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. Author manuscript; available in PMC: 2012 Dec 8.
Published in final edited form as: Neuron. 2011 Dec 8;72(5):847–858. doi: 10.1016/j.neuron.2011.09.029

Figure 1. Laminar patterns of auditory responses of LFP, CSD and MUA in the auditory cortex.

Figure 1

Responses to the BF tone in one example A1 site. Line plots (A) show LFP responses recorded at 23 depths using a linear array multielectrode with 100 μm intercontact spacing (schematic on left). In center (B) is the color plots of the laminar LFP profile shown in A; with negative deflection colored red and positive deflections colored blue. (C) depicts the CSD profile derived by the second derivative approximation of the field potential profile in A and B; red depicts extracellular current sinks (associated with net local inward transmembrane current flow) and blue depicts extracellular current sources (associated with net local outward transmembrane current flow). Selected MUA responses from channels 2, 6, 10, 15, and 19 are superimposed on the CSD plot. Vertical thin lines in all columns indicate stimulus onset. In this example, the peak of MUA at channel 15 corresponded to the peak negativity of LFP and current sink (CSD) at the response onset in Layer 4, and the responses from this location were used for analyzing lateral spread of signals. The asterisk indicates a superficial sink that produced N50.