Functionally-distinct pyramidal cell subpopulations during gamma oscillations in mouse hippocampal area CA3

•Functional network dynamics in hippocampus are important for cognition.•They depend on synchronized electrical activity of inhibitory and excitatory neurons.•Excitatory pyramidal neurons were thought to be a homogeneous cell class.•We show evidence of 3 distinct pyramidal cell populations.•These populations show functional differences during network rhythms.