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Scatter plots relating individual spatial learning index scores to levels of hippocampal SYN-IR in young and aged rats. Lower learning index scores, indicative of better learning, correlated with higher SYN-IR intensity values selectively in the dentate gyrus OML, MML, and CA3-LM. Regressionlinesand correlation coefficients refer to the relationship between individual differences in spatial learning and SYN-IR for the aged subjects alone.
