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Memory encodes, stores, and retrieves information over time to guide future action, but it can be impaired by factors affecting encoding, storage, or retrieval.
Memory is the faculty of the mind that encodes, stores, and retrieves information when needed; it is also described as the retention of information over time that can influence future action. Without the ability to remember past events, core human capacities such as language, relationships, and personal identity would not develop. Memory can be impaired through forgetfulness or disorders such as amnesia, and it is not a perfect system—encoding, storage, and retrieval can all be disrupted by factors like pain, brain damage (e.g., to the hippocampus), and decay within long-term memory. Memory is often modeled as an information-processing system with multiple forms and functions. Sensory memory briefly holds incoming information (less than about a second) automatically and out of cognitive control; it includes iconic (visual), echoic (auditory), and haptic (touch) stores that decay very quickly. Working memory (often distinguished from short-term memory) supports encoding and retrieval over seconds, while long-term memory stores information for much longer durations, potentially for a lifetime. Long-term memory is commonly divided into declarative (explicit, conscious) memory—such as semantic (meaning-based) and episodic (time-and-place events)—and non-declarative (implicit, unconscious) memory, including procedural learning and priming. Beyond describing types, memory’s functions also include how information is strengthened and made durable. Encoding is improved by “deep” processing (e.g., focusing on meaning) and by matching retrieval cues to those present during learning (encoding specificity), with context dependence also affecting recall. Transition from short-term to long-term storage is called memory consolidation, supported by brain mechanisms such as hippocampal involvement in learning and consolidation. At molecular levels, long-term memory formation involves gene transcription, new protein synthesis, and epigenetic changes (e.g., DNA methylation/demethylation) that help stabilize synaptic changes across distributed brain networks.
Memory encodes, stores, and retrieves information over time to guide future action, but it can be impaired by factors affecting encoding, storage, or retrieval.
Memory is commonly described through multiple stores: sensory memory (very brief), working/short-term memory (limited capacity over seconds), and long-term memory (large capacity over long durations).
Long-term memory includes declarative (semantic and episodic) and non-declarative (implicit) forms, and consolidation plus molecular/epigenetic processes help stabilize memories.
Memory is the mental faculty that encodes, stores, and retrieves information over time to influence future action.
Sensory memory briefly holds information from the senses for less than about one second after perception.
Working memory is an active system that temporarily maintains and manipulates information for encoding and retrieval.
Long-term memory is the system that stores information for extended periods, potentially for a lifetime.
Declarative memory is conscious storage and recollection of information, including semantic and episodic forms.
Semantic memory stores knowledge encoded with meaning, such as facts about the world.
Episodic memory stores events encoded with information about when and where they occurred.
Non-declarative memory is unconscious storage and recollection, such as procedural learning and priming.
Priming is the process by which prior exposure unconsciously facilitates later responses, often without conscious awareness.
Procedural memory is the gradual, often unconscious learning of skills.
Memory consolidation is the process by which information transitions from short-term storage to long-term storage.
Encoding specificity is the principle that recall is better when retrieval cues match the cues present during learning.
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