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Emotional memory formation under lower versus higher stress conditions
Inna Kogan1, Gal Richter-Levin
1Department of Psychology and the Brain and Behavior Research Center, University of Haifa Haifa, Israel.
Frontiers in Behavioral Neuroscience
|December 17, 2010
Summary
Stress can enhance memory, but high stress makes memory consolidation vulnerable. However, uninterrupted consolidation under high stress improves retention, revealing complex stress-memory interactions.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Behavioral Science
Background:
- Stress enhances memory for emotional events, potentially via amygdala modulation of other brain regions.
- Previous studies showed increased amygdala activation and reduced CA1 activation under higher stress during spatial learning.
- Impaired retention occurred under higher stress when spatial learning was followed by interference.
Purpose of the Study:
- To investigate how amygdala activation levels under varying stress influence spatial memory consolidation quality.
- To explore the impact of stress-induced interference and training protocols on memory retention.
Main Methods:
- Manipulating stress levels during spatial learning in a water maze.
- Introducing foot shock interference post-training or varying acquisition trials (brief vs. full).
- Comparing massed training versus spaced training (3 days) protocols.
Main Results:
- Heightened emotionality (stress) reduces memory consolidation effectiveness and increases vulnerability to interference.
- When memory consolidation is not interrupted, retention is improved, even under higher stress.
- Differential effects of stress on memory consolidation depend on interference and training protocols.
Conclusions:
- Stress-induced amygdala activation has complex effects on memory consolidation.
- High stress can impair memory by increasing vulnerability to interference but may enhance retention if consolidation is undisturbed.
- These findings highlight the intricate relationship between stress, particularly traumatic stress, and memory formation.
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