Fig. 2: Neural representations for post-sleep remembered items within pre-sleep learning and post-sleep mental retrieval sessions, respectively.
From: Slow-wave sleep and REM sleep differentially contribute to memory representational transformation

A Within-item (WI), within-category (WC), and between-category (BC) similarities during pre-sleep learning for post-sleep remembered items. B and C Significant item-level representations and category-level representations were identified for post-sleep remembered items in the clusters. D WI, WC, and BC similarities during post-sleep mental retrieval for post-sleep remembered items. E and F No significant item-level representations, but significant category-level representations were identified for post-sleep remembered items in the cluster. Significant clusters with pcluster < 0.05 were circled by black lines. Z(ρ): Fisher Z-transformed Spearman’s correlation coefficient.