Multi-Store Model of Memory

Atkinson and Shiffrin (1968) Multi-Store Model of Memory

The multi-store model of memory, also known as the modal model, was proposed by Richard Atkinson and Richard Shiffrin in 1968. This is one of the earliest models of memory. The MSM describes the flow between three store components: i.e., the process of placing newly acquired information into memory. Each of the store components has its characteristics.

Three variables can be used to describe the stores that information passes through: capacity, coding, and duration.

Information entering the brain via the senses is stored in various forms.

There are three main ways in which information can be encoded:

1. Visual coding refers to transferring information that you see to memory, for example, reading a map.
2. Acoustic coding refers to transferring the information you hear to memory, for example, by listening to podcasts.
3. Semantic coding refers to transferring meaning that you understand to memory, for example, the concept of infinity in maths.

Last, duration refers to how long the information is available for retrieval or lasts in the memory store.

Multi-Store Model of Memory: Description

The multi-store model of memory is also known as the modal model. The model was proposed by Atkinson and Shiffrin in 1968. It is a structural model that consists of three core components that work together in a linear fashion.

The MST has three-store components: the sensory register (SR), short-term memory (STM), and long-term memory (LTM). Each store is a unitary structure. Memory is formed sequentially, and information passes from one store component in the model to the next in a fixed and linear order.

Multi-Store Model of Memory: Sensory Register

The sensory register (SR) is the first store in the MSM, which includes information from all five senses. Information is coded differently according to the senses, so five stores are in the sensory register. The main stores include iconic memory (visual information is coded visually) and echoic memory (auditory information is coded acoustically).

Multi-Store Model of Memory: Short-term Memory

Short-term memory (STM) has a limited duration. Information in STM will quickly decay if not rehearsed. Also, STM has a limited capacity of only 7 +/- 2 items; information will be displaced by new information entering STM. Information in the STM is coded mainly acoustically.

Rehearsal is needed to keep information in STM. This process is called maintenance rehearsal. Further prolonged rehearsal (a long rehearsal period) will move information from STM to long-term memory (LTM) to establish the linear sequence.

Multi-Store Model of Memory: Long-term memory

Long-term memory (LTM) has potentially unlimited capacity and duration. Information in LTM is mainly coded semantically. Obtaining information from LTM entails the process of information travelling back through STM, known as retrieval. Forgetting can occur if you cannot locate the memory in LTM or if the memory was never made permanent in the first place.

Multi-Store Model of Memory: Outline and Evaluation

The MSM has been tested in multiple psychological studies. The MSM has successfully explained behavioural change due to brain damage. In 2008, Wilson, Kopelmand and Kapur assessed patient CW, a professional musician who suffered from amnesia after being diagnosed with a neurological disorder.

Patient CW was able to recognise his handwriting as well as clips of himself. However, he reported not being conscious at the time of the clips. This case study provides evidence of a sensory register that processes memory from the sense.

Difference between the Multi-Model of Memory and Working Memory

Baddeley and Hitch (1974) developed a working memory model (WMM) which challenges the MSM. The central distinction of Baddeley and Hitch's (1974) theory was that they believed short-term memory did not consist of a single store but included multiple stores. The three components of short-term memory are:

1. Central executive: is the component that allocates information to any of the two memory stores. It involves other higher-order processing, such as cognitive tasks, including problem-solving or mental arithmetic. It can be seen as the memory organiser or boss involved in the most complex processes and organises information into the two memory stores.
2. The visuospatial sketchpad is the working memory component that stores and processes visual information. The visuospatial sketchpad is central for humans to be able to navigate the world.
3. Phonological loop: this is the component in charge of both spoken and written semantic material. It has two subdivisions that deal with different information.
   • The phonological store processes speech and stores words. This can be understood as the inner ear, which holds information for a very short amount of time (1-2 seconds)
   • The articulatory control process is the memory system in charge of the articulation and production of speech. It can be understood as the inner voice.

According to Baddeley and Hitch, information comes together at the central executive, creating a situation's whole picture. According to this model, information rehearsed in short-term memory will also be stored in long-term memory.

Furthermore, Baddeley and Hitch explained that multi-tasking is only possible if two different components of working memory are involved.

Strengths and Weaknesses of the Multi-Store Memory Model

This section presents a critical evaluation of the strengths and weaknesses of the multi-store memory model.

In terms of weaknesses:

• The fact that the MSM accounts for single memory storage of short and long-term memory allows the criticism of the model for oversimplification. Other models, like the WMM, have provided evidence that these storage systems are not as simple as the MSM suggests.
• The MSM explains the transfer between STM and LTM using rehearsal. Although rehearsal plays a role in this process, other factors, such as motivation or strategic learning, may influence the transfer of information from STM to LTM and are not explained by the theory.

In what regards the strengths:

• Despite the limitations, the MSM provided a good starting point for the explanation of the structure and process of the memory system.
• The MSM was a pioneering model that inspired much research on memory.