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. 2020 Jun 22;11:3161. doi: 10.1038/s41467-020-16489-x

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© The Author(s) 2020

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. 7 — a Ongoing firing rate was lower in young vs. old pups (≤P13: n = 36; median = 0.59 Hz; mean ± s.e.m. = 1.59 ± 0.73 Hz; P16+: n = 113; median = 1.12; mean ± s.e.m. = 2.46 ± 0.29 Hz; difference of medians = 0.53 Hz; p = 0.004, Mann-Whitney rank sum test). Horizontal blue line is the median, horizontal black line is the mean. Error bars are s.e.m. b Probability histogram of ongoing firing rates (bins range from 0 to 30 in 2 Hz increments). c Percentage of significantly suprathreshold responsive neurons with developmental age. As previously described, significance for stimuli was analyzed when number of trials was ≥3. Sibling odor significant neurons (n = responsive:total neurons; P5–7 = 3:10 neurons, P8–10 = 2:9 neurons, P11–13 = 3:15 neurons, P16+ = 9:109 neurons). Non-sibling odor significant neurons (n = responsive:total neurons; P5–7 = 1:10 neurons, P8–10 = 1:9 neurons, P11–13 = 3:16 neurons, P16+ = 13:110 neurons). d Proportion of suprathreshold odor significant and odor non-significant neurons for sibling odors and non-sibling odors in sibling-preferring and sibling-avoiding age groups. ≤P13 (sibling odor: 8 significant, 26 non-significant; non-sibling odor: 5 significant, 30 non-significant), P16+ (sibling odor: 9 significant, 100 non-significant; non-sibling odor: 13 significant, 97 non-significant). Proportion of sibling odor-responsive neurons was different between age groups (≤P13 vs. P16+ sibling odor responsive; p = 0.029, Fisher’s exact test) and not different for proportion of non-sibling-responsive neurons (≤P13 vs. P16+ non-sibling odor responsive; p = 0.77, Fisher’s exact test). Colored bars represent proportion of significantly responsive sibling or non-sibling neurons. Gray areas indicate proportion of neurons which were not significantly responsive. All tests are two-tailed. For detailed statistical information, see Supplementary Table 1. *p < 0.05, **p < 0.01, ns not significant.