Short-Term Memory

Short-term memory (STM) is a crucial component of human cognition, allowing individuals to temporarily store and manage information necessary for various tasks. Typically, short-term memory can hold about 7 (plus or minus 2) items at a time, a concept known as Miller’s Law, which was proposed by psychologist George A. Miller in 1956.

Information in short-term memory is retained for a brief duration, usually ranging from 15 to 30 seconds, unless actively rehearsed or encoded into long-term memory. This type of memory is essential for daily activities, such as remembering phone numbers long enough to dial them or recalling a grocery list while shopping.

The process of short-term memory involves several stages. Initially, sensory information is perceived through the senses and briefly held in sensory memory. If attention is focused on certain stimuli, this information is transferred to short-term memory. Rehearsal, which can be either maintenance (repeating information) or elaborative (linking new information to existing knowledge), helps to retain information longer or move it into long-term memory.

Short-term memory is distinct from working memory, although the two terms are often used interchangeably. Working memory involves not just the temporary storage of information but also the manipulation and processing of that information for cognitive tasks. It plays a critical role in reasoning, comprehension, and learning.

Understanding short-term memory is vital in various fields, including education, psychology, and neuroscience, as it impacts how people learn and retain new information.