Fig. 2. Experimental apparatus used to study the response of scalloped hammerhead and sandbar sharks to prey-simulating dipole electric fields. One of the four electrode pairs (circles on the acrylic plate) was activated with a weak electric current, which generated a dipole electric field around the electrodes. The response of the sharks was recorded with a video camera mounted onto the end of a sliding track and positioned directly above the center of the electrode array.

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