Figure 10. Location of [Ca²⁺]_i changes during slow afterhyperpolarizations.

A, image of a fura-2-filled CA1 cell indicating regions of interest for single wavelength (380 nm) fluorescence measurements during action potential-evoked AHPs. B, current clamp recordings of the sAHP following 1, 3, 5 or 7 action potentials evoked by brief (2 ms) current injections at a frequency of 67 Hz (inset shows 5 spike train). C 1, corresponding fluorescence measurements from the soma region on the same time scale as B. C 2, dendritic region fluorescence measurements for the 3 and 7 spike trains. Scale bar applies to C 1 and C 2.