Second-order relational properties and the inversion effect: testing a theory of face perception.

Area of Science:

• Cognitive Psychology
• Neuroscience
• Visual Perception

Background:

• Face recognition is disproportionately affected by image inversion compared to other objects.
• This inversion effect was previously thought to indicate specialized face-recognition mechanisms.
• An alternative hypothesis suggested second-order relational properties, crucial for faces, explain this effect.

Purpose of the Study:

• To test the hypothesis that reliance on second-order relational properties explains the face inversion effect.
• To investigate whether second-order relational properties are uniquely responsible for the inversion effect in visual recognition.

Main Methods:

• Two experiments were conducted using dot patterns.
• Participants identified patterns varying in their reliance on first-order versus second-order relational properties.
• The impact of inversion on the identification of these different pattern types was compared.

Main Results:

• Inversion did not disproportionately impair the identification of patterns requiring second-order relational properties.
• The effect of inversion was comparable for both first-order and second-order relational patterns.
• These findings contradict the hypothesis linking second-order properties to the face inversion effect.

Conclusions:

• The hypothesis that second-order relational properties are the primary cause of the face inversion effect is not supported.
• The unique impairment of face recognition by inversion may not be solely attributable to the encoding of second-order relational information.
• Further research is needed to fully understand the mechanisms underlying the face inversion effect.