Figure 1.

Main features of SD. (a) Simultaneous extra (V_o) and intracellular recording (V_i) in the main apical dendritic shaft of a pyramidal cell in the CA1 region, and the transmembrane potential (V_m). Note the balanced drift of V_i and V_o. Modified from Canals et al.⁵⁰ (b) Spatiotemporal display of the negative ΔV_o and [K⁺]_o along the CA1 strata. Note the strata-specific stereotypic changes and the continuous reduction of [K⁺]_o from the initial peak. SD is always shorter in the basal dendritic tree. The late phase occupies a narrow band in the apical dendrites. Reproduced from Herreras and Somjen.²¹