This figure shows the different stimuli used as safety signals (and control) for each experiment. (A) The stimulus used as safety signal Experiments 1 and 4. All participants were trained with the same safety signal (aqua square), and the control during the test phase was no safety signal. (B) The stimuli used in Experiment 2. Participants were trained with either green or blue squares. During the test, the control was the square that they had not been trained with. (C) The stimuli used in Experiment 3. Participants were trained with either a square or triangle and this was either pink or green. During the test, the control was the opposite shape and color. For example, if a participant was trained with a green triangle, then the control during the test was a pink square. Stimuli were counterbalanced.
