Fig. 2.

Comparison of in-network firing patterns with two characterizations of intrinsic rhythmicity derived from recordings made in synaptic isolation. An intrinsic burstiness metric produces a broad unimodal distribution (Aiii) that is uncorrelated with the first principle component decomposition of in-network firing behavior (Aii) and only weakly related to manual categorization of control activity (Ai; *P < 0.05 for nonrespiratory vs. inspiratory). Manual score of intrinsic behavior also produces a unimodal distribution (Biii) that is not clearly related to in-network behavior as defined by manual classification (Bi) or principal component analysis (PCA; Bii). Non-resp., nonrespiratory; Insp., inspiratory; Exp., expiratory; Post-Insp., postinspiratory; a.u., arbitrary units.