Distractor ignoring is as effective as target enhancement when incidentally learned but not when explicitly cued

Area of Science:

• Cognitive Psychology
• Neuroscience
• Visual Perception

Background:

• Explicit knowledge of target or distractor features enhances visual search performance.
• Previous research indicates explicit distractor cues yield smaller benefits than target cues, suggesting less effective suppression of irrelevant information.
• The asymmetry in performance benefits between target selection and distractor ignoring raises questions about the generalizability of feature-based attention principles.

Purpose of the Study:

• To investigate whether the asymmetry in attention benefits (target selection vs. distractor ignoring) is a general principle of feature-based attention.
• To compare the efficiency of target selection and distractor ignoring under conditions of incidental learning versus explicit instruction.
• To explore dissociable mechanisms underlying voluntary and incidentally learned attention.

Main Methods:

• Four experiments (N=75 each) involved participants searching for an orientation-defined target among distractors.
• Experiment 1 utilized incidental learning, varying the frequency of target or distractor colors.
• Experiment 2 employed explicit cues for target or distractor colors to induce voluntary attention.
• Response times were measured to assess performance benefits.

Main Results:

• Incidental learning led to comparable benefits for attending towards targets and away from distractors, suggesting equal effectiveness in learned target selection and distractor ignoring.
• Explicit cues for voluntary attention benefited both target selection and distractor ignoring, but distractor cues were significantly less effective than target cues.
• Cross-experiment analyses confirmed that the relative inefficiency of distractor ignoring compared to target selection is specific to voluntary attention.

Conclusions:

• The observed asymmetry in performance benefits between target selection and distractor ignoring is a characteristic of voluntary attention, not incidentally learned attention.
• Learned attention mechanisms can support equally effective target selection and distractor ignoring.
• Distinct neural mechanisms underlie voluntary and learned attention, particularly concerning distractor suppression.