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. Author manuscript; available in PMC: 2015 Aug 15.
Published in final edited form as: Neuroimage. 2014 Apr 21;0:188–195. doi: 10.1016/j.neuroimage.2014.04.045

Figure 4.

Figure 4

Relationship between anatomy of auditory processing, current understanding of ECoG physiology, and our results. (A) Auditory pathways between the medial geniculate nucleus of the thalamus and primary auditory cortex. Thalamic neurons (i.e., thalamo-cortical (TC) and reticular (R) neurons) are shown in gray, auditory cortex (AC) neurons are shown in blue, and their interactions are shown in red. (B) Top: Exemplary illustration of typical power spectral density of ECoG signals. Activity in the alpha (8-12 Hz) band, indicated by the red band, reflects thalamocortical interactions. Activity in the gamma (70-110 Hz) band, indicated by the blue band, indexes activity of local populations of neurons. Bottom: Average time course of the first 120 sec of ECoG activity. The blue trace gives gamma activity — the red trace gives alpha activity. (C) Outline of areas with significant ISC values in the alpha and gamma ECoG amplitudes given by the results in Fig. 2. Taken together, our results are consistent with the hypothesis that auditory information reaches the cortex in areas close to auditory cortex, from where they are communicated to peri-sylvian and distinct frontal cortical locations (see illustrative yellow arrows).