Fig. 2.

Effects of focal chemical stimulation of the HDB on blood flow in the olfactory bulb ipsilateral to the stimulation. a Diagram of the experiment demonstrating the measurement of cerebral blood flow using a laser speckle contrast imager, and microinjection needle in the HDB. b The HDB area is indicated by the shaded portion. c, d Sample recordings of the olfactory blood flow and mean arterial pressure following a microinjection of l-glutamate (c 50 nmol in 50 nl, d 100 nmol in 100 nl) into the HDB in one rat. e Summary of responses (n = 8). Each point and vertical bar represents a mean ± SEM. Slight changes in the olfactory blood flow and mean arterial pressure were not statistically significant