Studies have revealed a valence-specific laterality effect. i.e., positive facial expressions are perceived more accurately in the right visual field, whereas negative facial expressions are perceived more accurately in the left visual field (e.g., Jansari, Tranel, & Adolphs, 2000). We presented a pair of faces with emotional labels (happy or angry), and then asked participants (24 females and 24 males) to select the face that best depicted the emotion corresponding to the emotional label. We

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... und that participants' choices were biased toward a face on the right side for faces with the happy label, but biased toward a face on the left side for faces with the angry label. This tendency was significantly enhanced when it was difficult to discriminate the expressions between a pair of faces. These results suggest that the valence-specific laterality effect is due to response bias rather than visual field advantage for each type of positive/negative face.