Memory is one of the most dynamic and frequently tested areas in both UGC NET (Psychology) and GATE (XH-C5). Memory is far more than remembering facts. It is the encoding, storage and retrieval of information. This topic is about connecting models, processes, and practical examples to make sense of how this entire process of memorization takes place. It also focuses on the allied concept of forgetting, which is the inability to retrieve stored information. For NET and GATE aspirants, knowing the main models of memory and how they explain encoding, storage, retrieval, and forgetting can make this topic both manageable and highly scoring.
MODELS OF MEMORY
ATKINSON-SHIFFRIN MODEL (1968)
The Atkinson-Shiffrin model is one of the most classic and influential models to understand how memory works. It treats memory as a step-by-step process, divided into three main stores: sensory memory, short-term memory (STM), and long-term memory (LTM). First, information enters the sensory memory, which holds quick information of the world around us for just a few milliseconds to a couple of seconds. (for example, the flash of lightning). Only some of this information moves on to short-term memory, which can manage about 7 ± 2 items for around 20–30 seconds if we don’t rehearse them. This is where we temporarily hold and work with information—like remembering a phone number long enough to dial it. With rehearsal and proper encoding, information makes its way into long-term memory, which can store vast amounts of knowledge, experiences, and skills for potentially a lifetime. LTM is organized into semantic memory (facts), episodic memory (personal experiences), and procedural memory (skills).
Sensory Memory (SM):
- Duration: milliseconds to ~2 seconds
- Function: Holds brief impressions of sensory input
- Types:
- Iconic memory: Visual information (e.g., a lightning flash)
- Echoic memory: Auditory information (e.g., hearing a phone ring)
- Haptic memory: Touch/kinesthetic information (e.g., feeling an object’s texture)
- Role: Filters information and passes important details to STM
Short-Term Memory (STM):
- Duration: ~20–30 seconds without rehearsal
- Capacity: 7 ± 2 items
- Function: Temporary storage and manipulation of information
- Example: Remembering a phone number to dial
Long-Term Memory (LTM):
- Duration: Potentially lifelong
- Capacity: Virtually unlimited
- Function: Stores knowledge, experiences, and skills
An important feature of this model is that it views memory as a stepwise process.
2. LEVELS OF PROCESSING MODEL (1972)
The Levels of Processing model, proposed by Fergus Craik and Robert Lockhart in 1972, is a different way to look at memory compared to the classic Atkinson-Shiffrin model. Instead of thinking about memory as separate stores (sensory, short-term, long-term), this model focuses on how deeply we process information when we learn it. The central idea of this model is: the deeper we think about something, the better we remember it.
According to this model, memory is not just about storing information,it’s about processing it meaningfully. If we only pay attention to superficial details, like how a word looks or sounds, we are likely to forget it quickly. But if we think about the meaning, connect it to our own experiences, or relate it to something we already know, the memory becomes stronger and easier to retrieve.
Levels of Processing & Rehearsal
Level / Rehearsal | Focus | Example | Memory Outcome / Advantage | Limitation |
Shallow | Surface (look, sound) | Word appearance, rhyme | Weak, short-term | Forget quickly |
Intermediate | Patterns / categorization | Identifying nouns/verbs | Moderate memory | Less durable than deep |
Deep | Meaning, semantic connections | Linking to personal experience | Strong, long-lasting | Requires effort |
Maintenance Rehearsal | Repetition | Repeating a phone number | Temporary retention | Doesn’t enhance LTM |
Elaborative Rehearsal | Meaningful linkage | Connecting theory to real-life examples | Durable, long-term memory | Needs understanding |
3. BADDELEY & HITCH’S WORKING MEMORY MODEL (1974)
Earlier, Atkinson & Shiffrin described short-term memory as a “storage box” where information just sits for a while before it either fades or moves into long-term memory. But Baddeley and Hitch weren’t satisfied with that explanation. They argued that we don’t just “store” things. Instead, we are constantly thinking, comparing, rearranging, and making sense of the information we have at a given moment.
That’s why they introduced the idea of working memory. What makes their model stand out is that the working memory isn’t just one single store, but a system with different parts, each having its own specialised role
The components of the working memory model are tabulated below-
Component | Function | Example |
Central Executive | Supervisory system that controls attention, decides priorities, and coordinates the subsystems. | Focusing on solving a maths problem while ignoring background noise. |
Phonological Loop | Handles temporary storage and rehearsal of verbal/auditory information. It has two parts: (a) Phonological Store – holds spoken words briefly, and (b) Articulatory Process – rehearses and refreshes the info. | Repeating a phone number mentally until it is dialed. |
Visuospatial Sketchpad | Manages short-term storage and manipulation of visual and spatial information. It has two parts: (a) Visual Cache – stores visual details (like shape, colour), and (b) Inner Scribe – deals with spatial relationships and movement. | Visualising a map when giving directions. |
Episodic Buffer (added in 2000) | Integrates information across modalities (visual, auditory, spatial) and connects working memory with long-term memory. | Remembering a movie scene that combines dialogue and imagery. |
4. TULVING’S MODEL OF LONG-TERM MEMORY (1972, 1985)
Endel Tulving (1972, later refined in 1985) argued that long-term memory is not one single storage system, but rather a set of specialised stores. He separated it into Episodic memory, Semantic memory, and later also spoke about Procedural memory.
- Episodic Memory – It contains personal experiences which are tied to a specific time and place. It is both autobiographical as well as emotional. For example, remembering your first day at university or the way you felt during your dissertation presentation. Episodic memory is closely linked with the hippocampus and is prone to distortion because emotions can affect the way in which we encode experiences.
- Semantic Memory – It contains general knowledge, facts, and concepts that are not tied to personal experience. For example, knowing that Paris is the capital of France or that water boils at 100°C. Unlike episodic memory, semantic knowledge does not need a context of “when” or “where” you learned it.
- Procedural Memory – Tulving later acknowledged this as a third system. This system was responsible for skills and habits, such as riding a bicycle, typing, or playing the piano. These are often automatic once learned.
COMPARING THE MODELS
Model | Advantages | Disadvantages |
ATKINSON–SHIFFRIN MODEL (1968) | Simple and systematic explanation of memory, distinguishes short-term and long-term storage clearly, provides foundation for later models | Too rigid and linear, ignores active processing, underestimates complexity of STM |
LEVELS OF PROCESSING MODEL (Craik & Lockhart, 1972) | Explains why deeper processing leads to better retention, highlights quality of encoding rather than structure | Vague in defining “deep” and “shallow”, ignores role of retrieval and storage mechanisms |
WORKING MEMORY MODEL (Baddeley & Hitch, 1974) | Explains active mental work like problem-solving and comprehension, supported by strong experimental evidence, more detailed than STM concept | Limited focus on LTM, central executive role still unclear, may oversimplify real-world memory demands |
TULVING’S MODEL (1972, 1985) | Differentiates episodic, semantic, and procedural memory, captures richness of human experience, highly influential in cognitive and neuropsychology | Overlaps between types of memory, boundaries not always clear, some critics argue it complicates memory organization |
It is important to note that Tulving’s model helped explain why someone with brain damage might lose the ability to recall personal events (episodic) while still retaining facts (semantic) or motor skills (procedural).
From an exam point of view, understanding models of memory is not just about remembering dates, but also about how, over the years, the models of memory kept getting refined and how each model builds upon an earlier one. If you grasp their core concepts, applications, and critiques, you shall be able to attempt questions with utmost ease in the examination.
Blog By : Avantika Sharma