therefore, in 6 subjects with markedly abnormal or absent brain stem potentials, we recorded two of the late potentials: the vertex potential and the T-complex. The latter is a putative product of auditory cortex. Both of these potentials were clearly evident in all patients in spite of the absence of or marked abnormalities in brain stem potentials.

Résumé

La séquence de potentiels auditifs, précoces, moyens et tardifs est bien connue. Toutefois, nous ne savons pas si les potentiels tardifs (60–250 msec) peuvent se produire indépendamment des potentiels précoces, du tronc cérébral. Nous avons donc enregistré chez 6 sujets présentant des potentiels de tronc absents ou fortement anormaux, deux des potentiels tardifs, le potentiel au vertex et le complexe T. Ce dernier est supposé produit par le cortex auditif. Ces deux potentiels étaient clairement présents chez tous les patients en dépit de l'absence ou des anomalies importantes de leurs potentiels de tronc.

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    This study was made possible by The Robert W. Graves Memorial Fund.

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