Diagnostic Features of Emotional Expressions Are Processed Preferentially

Scheller, Elisa; Büchel, Christian; Gamer, Matthias · 2012 · OpenAlex-citations

DOI: 10.1371/journal.pone.0041792

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Summary

This study investigates whether human observers preferentially attend to the diagnostic features of emotional facial expressions (e.g., eyes for fear, mouth for happiness) automatically, independent of task demands or spatial location. While previous research established that specific facial regions are critical for identifying emotions, it remained unclear if gaze patterns were driven by conscious task strategies, low-level visual saliency, or automatic, preattentive mechanisms. The authors aimed to clarify whether these gaze preferences reflect a reflexive process that facilitates the rapid detection of emotional states. To address this, the researchers conducted two eye-tracking experiments with healthy participants. In Experiment 1, subjects viewed fearful, happy, and neutral faces while performing emotion classification, gender discrimination, or passive viewing tasks. Stimuli were presented for either 150 ms (preventing saccades during presentation) or 2000 ms (allowing detailed scanning). Initial fixation was manipulated to start on either the eyes or mouth. In Experiment 2, faces were presented at varying vertical positions (upper, middle, lower visual field) to rule out biases toward specific visual field locations. Stimuli in both experiments were controlled for low-level image saliency to ensure that gaze patterns were not driven by bottom-up visual features like contrast or luminance. The results demonstrated a robust preference for fixating the eye region across all conditions. Crucially, this preference was modulated by emotional expression: participants directed more attention to the eyes for fearful and neutral faces, whereas they attended more to the mouth for happy faces. These patterns persisted regardless of the task performed, the duration of stimulus presentation, or the initial fixation point. Furthermore, when stimuli were presented at different spatial locations in Experiment 2, the same emotion-specific gaze biases remained, confirming that the effects were not due to a general bias for the upper visual field. Saliency analyses confirmed that computational models of bottom-up attention could not account for these findings, as gaze preferences persisted even when low-level features were equated across facial regions. The authors conclude that diagnostic features of emotional expressions are processed preferentially via an automatic, preattentive mechanism. This mechanism appears to operate independently of conscious task goals and low-level visual saliency, suggesting that the visual system is tuned to rapidly extract socially relevant information. The study implies that this automatic processing likely depends on amygdala functioning and may be impaired in clinical conditions such as autism spectrum disorder or social anxiety, where social cognition is disrupted. These findings highlight the efficiency of human face perception in prioritizing diagnostically relevant facial features for rapid emotional interpretation.

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• gaze based attention detection