PET studies of encoding and retrieval: The HERA model
L Nyberg1, R Cabeza, E Tulving
1Rotman Research Institute of Baycrest Centre, University of Toronto, North York, Ontario, Canada, lars.nyberg@psy.umu.se.
Psychonomic Bulletin & Review
|November 12, 2013
Summary
The hemispheric encoding/retrieval asymmetry (HERA) model suggests distinct roles for the left and right prefrontal cortex in human memory. Left prefrontal cortex aids semantic retrieval and new information encoding, while the right supports episodic memory retrieval.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Neuroimaging
Background:
- Human memory involves complex cognitive processes.
- Prefrontal cortical regions play a crucial role in memory functions.
- Previous research suggests hemispheric specialization in memory.
Purpose of the Study:
- To review positron emission tomography (PET) studies supporting the Hemispheric Encoding/Retrieval Asymmetry (HERA) model.
- To elucidate the differential involvement of prefrontal cortical regions in memory encoding and retrieval.
Main Methods:
- Review of existing positron emission tomography (PET) studies.
- Analysis of neuroimaging data focusing on prefrontal cortex activity during memory tasks.
Main Results:
- Converging evidence supports the HERA model.
- Left prefrontal cortex is more involved in semantic memory retrieval and novel information encoding.
- Right prefrontal cortex is more involved in episodic memory retrieval.
Conclusions:
- The HERA model provides a framework for understanding prefrontal cortex asymmetry in memory.
- This pattern of hemispheric involvement is consistent across various information types and memory conditions.
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