Memory Study Guide

The Multi-Store Model of Memory, proposed by Atkinson and Shiffrin in 1968, describes memory as a flow of information through three distinct stores: the sensory register, short-term memory (STM), and long-term memory (LTM). Information from the five senses initially enters the sensory register, which has a very large capacity but a duration of only a fraction of a second to a few seconds. If attention is paid to this sensory information, it is transferred to short-term memory. STM has a limited capacity, typically holding about 7 +/- 2 items, and a limited duration of approximately 18-30 seconds without rehearsal. To keep information in STM for longer or to pass it into LTM, maintenance rehearsal (repetition) is required. LTM has an essentially unlimited capacity and duration, and information stored here can be retrieved back into STM when needed. The model suggests that forgetting can occur at any stage: information in the sensory register decays rapidly if not attended to, information in STM is lost through decay (time) or displacement (new information replaces old), and information in LTM can be difficult to retrieve if the correct cues are not available, or it may simply decay over very long periods. The MSM has been influential in psychology, providing a framework for understanding memory processes, even though later research has proposed more complex models.

Memory is a complex cognitive process involving the encoding, storage, and retrieval of information. Psychologists use information processing models to describe how this occurs, often comparing the mind to a computer system. The Atkinson-Shiffrin Multi-Store Model (MSM), for example, proposes three distinct memory stores: sensory memory, short-term memory (STM), and long-term memory (LTM). Sensory memory briefly holds information from our senses, like sights or sounds, for a fraction of a second. If attention is paid, this information moves to STM, which has a limited capacity (around 7 +/- 2 items) and duration (about 18-30 seconds). Rehearsal, repeating information, helps maintain it in STM and can transfer it to LTM. LTM has potentially unlimited capacity and duration. However, even with LTM, forgetting can occur due to various reasons, such as decay (information fading over time if not accessed), displacement (new information pushing out old in STM), retrieval failure (inability to access stored information, even if present), or interference (new and old memories clashing). Brain structures play crucial roles in these processes. The hippocampus, for instance, is vital for forming new long-term explicit memories, while the amygdala is involved in emotional memories. Different areas of the cerebral cortex store various types of long-term memories, like factual knowledge or skills. Damage to these areas can severally impair memory function, leading to conditions like amnesia, highlighting the biological basis of memory.