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In search of a recognition memory engram
1University of Bristol, School of Physiology and Pharmacology, Medical Sciences Building, Bristol BS8 1TD, UK.
Neuroscience and Biobehavioral Reviews
|October 5, 2014
Summary
Recognition memory involves familiarity discrimination and recollection, with familiarity linked to the perirhinal cortex. This brain region stores object recognition memory through synaptic weakening when stimuli are repeated.
Area of Science:
- Neuroscience
- Cognitive Psychology
Background:
- Recognition memory is crucial for daily life.
- Evidence suggests it comprises distinct processes: familiarity and recollection.
- The perirhinal cortex is implicated in familiarity discrimination.
Purpose of the Study:
- To review evidence on the perirhinal cortex's role in recognition memory.
- To explore the neural mechanisms underlying familiarity discrimination.
Main Methods:
- Analysis of human and animal studies.
- Inclusion of psychological, recording, imaging, and lesion techniques.
- Neuronal network modeling.
Main Results:
- Recognition memory involves familiarity and recollection.
- Familiarity discrimination is centered in the perirhinal cortex.
- Repeated stimulus exposure reduces neuronal responses in the perirhinal cortex, indicating synaptic weakening.
Conclusions:
- The perirhinal cortex stores object recognition memory.
- Synaptic weakening is a key mechanism for this memory storage.
- This neural mechanism is information-theoretically efficient.
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