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. Author manuscript; available in PMC: 2019 Jan 24.
Published in final edited form as: Curr Opin Behav Sci. 2017 Sep 13;17:169–177. doi: 10.1016/j.cobeha.2017.08.005

Figure 1. Posterior medial network activity patterns represent structured temporal sequences.

Figure 1

(A) Experimental task from Hsieh and Ranganath[35]: Participants were scanned while processing a continuous stream of five-object sequences. Boxed items are “within-sequence” (orange box) and “between-sequence” (blue box), respectively. (B) Voxel pattern similarity for repetitions of the same object in learned sequence (green bars) and for trials that shared either the same position (blue) or same object in random sequences (red). Values are shown for regions within the posterior medial (PM) network [37], including parahippocampal cortex (PHC), retrosplenial cortex (RSC), angular gyrus (Ang. gyrus), and ventromedial prefrontal cortex (VMPFC). (C-F) PM network activity patterns at boundaries between sequences (Frank Hsieh and Charan Ranganath, unpublished data): Activity patterns were more similar between adjacent items in the same sequence (“within-sequence” pairs, orange bars) than between adjacent items in different sequences (“between sequence” pairs, blue bars). (C) Parahippocampal cortex. (D) Retrosplenial cortex. (E) Angular gyrus. (F) Ventromedial prefrontal cortex.