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Comparison of laminar current source density (CSD) profiles across the depth of cortex between early in the recording session (first 25 stimulus presentations; left) and late in the session (last 25 stimulus presentations; middle), averaged across all sessions. The dashed line denotes the boundary of layer 4/5 (L4/5). Subtraction (right) suggests that there was little movement in the positioning of the linear microelectrode array throughout the session.
