Figure 11. Range of peak amplitudes of Ca²⁺ transients in the different subcellular compartments of layer 2/3 pyramidal cells.

A, distribution of peak amplitudes of Ca²⁺ transients evoked by single APs recorded in boutons. Continuous line represents a Gaussian fit (1.2 ± 1.0). B, distribution of AP-evoked peak amplitudes in spines of basal dendrites. Continuous line represents a Gaussian fit (0.6 ± 0.3). C, range of Ca²⁺ transients evoked by a single AP in the shaft of the proximal apical dendrite (Apical), in the shaft of basal dendrites (Basal), in spines of basal dendrites (Spine), in the main axon (Axon), in axon collateral segments in between boutons (Coll) and in boutons. • indicate the average amplitude with error bars ± 1 s.d. and the range of amplitudes.