Accession Number : ADP006084

Title :   The Interaction of Thalamo-Cortical Systems in the 40 Hz Following Response,

Corporate Author : SIMON FRASER UNIV BURNABY (BRITISH COLUMBIA)

Personal Author(s) : Weinberg, H. ; Cheyne, D. ; Brickett, P. ; Gordon, R. ; Harrop, R.

Report Date : FEB 1988

Pagination or Media Count : 6

Abstract : Galambos, Makeig and Talmachoff (1981) described what they called the 40 Hz response. This steady-state response was a sinusoidal EEG following response to repetitive auditory stimulation which was of maximal amplitude at rates between 35 to 45 Hz. Galambos suggested that the response was a superimposition of brain-stem responses (waves iv and v) and thalamic mid-latency responses. Assuming there is volume conduction of these responses, the widespread distribution of the 40 Hz response is consistent with the interpretation of the sources being primarily of thalamic or brainstem origin. Spydell, et al. (1985) measured the latencies of wave V of the auditory brain-stem response assuming they should should be different in normals and patients with brain-stem lesions. He came to the conclusion that there were independent generators. He also observed that in a group of patients with unilateral temporal lobe lesions the 40 Hz response appeared unimpaired. He concluded from this that temporal lobe was not involved in the response. Weinberg, et al. (in press) reported a study in which both electrical and magnetic recordings were obtained from two healthy right-handed subjects with normal hearing. (js)

Descriptors :   *HEARING, AMPLITUDE, CONDUCTIVITY, ELECTRICAL PROPERTIES, GENERATORS, MAGNETIC FIELDS, PATIENTS, RATES, RECORDING SYSTEMS, RESPONSE, STEADY STATE, STIMULATION(PHYSIOLOGY), VOLUME.

Subject Categories : Psychology
      Medicine and Medical Research

Distribution Statement : APPROVED FOR PUBLIC RELEASE