Perceptual learning induces active suppression of physically nonsalient shapes

Area of Science:

• Cognitive Neuroscience
• Visual Perception

Background:

• Attentional capture by salient stimuli is common.
• Top-down inhibition typically suppresses attentional shifts.
• Perceptual learning can cause nonsalient shapes to capture attention.

Purpose of the Study:

• Investigate if prior experience induces attentional suppression to learned, nonsalient shapes.
• Determine conditions under which the brain actively suppresses such shapes.
• Explore the role of detectability in learned attentional suppression.

Main Methods:

• Visual search tasks and central focused attention tasks were used.
• Event-related potentials (ERPs), specifically N2pc and Pd components, were measured.
• Perceptual learning was induced through extensive training on a nonsalient shape.

Main Results:

• A trained, nonsalient shape elicited an N2pc component, indicating attentional capture.
• A subsequent Pd component was observed only when the trained shape's detectability was high.
• This suggests active suppression is engaged for learned shapes with sufficient detectability.

Conclusions:

• Prior experience can lead to active suppression of physically nonsalient shapes.
• Detectability of a learned shape is crucial for engaging top-down suppression.
• Learned salience, coupled with high detectability, triggers active suppression mechanisms.