Solso and McCarthy did the prototype effect experiment (1981) combining hair, eyes, nose + chin, and mouth and produced few examples variating some of those components. Prototype effect is a tendency to recognize the face by corresponding to the central value of a series of seen faces, even when this central value (prototype) has not been seen. The critical finding was that subjects confidently misidentified the prototype face with formerly seen face. The results were the same in second experiment as well.