Memory consolidation

Memory consolidation is the process by which newly formed memories become more stable over time. It involves changes that make memories less vulnerable to disruption and, in some cases, reorganize how they are represented.

Synaptic consolidation: The early stabilization of a memory through molecular and structural changes at synapses. It describes the rapid, local changes that begin stabilizing memories after learning.
Memory: The capacity to encode, retain, and retrieve information from past experience. Consolidation is one process within the broader life cycle of memory.
Standard model of systems consolidation: A theory proposing that hippocampal dependence for declarative memories declines as cortical connections strengthen over time. It predicts a gradual transfer of memory dependence from hippocampus to cortex.
Patient H.M.: Henry Molaison, whose medial temporal lobe surgery caused severe difficulty forming new declarative memories. His case exposed the hippocampal system's role in forming lasting memories.
Systems consolidation: The gradual reorganization of memory representations across interacting brain regions. It captures longer-term changes in how memories depend on the hippocampus and cortex.
Memory encoding: The transformation of experience into a form that can be stored and later retrieved. Consolidation acts on memory traces formed during encoding.
Multiple trace theory: A theory proposing that vivid episodic memories continue to depend on hippocampal traces, even when older. It challenges the idea that all consolidated episodic memories become independent of the hippocampus.
Morris water maze: A test in which rodents learn to find a hidden platform in a pool using spatial cues. Studies of post-training sleep and disruption use this task to measure memory stability.
Hippocampus: A medial temporal lobe structure essential for forming and retrieving many episodic memories. It helps bind new experiences and supports their gradual integration into cortical networks.
Memory retrieval: The process of accessing information stored in memory. Retrieval can reveal a memory and sometimes make it available for further change.

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