The neural code for interaural time difference in human auditory cortex.
A magnetoencephalography study was conducted to reveal the neural code of interaural time difference (ITD) in the human cortex. Widely used crosscorrelator models predict that the code consists of narrow receptive fields distributed to all ITDs. The present findings are, however, more in line with a neural code formed by two opponent neural populations: one tuned to the left and the other to the right hemifield. The results are consistent with models of ITD extraction in the auditory brainstem of small mammals and, therefore, suggest that similar computational principles underlie human sound source localization.
Salminen
Nelli H
NH
Department of Biomedical Engineering and Computational Science, Helsinki University of Technology, PO Box 2200, FI-02015 TKK, Finland. nelli.salminen@tkk.fi
Tiitinen
Hannu
H
Yrttiaho
Santeri
S
May
Patrick J C
PJ
D000161:Acoustic Stimulation; D000328:Adult; D001303:Auditory Cortex / Q000502:physiology*; D001307:Auditory Perception / Q000502:physiology*; D004423:Ear; D005072:Evoked Potentials, Auditory; D005260:Female; D007839:Functional Laterality; D006257:Head; D006801:Humans; D015225:Magnetoencephalography; D008297:Male; D008959:Models, Neurological; D010775:Photic Stimulation; D013997:Time Factors; D014796:Visual Perception / Q000502:physiology