Cortical reinstatement mediates the relationship between content-specific encoding activity and subsequent
Alan M Gordon1, Jesse Rissman2, Roozbeh Kiani3
1Department of Psychology.
Cerebral Cortex (New York, N.Y. : 1991)
|August 8, 2013
Summary
Recollecting past events involves brain activity in the cortex and hippocampus. This study shows how encoding strength and reinstatement in these areas guide memory decisions.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Neuroimaging
Background:
- Episodic recollection relies on encoding event features and reinstating them during retrieval.
- Cortical and hippocampal activity are crucial for successful memory recall.
Purpose of the Study:
- To investigate the roles of cortical and hippocampal activity in driving recollective memory decisions.
- To examine how encoding strength and pattern reinstatement influence memory accuracy.
Main Methods:
- Multivoxel pattern analysis of functional magnetic resonance imaging (fMRI) data.
- Encoding words with face or scene source contexts.
- Cueing subjects to recollect source associates at retrieval.
Main Results:
- Cortical encoding strength predicted memory accuracy and reaction time.
- Encoding strength correlated with hippocampal activity during encoding.
- Cortical reinstatement was influenced by encoding strength and retrieval-phase hippocampal activity.
Conclusions:
- Cortical reinstatement partially mediates the effects of encoding strength and hippocampal activity on source memory.
- Memory-guided decisions involve a pathway from hippocampal-linked cortical encoding to hippocampal-linked cortical reinstatement.
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