Class | Subject | Book | Chapter | Session | Questions covered |
|---|---|---|---|---|---|
XI | Psychology | Psychology (NCERT) | 6 – Human Memory | 2026-27 | 7 of 7 |
Chapter at a glance
Topic | Key points |
|---|---|
Memory | Retention of information over time; stages: encoding, storage, retrieval |
Stage model (Atkinson & Shiffrin) | Sensory memory (≈1 s, large capacity), short-term memory (≈18–30 s, 7 ± 2 items), long-term memory (permanent, unlimited) |
Levels of processing (Craik & Lockhart) | Structural, phonetic, semantic processing; deeper processing = better retention |
Rehearsal | Maintenance rehearsal (repetition) vs elaborative rehearsal (linking with existing knowledge) |
Types of LTM | Declarative (episodic, semantic) and procedural |
Forgetting | Trace decay, interference (proactive, retroactive), retrieval failure |
Improving memory | Mnemonics (keyword, method of loci, chunking, first-letter technique), deep processing, minimising interference |
Exercise Questions
What is the meaning of the terms ‘encoding’, ‘storage’ and ‘retrieval’?
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- Encoding: the first stage, in which information is received and registered by the sensory system and converted into a form (neural code) that can be stored — acoustic, visual or semantic.
- Storage: the second stage, in which encoded information is retained and held over a period of time for later use.
- Retrieval: the third stage, in which stored information is brought back into awareness to be used for tasks such as problem-solving or answering questions.
Failure at any stage leads to memory failure (forgetting).
Encoding converts incoming information into a storable code; storage retains it over time; retrieval brings it back to awareness for use.
How is information processed through sensory, short-term and long-term memory systems?
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According to the stage model (Atkinson and Shiffrin, 1968):
- Sensory memory: all incoming information first registers here. It has a large capacity but very short duration (less than a second; iconic for visual, echoic for auditory). Information that receives attention passes to the next stage; the rest decays.
- Short-term memory (STM): holds a small amount of information — about 7 ± 2 items — for about 18–30 seconds, encoded mainly acoustically. Information can be kept longer by rehearsal; otherwise it is lost through decay or displacement.
- Long-term memory (LTM): information that is rehearsed and encoded semantically is transferred to LTM, which has unlimited capacity and lasts for a lifetime. Information is retrieved from LTM back to STM (working memory) when needed.
Information enters large but brief sensory memory; attended items move to short-term memory (7 ± 2 items, ~18–30 s), where rehearsal transfers them to unlimited, permanent long-term memory, from which they can be retrieved.
How are maintenance rehearsals different from elaborative rehearsals?
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Maintenance rehearsal | Elaborative rehearsal |
|---|---|
Simple repetition of information (e.g. repeating a phone number) | Relating new information to existing knowledge and analysing its meaning |
Keeps information in short-term memory as long as it is repeated | Helps transfer information to long-term memory |
Shallow processing; information is easily forgotten | Deep (semantic) processing; better retention |
E.g. repeating a word list over and over | E.g. linking “photosynthesis” to the cooking of food by plants using sunlight |
Maintenance rehearsal is mere repetition that keeps information in STM; elaborative rehearsal links new information meaningfully with existing knowledge, transferring it to LTM.
Differentiate between declarative and procedural memories?
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Declarative memory | Procedural memory |
|---|---|
Memory of facts, names, dates, events — “knowing that” | Memory of how to do things — skills and procedures — “knowing how” |
Can be verbally described | Difficult to describe in words |
Includes episodic (personal experiences, e.g. your first day at school) and semantic (general knowledge, e.g. the capital of India) memory | E.g. riding a bicycle, typing, tying shoelaces, swimming |
Accessible to conscious awareness (explicit) | Often unconscious (implicit) |
Declarative memory stores facts and events that can be stated (episodic and semantic); procedural memory stores skills and how to perform them, which are hard to verbalise.
Why does forgetting take place?
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- Trace decay (disuse): memory traces fade with time if not used. (This explains some forgetting but not all — time alone is not enough.)
- Interference: other learning disrupts memory —
- Proactive interference: old learning interferes with recall of new learning (e.g. writing last year’s date in January).
- Retroactive interference: new learning interferes with recall of old learning (e.g. a new phone number making you forget the old one).
- Retrieval failure: information is stored but cannot be accessed because suitable retrieval cues are absent (tip-of-the-tongue phenomenon). Providing cues helps recall.
- Motivated forgetting (repression of unpleasant memories), and brain damage can also cause forgetting.
Because of trace decay, interference (proactive and retroactive), retrieval failure due to absent cues, and also motivated forgetting or brain damage.
How is retrieval related forgetting different from forgetting due to interference?
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Retrieval-related forgetting | Forgetting due to interference |
|---|---|
Information is available in memory but not accessible because appropriate retrieval cues are absent | Information is forgotten because other learning interferes with storage or recall |
Providing the right cue (context, a hint) can bring back the memory — e.g. tip-of-the-tongue | Depends on the similarity between learnings — proactive (old interferes with new) or retroactive (new interferes with old) |
Memory is intact; the problem is access | Memories compete with each other |
Explained by Tulving’s cue-dependent theory | Explained by interference theory |
Retrieval-related forgetting occurs when stored information cannot be accessed for lack of cues (memory intact); interference forgetting occurs when other learning (proactive or retroactive) competes with and disrupts the memory.
Define mnemonics? Suggest a plan to improve your own memory.
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Mnemonics are memory aids or strategies that help in encoding and retrieving information by organising it or linking it with images or familiar cues.
Mnemonic techniques
- Keyword method — linking a new word with a familiar word and image (useful for foreign languages).
- Method of loci — placing items to be remembered in familiar locations along an imagined route.
- Chunking — grouping items into meaningful units (e.g. a phone number in groups).
- First-letter technique (acronyms/acrostics) — e.g. VIBGYOR for rainbow colours.
My plan to improve memory
- Understand the material rather than rote learning; use elaborative rehearsal — relate new ideas to what I already know.
- Organise notes into headings, flow charts and mind maps; use chunking.
- Use mnemonics — acronyms, imagery, method of loci for lists.
- Spaced practice — revise at intervals rather than cramming.
- Self-testing — recall from memory and check (retrieval practice).
- Minimise interference — study similar subjects at different times; sleep after learning.
- Use the PQRST method — Preview, Question, Read, Self-recitation, Test.
- Maintain good health: adequate sleep, diet, exercise and stress management.
Mnemonics are strategies (keyword method, method of loci, chunking, acronyms) that aid encoding and retrieval. Plan: understand and elaborate, organise notes, use mnemonics, space revision, self-test, avoid interference, use PQRST and stay healthy.
Topic checklist
- Encoding, storage and retrieval
- Stage model of memory
- Levels of processing; rehearsal
- Types of long-term memory
- Forgetting and memory improvement (mnemonics)