We mapped local excitatory pathways in each area (primary motor cortex (vM1), primary somatosensory cortex (vS1;
barrel cortex), and secondary somatosensory cortex (S2)) across all cortical layers using glutamate uncaging and laser scanning photostimulation.
We analyzed these maps to derive laminar connectivity matrices describing the average strengths of pathways between individual neurons in
different layers and between entire cortical layers. ..."
Hooks BM, Hires SA, Zhang YX, Huber D, Petreanu L, Svoboda K, Shepherd GM (2011) Laminar analysis of excitatory local circuits in vibrissal motor and sensory cortical areas. PLoS Biol 9:e1000572 [PubMed]