MC population responses evolve with repeated odorant sampling more than sTC populations. A, Example MC-cell body experiment, showing responsive cells during 1 and 5 Hz inhalation at different time points. Time progresses horizontally in 2-s increments that represent the response maps during odorant presentation, averaged over 1 s. A number of MC cell bodies change their response strength or response polarity during 5 Hz inhalation, with fewer changing during 1 Hz inhalation. Black arrows highlight cells whose response changes substantially or switches polarity during odor presentation. B, Example sTC cell body experiment, displayed as in A, showing a relative lack of changes in responses among individual cells, regardless of inhalation frequency. C, Average MC population response to an odorant at a given time point correlated to the population response at the first time point over the length of odorant presentation. Correlations decreased faster at higher frequencies, although this difference was not statistically significant. Left, All MC-cell body data. Middle, Data from GCaMP6f experiments. Right, Data from GCaMP6s experiments. D, Plot of same analysis for sTC responses. Temporal decorrelation does not vary substantially across inhalation frequencies among sTCs. Decorrelation values differed between MCs and sTCs (see text for details). In both C, D, shaded areas represent SEM.