Supplemental materials included in the paper “An experimental method for evoking and characterizing dynamic color patterning of cuttlefish during prey capture” (in prep):
Movement phases of the robotic prey:
Natural: Skewer arm rotates clockwise into the water until it is fully submerged and approximately perpendicular to the surface of the water (“90 deg down”), pauses, then “wiggles” 3 times. A single “wiggle” consists of moving 10 deg clockwise (CW), then 10 deg counter-clockwise (CCW), then 10 deg CW again; or 10 deg CCW, then 10 deg CW, then 10 deg CCW again. In between each wiggle, the skewer arm paused for 3 seconds. After 3 wiggles, the skewer arm is moved back out of the water to the “start position.”
Smooth: Skewer arm enters the water and travels smoothly through one full rotation back up to the start position. Each food offering alternates between CW and CCW rotations.
Predictable: Skewer arm begins to enter the water along a smooth CW or CCW rotation. If the skewer reaches “90 deg down” and pauses, the skewer exits the water back in the direction from which it came. If the skewer enters the water and does not pause, the skewer continues in the same direction to exit the water. The “robotic prey” was designed to randomly choose whether or not to pause during each trial of this stage.