A model for the mechanism of generating the auditory evoked field.
The auditory evoked potentials and fields, recorded with electro- and magneto-encephalography, respectively, have the prominent peak at the latency of about 100 ms, named N100(m). The mechanism for generating the peak is not yet fully elucidated, however. Firstly, this study reviewed empirical results on the mechanism that had been previously published by the same author. The results showed that phases of the ongoing oscillations at around 6 Hz above the auditory cortex are locked with respect to onsets of the auditory stimuli during the period of N100 m, and also that powers of the oscillations are increased during the same period. Taking into account these results as well as another evidence that the peak arises from multiple sources within the auditory cortex, a model for the mechanism of generating the auditory N100 m was proposed. The model assumed several oscillators in the auditory cortex, whose phases were locked during the period of N100 m, but not locked at other periods. Computer simulation validated the model. The model could represent a starting point for further experiment and simulation.
Hamada
Takashi
T
AIST-Kansai, Ikeda, Osaka, 563-8577, Japan. hamada-takashi@aist.go.jp
D000161:Acoustic Stimulation / Q000379:methods; D001303:Auditory Cortex / Q000502:physiology*; D001931:Brain Mapping; D003198:Computer Simulation; D004569:Electroencephalography / Q000379:methods; D005072:Evoked Potentials, Auditory / Q000502:physiology*; D006801:Humans; D015225:Magnetoencephalography; D008954:Models, Biological