By using a dedicated 24-channel temporal lobe array and surface based laminar depth analysis, we revealed the tonotopic representations in the human primary auditory cortex on a 3T MRI system. We found that, compared to deep and superficial layers, the minimal inter-subject variability of the tonotopic representation and frequency tuning width were found at the middle layer. Locations in the auditory cortex with finer frequency tuning had smaller inter-subject variability. Taken together, our findings suggested that middle layer of the auditory cortex has more specific frequency preference and selectivity, consistent with neurophysiological animal studies.
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