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Fig. 1. Experimental setup and methods. (A) A semi-schematic representation of the ELL slice. Stim1 represents the molecular layer stimulus and Stim2 the trans-ELL field stimulation. The dotted line represents the alignment of successive recording sites. EGp, Eminentia Granularis posterior; Mz, dorsal zone, Dlz, dorsolateral zone and Vlz, ventrolateral zone of ELL. (B) Series of field potential recordings in response to molecular layer stimulation (Stim1), made at successive sites through the layers of ELL as indicated by the dotted line in A, starting from the deep granular cell layer (distance 0 mm) to the outer molecular layer (distance 750 mm). See also Fig. 2 for an explanation of cell layers. (C) Enlargement of selected traces (Vb, V0, Va) from B, to illustrate how current source densities (CSD) are calculated. See Equation 3 in text.





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