Fig. 5.

Hierarchical context-dependent control of CS–US. A If the test context is identical to the extinction one, then the gate between CS and US connects to inhibit the US representation, otherwise the inhibitory connection does not work (e.g., ABA). This gating mechanism represents “hierarchical control” driven by Hippocampus. B A context-independent (hippocampal-independent) type of inhibitory connection is established during the extinction. C The context-dependent hierarchical controller has been removed by hippocampal lesion