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Different ChRs evoke distinct cortical activity profiles in vivo. A, Example traces of cortical LFP activity in response to 1.5 s of 10 mW/mm2 light stimulation of ChR2-expressing pyramidal neurons (upper). Average changes in spectral power density at this site across stimulation trials (lower). B, Same as in A, for Chronos. C, Same as in A, for Chrimson.
