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. Author manuscript; available in PMC: 2012 Sep 15.
Published in final edited form as: Neuroscience. 2011 Jun 2;191:148–158. doi: 10.1016/j.neuroscience.2011.05.045

Figure 4. Density and size of thin and mushroom spines in young and aged surgically-intact Rhesus monkeys and their correlation with the speed of DNMS acquisition.

Figure 4

A. The density of thin spines, but not of mushroom spines, is decreased in the dlPFC of aged monkeys. B. Thin spines in the aged NHP dlPFC are larger on average than those in young monkeys. C. The mean volume of thin spines is highly correlated with the number of trials required to learn the DNMS task in both aged and young monkeys. (adapted from Dumitriu et al., 2010)