Figure 2. Comparison between canonical components and functional subspaces of the hippocampus (IMAGE)
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This figure illustrates the relationship between the hippocampus’s intrinsic components and its functional subspaces. Three components were obtained through principal component analysis (PCA) of hippocampal neural data collected while participants watched a movie and freely recalled its content (Center). Consistent with previous findings, the components exhibited spatial gradients along the hippocampus’s longitudinal axis. The first principal component was associated with the memory formation subspace (Left), while the third principal component was linked to the novelty encoding subspaces (Right). The novelty encoding subspaces were aligned with the memory formation subspace but not with the memory retrieval subspace. In contrast, the memory formation and retrieval subspaces were aligned. These findings demonstrate that the neural subspaces identified in this study reflect the hippocampus's intrinsic functional structure.
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