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George Miller, Psychologist: Theories on Short Term Memory, Overview

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  • 0:01 Memorizing a Series of Numbers
  • 0:49 George Miller & the…
  • 1:24 George Miller & Chunking
  • 2:57 Lesson Summary
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Lesson Transcript
Instructor: Yolanda Williams

Yolanda has taught college Psychology and Ethics, and has a doctorate of philosophy in counselor education and supervision.

George Miller was a pioneer in the field of cognitive psychology. Learn more about George Miller, his theory on short-term memory and his definition of chunking in this lesson.

Memorizing a Series of Numbers

Read the following series of numbers, then try to repeat the series out loud or write them down without looking back at the computer screen:

1, 2, 4, 8, 6, 0, 8, 4, 1, 0, 8, 1, 3, 2

How many numbers were you able to recall? If you are like most people, you remembered between five and nine of the numbers listed. The items that you remembered were stored in short-term memory. We use short-term memory to store information for 20 to 30 seconds. This is in contrast to long-term memory, which is thought to hold an infinite amount of information for extended periods of time. So, why can we only hold so little in short-term memory?

George Miller and the Magic Number Seven

The Magical Number Seven, Plus or Minus Two: Some Limits on Our Capacity for Processing Information is a well-known article written by the late psychologist George Miller in 1956. In this paper, Miller set out to measure the amount of information that can be held in short-term memory. Miller used experimental findings from several different studies to support his idea that on average, short-term memory can hold seven plus or minus two (five to nine) chunks or bits of information. So, what do we mean by chunks?

George Miller and Chunking

George Miller also distinguished between bits of information and chunks of information in his paper. A bit can be thought of as a single unit of information. For example, in the following list of numbers, each individual number is a bit of information:

2, 4, 3, 5, 9, 8, 4, 1, 0, 7, 6, 3, 2

Chunking, or taking individual units of information and combining them to form groups, is useful when storing large amounts of data in short-term memory. You probably use chunking every day without even noticing it. For example, we usually remember and write down phone numbers and social security numbers in chunks.

Suppose we separated the numbers in the example above into chunks, so that instead of trying to remember 14 individual numbers, you only had to remember six chunks of information. Now read the following numbers one-by-one, then try to repeat the numbers verbally or write them down without looking back at the screen:

24, 35, 59, 84, 107, 632

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