A, example traces of PV IN firing properties elicited by current injection (upper) or light activation (lower). B, representative traces displaying activity evoked, at arrow, by a 10 ms light pulse after 4AP + EAA blockers wash‐on. Activity recorded in PYRs (upper) and INs (lower) was comparable. C, quantitative comparison of the amplitude, duration and AUC of light‐evoked and spontaneously occurring LLDs. Bars indicate the timing and duration of light pulses. Each symbol represents an individual cell. Error bars are the mean ± SEM. [Color figure can be viewed at wileyonlinelibrary.com]