 The primary outcome measures will be the cerebral fMRI blood-oxygen-level dependent BOLD responses to three events: 1 shock anticipation: after collecting the cues flowers during anticipation of a potential shock, 2 context exploration: as participants navigate in the threat context or safe context in between trials which start when a flower appears in the environment, and 3 cue approach: during approach towards the flower, in the threat or safe context. The secondary outcome measures will consist of the changes in psychophysiological responses, such as SCR, heart rate, pupil dilatation, and respiratory rate, which will validate fear responses. 