Figure 1
From: Neural basis of negativity bias in the perception of ambiguous facial expression
Face stimuli and the two-alternative forced choice task. (a) Representative example of the graded emotional facial expression stimuli used in the task, ranging from a 100% happy face to a 100% sad face. For the purpose of presentation, these example images were constructed by morphing the laboratory members and were not used in this experiment. (b) Two-alternative forced choice task. Ambiguous face trials were preceded by either “happy” or “sad” face trials. ITI: inter-trial interval.
