Cholinergic Neuromodulation Changes Phase Response Curve Shape and Type in Cortical Pyramidal Neurons Stiefel, Klaus M. ; Gutkin, Boris S. ; Sejnowski, Terrence J. Abstract Publication: PLoS ONE Pub Date: December 2008 DOI: 10.1371/journal.pone.0003947 Bibcode: 2008PLoSO...3.3947S