These tasks measure emotional responding that may be altered by psilocybin.

Emotional discrimination task: participants were presented with images of emotional facial expressions or shapes (control), and were instructed to discriminate between the images.

Emotion recognition task: participants were presented images of actors and were asked to identify the emotional facial expression (happy, sad, fear, angry, neutral) of each actor.

Emotional conflict Stroop task: participants were shown emotional facial expressions (targets) with emotional words overlain (distractors) and were asked to identify the valence of the facial expression, either positive or negative.