Categorical effects in the perception of faces

Area of Science:

• Cognitive Psychology
• Neuroscience
• Human Perception

Background:

• Categorical perception is typically studied with low-level sensory stimuli.
• Its occurrence in higher-level cognitive domains, like face recognition, is less understood.

Purpose of the Study:

• To investigate whether categorical perception applies to the recognition of individual familiar faces.
• To determine if experience influences categorical perception of faces.

Main Methods:

• Generated linear continua of morphed faces between familiar individuals.
• Administered categorization, discrimination, and 'better-likeness' tasks using these continua.

Main Results:

• Participants discriminated faces most accurately when pairs crossed apparent category boundaries, indicating categorical perception.
• A strong correlation was observed between face familiarity and the magnitude of the categorization effect.

Conclusions:

• Categorical perception extends beyond low-level stimuli to higher-level representations like individual faces.
• Experience and familiarity significantly contribute to the development of categorical perception in face recognition.