Giraud AL, Poeppel D.
Nat Neurosci. 2012 15(4):511-7. doi: 10.1038/nn.3063.
And on a similarly low-level topic: It has become commonplace to argue that as one ascends the auditory hierarchy, and especially as one goes from core to belt and parabelt areas, sensitivity to broadband (and complex) sounds increases. Tones and narrow-band sounds principally excite core fields, on this view. In a pair of studies using fMRI and MEG, we crossed bandwidth and modulation frequency. We find that bandwidth (while crucial at the inferior colliculus) doesn't play as central a role as modulation rate. Both studies converge in a striking way, showing that auditory cortex is exquisitely sensitive to low modulation rates, and precisely in the range that forms the basis for spoken language processing (i.e. great below ~16Hz, best below 8 Hz). We are interested in figuring out how our findings reconcile with the single-unit data providing a very different perspective (at least with regard to spectral sensitivity).
Sensitivity to Temporal Modulation Rate and Spectral Bandwidth in the Human Auditory System: MEG Evidence.
Wang Y, Ding N, Ahmar N, Xiang J, Poeppel D, Simon JZ.J Neurophysiol. 2011
Sensitivity to temporal modulation rate and spectral bandwidth in the human auditory system: fMRI evidence.
Overath T, Zhang Y, Sanes DH, Poeppel D.J Neurophysiol. 2012