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. 2018 Oct 16;9:4162. doi: 10.1038/s41467-018-06569-4

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© The Author(s) 2018

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 4 — Right hippocampal volume correlates with both olfactory identification and spatial memory. a We measured hippocampal volumes using MAGeT-Brain. Within spatial learners, there was a positive correlation between right hippocampal volume and olfactory identification (left) (r = 0.32, Bootstrap BCa 95% CI [0.03, 0.60]), and a negative correlation between right hippocampal volume and average navigational learning errors (right) (r = −0.51, Bootstrap BCa 95% CI [−0.75, −0.20]). b Within response learners, right hippocampal volume did not significantly correlate with olfactory identification (left) (r = 0.08, Bootstrap BCa 95% CI [−0.32, 0.35]), nor with average navigational learning errors (right) (r = -0.03, Bootstrap BCa 95% CI [−0.42, 0.28]). These results indicate that the relationship between olfactory identification, navigation, and hippocampal volume is specific to those who use a hippocampal-dependent navigation strategy (spatial memory)