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Published on: October 19, 2014
High-level attentional selection results in repulsive biases in face space
1Psychological and Brain Sciences Department, Dartmouth College.
Summary
Attention helps select visually similar faces by making them seem more distinct. This study shows attentional repulsion extends to complex, high-level stimuli like facial emotions.
Area of Science:
- Cognitive Psychology
- Neuroscience
- Visual Perception
Background:
- Object-based attention aids processing of attended items.
- Selection within categories, especially with similar features, is less understood.
- Attention can exaggerate differences between low-level features.
Purpose of the Study:
- To investigate how attention selects visually similar objects within the same category.
- To determine if attentional effects seen with simple features apply to complex stimuli like faces.
- To explore if attention enhances perceptual distinctiveness for high-level stimuli.
Main Methods:
- Participants performed visual search for a target face among similar or distinct distractors.
- Distractors varied in emotional expression, differing only in this high-level feature.
- A two-alternative forced choice task probed the perceptual representation of the target face's emotion.
Main Results:
- Participants perceived the target face's emotion as more distinct when search similarity was high.
- This effect occurred when selecting between visually similar faces.
- Attentional bias increased perceptual distinctiveness, supporting selection.
Conclusions:
- Attention can bias representations of complex, high-level stimuli.
- This bias increases perceptual distinctiveness between targets and similar distractors.
- Findings mirror attentional repulsion effects previously seen with low-level features.
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