Cortical origin of middle-latency auditory evoked responses in man.
We have recorded middle-latency magnetic evoked responses to 50-ms noise bursts, presented once every 0.9 s, over the right hemisphere of healthy humans. The measurements were carried out with a sensitive 7-channel SQUID gradiometer with a passband of 0.5-2000 Hz. The response consisted of peaks at about 30, 50 and 65 ms. The location of the equivalent source of the 30-ms deflection agrees with activation of the supratemporal auditory cortex, slightly anterior to the source area of the well-known 100-ms deflection.
Low Temperature Laboratory, Helsinki University of Technology, Espoo, Finland.
M
M
Pelizzone
R
R
Hari
J P
JP
Mäkelä
J
J
Huttunen
S
S
Ahlfors
M
M
Hämäläinen
D000161:Acoustic Stimulation; D000328:Adult; D001303:Auditory Cortex / Q000502:physiology*; D005072:Evoked Potentials, Auditory; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged