Feature-based attention warps the perception of visual features.

Area of Science:

• Cognitive Neuroscience
• Visual Perception

Background:

• Selective attention enhances processing of relevant stimuli but can alter perceptual quality.
• Previous research shows attention boosts visual discrimination and apparent contrast.
• The impact of attention on perceptual distortions remains less understood.

Purpose of the Study:

• To investigate whether selective attention leads to perceptual distortions in visual representations.
• To test if attentional tuning, optimizing signal-to-noise ratio, causes phenomenological changes in visual features.
• To examine how attentional tuning adapts to task demands.

Main Methods:

• Participants performed a visual search task, selecting a target color among distractors.
• A 2-alternative forced choice task assessed the perceived appearance of the target color.
• Control experiments ruled out non-attentional explanations like color contrast or memory effects.

Main Results:

• Participants consistently perceived the target color as more dissimilar from distractor colors.
• The magnitude of this perceptual bias correlated with the similarity between target and distractor colors.
• These findings indicate that attentional tuning dynamically adapts to task demands.

Conclusions:

• Selective attention significantly warps the representational geometry of color space.
• Attention induces profound perceptual changes, altering our sensory experience.
• Efficient attentional selection may incur a perceptual cost through sensory distortion.