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Long-term memory (LTM) is the stage of the Atkinson–Shiffrin memory model in which informative knowledge is held indefinitely. It is defined in contrast to sensory memory , the initial stage, and short-term or working memory , the second stage, which persists for about 18 to 30 seconds.
At the time of the original publication there was a schism in the field of memory on the issue of a single process or dual-process model of memory, the two processes referring to short-term and long-term memory. [24] [26] Atkinson and Shiffrin cite hippocampal lesion studies as compelling evidence for a separation of the two stores. [1]
These findings suggest that iconic memory in humans has a large capacity, but decays very rapidly. [11] Another study set out to test the idea that visual sensory memory consists of coarse-grained and fine-grained memory traces using a mathematical model to quantify each.
The Atkinson–Shiffrin memory model was proposed in 1968 by Richard C. Atkinson and Richard Shiffrin. This model illustrates their theory of the human memory. These two theorists used this model to show that the human memory can be broken in to three sub-sections: Sensory Memory, short-term memory and long-term memory. [9]
In 1974, Baddeley and Hitch [5] introduced and made popular the multicomponent model of working memory.This theory proposes a central executive that, among other things, is responsible for directing attention to relevant information, suppressing irrelevant information and inappropriate actions, and for coordinating cognitive processes when more than one task must be done at the same time.
For example, short-term memory can be broken up into different units such as visual information and acoustic information. In a study by Zlonoga and Gerber (1986), patient 'KF' demonstrated certain deviations from the Atkinson–Shiffrin model. Patient KF was brain damaged, displaying difficulties regarding short-term memory. Recognition of ...
First developed by Atkinson and Shiffrin (1968), and refined by others, including Raajimakers and Shiffrin, [18] the dual-store memory search model, now referred to as SAM or search of associative memory model, remains as one of the most influential computational models of memory. The model uses both short-term memory, termed short-term store ...
Lloyd and Margaret Peterson observed that when people are given a short list of words or letters and then are distracted and occupied with another task for few seconds, their memory for the list is greatly decreased. [6] Atkinson and Shiffrin (1973) created the short-term memory model, which became the popular model for studying short-term ...