Figure 1. Alignment between hippocampal subspaces for memory processes (IMAGE)
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A. Overview of hippocampal dynamics during movie watching. FMRI data from the hippocampus were measured at the voxel level, and low-dimensional subspaces for two types of novelty and memorability were extracted. From the same hippocampal dynamics, three subspaces were derived: one for co-occurrence novelty encoding, one for valence novelty encoding, and one for memory formation.
B. Degree of alignment between the subspaces. The analysis demonstrated that the novelty subspaces were aligned with the memory formation subspace but not with the memory retrieval subspace. Statistical testing was performed by generating 1,000 random subspaces through data shuffling (gray dots) and comparing their alignment scores with those of the observed subspaces (red and purple dots).
C. Relationship between subspace alignment and memory performance. Each point represents data from an individual participant, showing that greater alignment between the novelty encoding subspaces and the memory formation subspace is associated with higher memory performance scores for the movie content.
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