Current source-density analysis of intracortical circuit in the granular retrosplenial cortex of rats: a possible role in stimulus time buffering.

•Layer 1a stimulation first evoked synaptic current sinks in layer 1 and then layers 2–4.•WM stimulation induced synaptic long latency current sinks in layers 2–4 and 6.•Thalamic inputs might be transmitted to layer 5, delayed by LS neurons in layers 2 and 3.•GRS integrates time-delayed thalamic inputs with direct inputs from other brain regions.