Figure 1.

Airflow stimulus calibration. In all subplots, the origin (0, 0) represents the location of the airflow source, the coordinate (0, 22) is close to the center of the whisker array. All units are in centimeters. Red, blue, and black represent an airflow direction of 45°, 0°, and −45°, respectively. The saturation of the color represents the magnitude of the airspeed. Dark, medium, and light colors represent 5, 3, and 1 m/s, respectively. A–C, Each panel compares the measured airspeeds for the different directions, keeping supply pressure constant. The overlap at all positions and directions indicates that, for each pressure (intended airspeed), there is no bias in airspeed across directions. D–F, Each panel shows the measurements for a given direction across airspeeds. Although airspeed is not constant across all positions in the array, the airspeeds at each position within the array are distinct across pressures. Therefore, comparisons across pressure are equivalent to comparisons across airspeed.