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Stimulus set size modulates the sex-emotion interaction in face categorization
Ottmar V Lipp1, Fika Karnadewi, Belinda M Craig
1School of Psychology and Speech Pathology, Curtin University, Bentley, Western Australia, 6845, Australia, Ottmar.Lipp@curtin.edu.au.
Stimulus set size critically influences how facial features like sex and emotion interact during perception. Larger face sets show symmetrical interactions, while smaller sets do not, suggesting adaptive categorization strategies.
Area of Science:
- Cognitive Psychology
- Social Psychology
- Neuroscience
Background:
- Invariant facial features (e.g., sex) and variant features (e.g., emotions) interact during face categorization.
- Previous research is divided on whether this interaction is asymmetrical or symmetrical.
Purpose of the Study:
- To investigate the role of stimulus set size in the interaction between facial sex and emotional expression.
- To reconcile conflicting findings regarding the nature of face perception interactions.
Main Methods:
- Two experiments using faces from different databases.
- Manipulated stimulus set size (large sets vs. small subsets of four posers).
- Assessed categorization of sex and emotional expression.
Main Results:
- Replicated symmetrical interaction between face sex and emotional expression with larger stimulus sets.
- Did not find evidence for symmetrical interaction with smaller stimulus sets (four posers).
- Results align with prior research depending on set size.
Conclusions:
- Stimulus set size is a critical factor determining the interaction pattern between facial sex and emotion perception.
- Suggests that different categorization strategies are employed based on familiarity or exposure frequency.
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