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Thus, whereas participants in the studies by Atkinson et al.and Karnadewi and Lipp saw the same pictures repeatedly, no individual was repeated in the studies by Aguado et al.The latter difference may be important, since the faces differed in the extent of teeth display, which has been shown to affect performance in visual search for emotional expressions (Horstmann, Lipp, & Becker, ).

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Additionally, faces signal a person’s gender, age, ethnicity, and identity.

Early research was directed at understanding the processing of single facial characteristics in isolation, uncovering findings such as the “happy face advantage,” the faster categorization of happy than of angry faces (Leppänen, Tenhunen, & Hietanen, ).

Moreover, this interaction was evident also when only the top or bottom segments of the faces were presented or when the faces were inverted (Aguado et al., In the control condition, the stimuli vary only on the task-relevant dimension (e.g., participants categorize happy male and female faces by sex), whereas in the orthogonal condition, stimuli also vary on a task-irrelevant dimension (e.g., participants categorize angry and happy male and female faces by sex).

Slower performance in the orthogonal than in the control condition indicates that variation on the task-irrelevant dimension interferes with the processing of the task-relevant dimension. () were able to show that variation in poser sex slowed the categorization of emotional expressions, whereas variations in emotional expressions did not slow sex categorization. analyzed the data from their orthogonal conditions in 2 × 2 (Sex × Expression) factorial analyses of variance (ANOVAs) and failed to find evidence for a symmetrical interaction.

Thirty-two grayscale pictures were used; half depicted angry and half depicted happy faces.

All of the images were of different individuals with their hair removed and teeth displayed in the happy images.

The present study was designed to assess whether the nature of the interaction between face sex and emotional expressions in face categorization is affected by stimulus set size.

On the basis of the results reported by Aguado et al.

(who also discussed this difference across studies).

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