Fig. 7. Quantification of dendritic parameters of adult pyramidal neurons of layers II/III, V and VI from active (white bars) and activity-deprived (hatched bars) OTC. Neither length nor segments numbers of apical and basal dendrites differed significantly. By contrast, spine density was significantly increased on apical and basal dendrites of pyramidal cells from layers II/III and VI. **=P<0.01; ***=P<0.001. The numbers in the bars represent the number of dendrites analyzed. For apical dendrites, they equal the number of neurons analyzed.