Incidental Encoding of Objects during Search Is Stronger Than Intentional Memorization due to Increased Recollection...

Area of Science:

• Cognitive Neuroscience
• Psychology
• Memory Research

Background:

• Memory is often formed incidentally as a byproduct of natural behavior, not deliberate encoding.
• The search superiority effect demonstrates that memories formed during visual search can be stronger than intentionally memorized content.
• It remains unclear whether this effect stems from quantitative memory strength or qualitative differences in recollection and familiarity.

Purpose of the Study:

• To investigate whether the search superiority effect is driven by quantitative memory differences or qualitative shifts in recollection and familiarity.
• To examine the behavioral and neural underpinnings of memory formation during visual search versus intentional memorization.

Main Methods:

• Employed signal detection modeling, introspective remember-know judgments, and receiver operating characteristics.
• Utilized event-related electroencephalography (EEG) potentials and eye-tracking measures.
• A preregistered study with 30 participants performing visual search and intentional memorization tasks followed by a surprise recognition test.

Main Results:

• Behavioral data indicated that search targets were more frequently recollected than intentionally memorized objects, with no significant difference in familiarity.
• Event-related EEG potentials (mid-frontal negativity and parietal late component) did not differ between the two memory tasks.
• The parietal late component (LPC), a neural marker of recollection, was sensitive to memory differences in the intentional memorization task but not in the visual search task.

Conclusions:

• Search superiority in memory is predominantly driven by enhanced recollection, not familiarity.
• Established neural markers for recollection may function differently for incidentally formed memories in ecologically valid tasks compared to reductionist laboratory settings.
• This suggests that naturalistic memory formation may engage distinct neural processes.