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<p>The human hippocampus exhibits distinct genetic, cellular, and connectivity profiles along its anterior–posterior long-axis, resulting in a differential sensitivity to visuospatial information. Long-axis development, therefore, may contribute to developmental increases in visuospatial memory capacity. To test this, we developed and applied a precision functional mapping technique to identify functional systems in the hippocampus of single subjects using BOLD-fMRI (<i>N</i> = 471, aged 5–21). We discovered considerable developmental remodeling of the hippocampal long-axis, particularly for the posterior functional system. With age, surface-area (mm<sup>2</sup>) of the posterior system decreased by 39.4%, while BOLD activity became increasingly independent and showed a sharper topographic boundary with the rest of the hippocampus. Notably, the posterior system showed strong preferential connectivity with medial-parietal regions which correlated with both age and age-adjusted memory scores. These results indicate the hippocampal long-axis becomes topographically and functionally specialized with development, potentially contributing to developmental increases in memory capacity.</p>

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The hippocampus becomes topographically and functionally specialized along the longitudinal axis with development

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年6月18日

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  • Jonah Kember,
  • Ying He,
  • Zeus Gracia-Tabuenca,
  • Alexander Barnett,
  • Xiaoqian J. Chai

摘要

The human hippocampus exhibits distinct genetic, cellular, and connectivity profiles along its anterior–posterior long-axis, resulting in a differential sensitivity to visuospatial information. Long-axis development, therefore, may contribute to developmental increases in visuospatial memory capacity. To test this, we developed and applied a precision functional mapping technique to identify functional systems in the hippocampus of single subjects using BOLD-fMRI (N = 471, aged 5–21). We discovered considerable developmental remodeling of the hippocampal long-axis, particularly for the posterior functional system. With age, surface-area (mm2) of the posterior system decreased by 39.4%, while BOLD activity became increasingly independent and showed a sharper topographic boundary with the rest of the hippocampus. Notably, the posterior system showed strong preferential connectivity with medial-parietal regions which correlated with both age and age-adjusted memory scores. These results indicate the hippocampal long-axis becomes topographically and functionally specialized with development, potentially contributing to developmental increases in memory capacity.