PubMed · 11004116
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C L Ludlow. 2000. Stuttering: dysfunction in a complex and dynamic system.. https://doi.org/10.1093/brain%2F123.10.1983
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We recorded auditory evoked magnetic fields (AEFs) by presenting pure tone bursts once every 4000 ms in 11 patients with a brain lesion in or in the vicinity of the auditory cortex. AEFs on the damaged side revealed several enhanced deflections in late-latency AEFs (slow AEFs), peaking at approximately 320 (DI), 1030 (D2) and 1600 (D3) ms post-stimulus in eight patients. All the dipoles of slow AEFs were concentrated in the superior temporal regions which were not involved by brain lesions. D1, D2 and D3 dipoles were uniformly upward, downward and upward, respectively. The dipole moment varied from 12 to 122 nAm and had no consistent relationship with latency. This is the first report describing slow AEFs in cases with temporal lobe lesions.
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An essential feature of the human brain is the ability to extract information from temporally distributed events in the auditory environment. We addressed this temporal encoding ability by modelling how stimulus rate is represented in the auditory cortex. We propose that a cortical representation of stimulus rate can be achieved through the oscillatory properties of nerve cells. Using non-invasive brain measures, we tested the prediction of the model that multiple rebound responses (RRs) occur after the ending of stimulation. MEG recordings revealed successive RRs which originated in the same areas as the N1s elicited by the auditory stimuli at latencies predicted by the model. Our modelling and experimental results therefore provide evidence that the temporal structure of the auditory environment is decomposed in human auditory cortex by cells performing bandpass filtering on periodic input.