Movie S1 from Pair-bonding influences affective state in a monogamous fish species

Illustration of the judgment bias test (Experiment 2) Each female was trained to open boxes covered by a movable lid, and to discriminate between a positive (rewarded with one chironomid larva) and a negative (unrewarded) signal characterized by a randomly attributed combination of box position (on the left or right side of the tank) and lid colour (white or black). For instance, the female illustrated in this video learned that the positive signal was the box on the left side and covered with a black lid, and the negative signal was on the right side and covered with a white lid. Her mood was assessed as the response to an ambiguous signal placed in a middle position between the two learned signals and covered with grey lid. Given the length of the trial, the speed of the video was increased (see indication on the video).