Data for: Dynamical phase transition in spike neuronal firing patterns of hippocampal cells

To determine the dynamical state of the neurons, we have focused on the statistics of the distributions of inter-spike intervals. In particular, we identify two states. The first is the basal state, in which cell spiking follows non-correlated (memory-less) random statistics, usually with a Poisson-like distribution of intervals. The second state is obtained by the activation of the phospholipase C (PLC) signaling cascade with oxotremorine-M (Oxo-M), a M1 receptor agonist, which introduces temporal correlations in the spiking intervals. We interpret these correlations as a shift of the neuronal dynamics towards a critical state. We corroborate that this shift in dynamics is due to a change in the M-channel by applying the specific channel blocker XE991, as well as by blocking the phospholipase C (PLC) with U73122.