Goal-relevant events need not be rare to boost memory for concurrent images

Area of Science:

• Cognitive Psychology
• Neuroscience
• Visual Attention

Background:

• The attentional boost effect describes enhanced memory for stimuli concurrent with target detection.
• Previous research often used rare targets, raising questions about frequency's role in this effect.

Purpose of the Study:

• To investigate if the attentional boost effect persists when target and distractor frequencies are equated.
• To determine if stimulus rarity drives the attentional boost effect or if it's related to attentional engagement.

Main Methods:

• Four experiments were conducted where participants encoded images while monitoring a separate stimulus stream for targets.
• Target and distractor frequencies were manipulated (1:1 and 1:6 ratios).
• Target detection involved either an overt button press or covert counting.

Main Results:

• The attentional boost effect was observed when target and distractor frequencies were equal (1:1 ratio).
• This effect persisted regardless of whether target detection was overt or covert.
• Memory enhancement was absent for images presented with rare distractors.

Conclusions:

• The attentional boost effect is not solely driven by oddball or distinctiveness effects related to stimulus frequency.
• Selectively attending to events requiring a response (overt or covert) enhances the processing of concurrent information.
• This suggests that attentional engagement, rather than mere stimulus rarity, is key to the attentional boost effect.