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Effects of photoperiodic manipulations on the density (numbers/mm2) of PNN (A), PV-positive cells (B) and PV cells surrounded by PNN (C), on the percentage of PV interneurons surrounded by PNN (D) or of PNN that surrounded PV cells (E), and finally on the chrondroitin sulfate (CS) immunostaining intensity (F) in telencephalic auditory brain regions of male starlings. Data were analyzed by Kruskal Wallis non parametric ANOVA followed when significant by post hoc tests. *= p<0.05.
