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Placement of and response from laser Doppler flowmetry probes to 16 s whisker stimulation. a, Activation map showing regions of increased and decreased blood volume which provided targets for the placement of 16-channel electrode and LDF probe. b, Image showing electrodes inserted in, and LDF probes over the regions of increased and decreased Hbt. c, Cerebral blood flow responses from the LDF probe placed over the posHbt and negHbt regions (error bars, SEM).
