Neurostatistical Model of Memory
Outline
Neurostatistical Model of Memory describes processes underlying the formation of long-term memory. In the model, memories are described by four core properties: stability, coherence, retrievability, and complexity.
Origins
The neurostatistical model of memory was based on statistical properties of long-term memory derived from the memory effects of varied spaced review schedules. It expands the two component model of memory beyond the molecular interpretation by involving structural and neural aspects of long term changes in properties of memory. The model provides basic functional ingredients needed for the brain to function as a concept network.
New concepts
In addition to the skeletal ideas of the two component model of memory, the new contributions of the model are:
- statistical model of Retrievability based on neural network interference
- model of Stability based on the translocation of AMPA receptors, the growth of dendritic spines and synaptic changes in sleep (see: Two-component model of memory stability)
- hypothetical model of the spacing effect based on the clearance of dendritic filopodia (see: Structural and molecular mechanisms of the spacing effect)
- memory Coherence model (incl. memory consolidation in sleep)
- memory Complexity model
Learning
According to the model, learning would result in dendritic spine tagging, insertion of AMPA receptors, and elimination of untagged spines. Inverse tagging might be use to eliminate interfering connections. Learning would then result in a net loss of dendritic spines. In addition, spacing effect could arise from the need to clear dendritic filopodia from the site undergoing stabilization. The exploratory growth of filopodia would be a response to reduced postsynaptic activity.
Contributors
Piotr Wozniak, George Zonnios (spacing effect), Darek Murakowski, Janusz Murakowski (two component model of memory), Edward Gorzelanczyk (molecular memory).
This glossary entry is used to explain texts in SuperMemo Guru series on memory, learning, creativity, and problem solving