Divided attention can enhance early-phase memory encoding: the attentional boost effect and study trial duration

Area of Science:

• Cognitive Psychology
• Neuroscience
• Memory Research

Background:

• Divided attention typically impairs memory recall.
• The attentional boost effect (ABE) is an exception where memory improves with targets during divided attention.
• ABE involves stimuli presented with targets versus distractors.

Purpose of the Study:

• To investigate the temporal phase of memory encoding responsible for the ABE.
• To determine if ABE occurs during early perception/comprehension or later elaborative rehearsal.
• To test predictions of an early-phase encoding account of ABE.

Main Methods:

• Experiments used stimuli (words) paired with targets or distractors under varying study durations (400 ms, 700 ms, 1500 ms, 4000 ms).
• Memory performance was assessed via recognition accuracy.
• Conditions included divided attention (with targets/distractors) and full attention.

Main Results:

• ABE was robust at short durations (700 ms) and did not increase with longer durations.
• Memory in the target condition matched full attention at short durations.
• At very short durations (400 ms), divided attention with targets yielded superior memory compared to full attention.

Conclusions:

• The ABE originates in the early stages of memory encoding (perception and comprehension).
• The findings support an early-phase encoding account, challenging traditional views of divided attention effects.
• ABE demonstrates that focused attention is not always necessary for optimal memory encoding, particularly under specific temporal constraints.