Sustained fields of tones and glides reflect tonotopy of the auditory cortex.
Cortical activation in response to two types of auditory stimuli, constant-frequency tones and frequency glides, was studied by measuring the magnetic field outside the head using a whole-head 122-channel magnetometer. Both the magnetic N1m and sustained responses were located in the supratemporal plane of the primary auditory cortex. The sustained responses both to constant-frequency tones and frequency glides reflect tonotopic organization of the auditory cortex both in depth and direction, thus revealing the underlying neuroanatomical structure of the auditory cortex.
Huotilainen
M
M
Department of Psychology, University of Helsinki, Finland.
Tiitinen
H
H
Lavikainen
J
J
Ilmoniemi
R J
RJ
Pekkonen
E
E
Sinkkonen
J
J
Laine
P
P
Näätänen
R
R
D000161:Acoustic Stimulation; D000328:Adult; D001303:Auditory Cortex / Q000502:physiology*; D004585:Electrooculography; D007839:Functional Laterality / Q000502:physiology; D006801:Humans; D015225:Magnetoencephalography; D008297:Male