A focused explanation
What is long-term memory?
A lasting store of information
Long-term memory refers to information retained beyond the brief span of working or short-term memory. It includes knowledge, personal experiences, habits, and skills. Its capacity is not treated as a simple fixed container: memories are formed, strengthened, changed, and sometimes difficult to retrieve.
Remembering is an active process. New information is encoded, connected with existing knowledge, and later retrieved when a suitable cue appears. Attention, repetition, meaning, sleep, and emotional context can all influence how well learning is retained.
Two broad forms of long-term memory
Long-term memory is often divided into explicit memory and implicit memory. The distinction describes whether recall is conscious and reportable or expressed through performance and behaviour.
Explicit memory
Also called declarative memory, this includes facts and events that we can consciously recall and describe.
Implicit memory
Also called non-declarative or procedural memory, this supports learned actions and skills without deliberate verbal recall.
Explicit memory: facts and events
Explicit memory allows us to consciously bring information to mind. It includes knowing what a word means, recalling a lesson, or remembering something that happened in a particular place and time.
Semantic memory
Semantic memory stores general knowledge and meanings. Examples include understanding the concept of a book, knowing that multiplication combines quantities, or recognising the meaning of the word “memory”. This knowledge is not tied to one particular episode.
Episodic memory
Episodic memory concerns personally experienced events and their context. It can include remembering a recent meal, a school activity, or the circumstances in which you met someone. Because it depends on details about time and place, episodic recall can vary between people and across life stages.
Implicit and procedural memory
Implicit memory is expressed through performance rather than conscious description. Procedural learning helps us carry out familiar actions such as walking, speaking, typing, or riding a bicycle. With practice, these actions can become more automatic and require less deliberate attention.
Different brain regions contribute to memory. The hippocampus and nearby medial temporal structures are important for forming many new explicit memories, while networks involving the cortex, striatum, and other areas support stored knowledge, habits, and skills. Memory is distributed rather than held in one single location.