Classification images (CIs) can reveal observers' strategies in a variety of visual tasks. However, one weakness of the CI method is that many trials are needed to obtain stable data. We used sampled face presentation technique to get CIs with fewer number of trials (2,900 trials or fewer) for applying CIs to clinical populations, and compared the face processing strategy between typically-developed and autisitic observers. Basically, typical observers strongly used the region of eyes and eyebrows, and autistic observers did not use those regions. However, there were individual differences within a group: some of autistic observers used the similar region to typically developed and vice versa.
