Here the bat flies towards the center of the room (from the bottom of the frame, to the center). A prey item is dropped into the room and the bat turns to chase and catch it.
The bat makes a sharp U-turn inorder to intercept a target moving in a small circle
Head aim animation
Note: The bat vocalizations at the start of this trial are faint because of the relative placement of the bat and microphone. Once the bat has turned its head towards the target (and towards the microphone) the sounds become louder. Head aim data is not available at the start of the trial as the bat's head is facing away from the sonar beam recording array.
The bat makes an attempt to catch a target moving in a small circle, it completes a full 360 degree turn hot on the tail of the target but fails to match up with the target and aborts the mission.
Head aim animation
Note: Head aim data is not available during the middle of the trial when the bat's head is facing away from the sonar beam recording array.
The bat fails in its first attempt to catch the target, and makes a sharp U-turn to come back and catch it the second time.
Click here to see an animation of a bat chasing a target, along with the representation of the pursuit in the normal development space.
The left panel shows the top view. Middle panel shows side view (x axis and height). Right panel shows the k1-k2 plane (normal development). The blue trace is the bat, the black trace is the target (a tethered insect). The bat initially flies in a relatively straight path. In the k1-k2 plane this part of the bat's trajectory is near the origin (low curvature). As the bat detects the insect it changes its flight path and begins to turn into the insect. This causes the curvature of its flight to increase, leading to its trajectory in the k1-k2 plane moving out from the origin. The bat turns sharply, but can not catch the target. It aborts its pursuit and straightens out. In the k1-k2 plane this is seen in the return on the bat's trajectory to the origin. The tethered insect follows an oval shaped trajectory in physical space. This is reflected in the k1-k2 space, where it moves closer and further from the origin, indicating changing curvature of its path.
Correct interception : A trial in which the bat anticipated the target location on the right. One can see that the bat scans to the left, finds the cue, and orients directly to the target on the right.
Miss : A catch trial in which the bat did not attend to the correct target position. In this case, the bat scanned the cue but oriented to the left, missing the target.