Episodic Memory Signals in the Rat Hippocampus

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Episodic Memory Signals in the Rat Hippocampus Wendy A Suzuki Neuron Volume 40, Issue 6, Pages 1055-1056 (December 2003) DOI: 10.1016/S0896-6273(03)00806-7

Figure 1 Neurophysiological Correlates of an Episode Schematic representation of the three major patterns of activity observed on the + maze alternation task. Colored grids in (A)–(C) show the location of high activity on the + maze. Note that the activity for the four journey types are shown separately for the two start arms (north and south) and two goals arms (east and west) of the maze. (A) Example of journey-dependent retrospective pattern of activity. This cell responded in the west goal arm only on north-west journeys and not on south-west journeys. Thus, this cell signaled retrospective information about where the journey started. (B) Classic place cell activity. This cell responded in exactly the same place on the east arm, irrespective of where the journey started (journey-independent firing). (C) This cell provides a journey-dependent prospective signal, since it only responds in the start arm on north-east journeys but not on north-west journeys. In this way, networks of hippocampal cells convey information about the recent past (A), present (B), and imminent future (C). Neuron 2003 40, 1055-1056DOI: (10.1016/S0896-6273(03)00806-7)