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via ScienceDirect Publication: Vision Research on 6/12/11
Publication year: 2011Source: Vision Research, In Press, Accepted Manuscript, Available online 12 June 2011
Manuel G., Calvo , Lauri, Nummenmaa
Saccadic and manual responses were used to investigate the speed of discrimination between happy and non-happy facial expressions in two-alternative-forced-choice tasks. The minimum latencies of correct saccadic responses indicated that the earliest time point at which discrimination occurred ranged between 200 and 280 ms, depending on type of expression. Corresponding minimun latencies for manual responses ranged between 440-500 ms. For both response modalities, visual saliency of the mouth region was a critical factor in facilitating discrimination: The more salient the mouth was in happy face targets in comparison with non-happy distracters, the faster discrimination was. Global image characteristics (e.g., luminance)...
Highlights: ► Saccade and manual responses showed early and late facial expression discrimination. ► Discrimination between expressions started 200 ms from stimulus onset. ► Visual saliency of the mouth region made a major contribution to discrimination. ► Significance of expression had little effect on both early and late discrimination. ► Saliency of a distinctive face region supports retrieval of expression significance.
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