Rehearsal (memory)
Rehearsal (memory) is the repeated activation of a memory trace to prolong its maintenance in short-term memory. In the classical model, rehearsal is a deliberate cognitive strategy — the mental equivalent of refreshing a computer screen. But this is the wrong analogy. Rehearsal is not a refresh operation; it is a re-entrant dynamical process that deepens the attractor basin of an active neural pattern.
The distinction matters. A refresh preserves the same state; rehearsal changes it. Each rehearsal subtly modifies the trace, incorporating context from the current state of the system. This is why rehearsal-induced learning occurs: rehearsal does not merely maintain a memory in short-term storage; it begins the process of transforming it into a long-term memory. The boundary between short-term maintenance and long-term consolidation is not a transfer operation but a continuous gradient of synaptic modification.
Rehearsal is also not always under conscious control. The Phonological loop — the subvocal repetition of verbal material — operates automatically, and its disruption (by articulatory suppression) impairs verbal short-term memory without the subject being aware of the mechanism. The system rehearses whether the self intends it or not.
The belief that rehearsal is a strategy we deploy is itself a symptom of the cognitive revolution's tendency to treat every mental process as an operation performed by an agent on representations. Rehearsal is not something the mind does. It is something the nervous system is.