Sonar beam animations for:

“Adaptive Behavior for Texture Discrimination by the Free-flying Big Brown Bat, Eptesicus fuscus”
Ben Falk, Tameeka Williams, Murat Aytekin, Cynthia F. Moss
[link]


Description

Video animation of trial presented in Fig. 5a. Video and sound data were slowed down by a factor of 10. The upper-right panel shows the high-speed video recording from each trial. The upper-left panel shows a top-down view of the flight room (note: view rotated in relation to Fig. 5 to match the high-speed video view). The smooth object (S+) is displayed as a white circle, and the textured S- is displayed as a red square. The bat is shown in brown (note: cartoon head aim not corrected for the direction of the sonar beam but instead shows the direction of flight path). The flight path is shown in blue and the vocalization beam directions are indicated by black lines for the first pass and gray lines for the second pass. In this trial, the bat first inspects S- and then immediately goes on to hit S+, as indicated by the beam directions calculated by the 16 microphone array. There is a decrease in the durations of the vocalizations and the pulse interval between vocalizations leading up the inspection of S-. The last vocalization of inspection of S- was highlighted in pink. Before the bat passes S-, the bat makes a vocalization beyond S- (beam directions have been scaled to the minimum overlap zone), indicating a shifting of gaze beyond S- (green). During the final approach and hit of S+, the bat decreases pulse interval and duration of its vocalizations and locks its beam direction to the target (yellow).

Video animation of trial presented in Fig. 5b. In this trial, the bat begins with an inspection of S-. The bat makes a loop around the room and ultimately hits S+. The second pass around the targets is indicated in gray. Note the decrease in pulse interval and duration as the bat inspects the targets and also when it hits S+.

Video animation of trial presented in Fig. 5c. This trial is similar to SM1 in that the bat first inspects S- and then immediately hits S+. There is a decrease in pulse interval and slight decrease in duration as the bat inspects S-.

Video animation of trial presented in Fig. 5d. In this trial, the bat makes two passes at the objects. In the first pass, the bat inspects S- and then it flies beneath it. In the second pass, the bat inspects S+ before ultimately hitting S+. Due to the close spacing between S+ and S- in this trial, we were unable to determine if the bat inspected each object sequentially or if it inspected both objects at the same time.







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