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Event-related potential correlates of item and source memory strength.
Brion Woroch1, Brian D Gonsalves
1Department of Psychology, University of Illinois, IL 61820, USA. bworoch2@illinois.edu
Event-related potential (ERP) studies reveal that the late parietal effect (LPC) is sensitive to source memory strength, not just accuracy. This suggests source memory may operate on a continuum, not a threshold.
Area of Science:
- Cognitive Neuroscience
- Psychology
- Neuroscience
Background:
- Event-related potential (ERP) studies differentiate item and source memory recognition.
- Item recognition links to the mid-frontal FN400, varying with memory strength.
- Source memory links to the late parietal effect (LPC), debated as continuous or threshold-based.
Purpose of the Study:
- Investigate electrophysiological correlates of item and source memory strength.
- Test if the late parietal effect (LPC) reflects varying source memory strength.
- Clarify if source memory operates on a continuum or as a threshold process.
Main Methods:
- Participants encoded visual objects with conceptual or perceptual judgments.
- A memory test involved old/new decisions and source memory confidence judgments.
- Event-related potentials (ERPs) were analyzed for memory strength correlates.
Main Results:
- Item memory showed differences in the 300-500 ms window (FN400).
- LPC amplitude differed between correct and incorrect source decisions.
- Comparing low and high confidence source decisions revealed LPC differences.
Conclusions:
- The late parietal effect (LPC) is sensitive to variations in source memory strength.
- Findings suggest source memory strength varies along a continuum.
- ERP measures provide insights into the continuous nature of memory strength.
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