Does source memory exist for unrecognized items?

Area of Science:

• Cognitive Psychology
• Neuroscience
• Memory Research

Background:

• Episodic memory research debates all-or-none vs. continuous retrieval models.
• Models differ on retrieving source details for unrecognized items.
• Prior studies show mixed results for source memory without recognition.

Purpose of the Study:

• Investigate source memory for unrecognized items across different experimental designs.
• Clarify the debate between all-or-none and continuous memory retrieval models.
• Determine the artifactual nature of previously observed effects.

Main Methods:

• Employed three experimental sets with design manipulations.
• Compared simultaneous and blocked recognition/source judgment designs.
• Utilized hierarchical Bayesian modeling to analyze participant-level data.

Main Results:

• Source memory for unrecognized items was higher in blocked designs, but this was likely artifactual.
• Evidence suggests item memory changes between blocks in blocked designs.
• Subtle source memory effects for unrecognized items exist in simultaneous designs, especially with low uncertainty.

Conclusions:

• Findings challenge simple all-or-none retrieval models.
• Artifacts in blocked designs can inflate source memory estimates.
• Subtle source memory for unrecognized items is detectable with appropriate analytical methods.