Fig. 1.

Schematic diagram of the experimental procedures. Regional blood flow in the olfactory bulb and frontal cortex were measured by laser Doppler flowmetry. Odor (5% amyl acetate (AA)] was applied by constant flow of humidified nitrogen into the nose using a custom-built odor delivery system. The flow passes through a tube inserted into the larynx. A tracheal tube was inserted caudally into the trachea, and respiration was artificially maintained using a respirator. Vehicle is 100% propylene glycol