Proactive suppression is an implicit process that cannot be summoned on demand

Area of Science:

• Cognitive Psychology
• Visual Attention
• Perceptual Control

Background:

• Proactive cognitive control allows individuals to anticipate and prepare for upcoming tasks.
• Selective attention mechanisms are crucial for filtering irrelevant information in complex visual environments.

Purpose of the Study:

• To investigate the feasibility of on-demand proactive suppression of visual distractors.
• To determine if distractor suppression can be initiated proactively based on cued information.
• To examine the impact of distractor variability on proactive suppression efficiency.

Main Methods:

• Participants performed a visual search task with cued distractor colors.
• A probe letter recall task assessed the effectiveness of distractor suppression.
• Distractor color predictability was manipulated across experiments.

Main Results:

• A probe suppression effect was observed when the distractor color was fixed.
• This effect disappeared when the distractor color varied trial-to-trial.
• Evidence against the 'search and destroy' hypothesis was found, indicating no initial search for the distractor color.

Conclusions:

• Proactive suppression of distractors is not possible on demand when the distractor identity varies.
• Reactive distractor processing is employed when suppression cannot be proactive, resulting in performance costs.
• Cognitive control mechanisms for distractor rejection are context-dependent and influenced by predictability.