CFPT: Cambridge Face Perception Test
In this task (Duchaine et al., 2007), participants sort 6 faces according to their similarity to a single reference face. measures the ability to distinguish small differences between faces. 16 trials. The stimuli to sort are versions of the target face morphed with other faces at varying levels. In addition, half the trials have inverted stimuli. The score is calculated based on the distance of the sorted items to their actual similarity position.