The Magical Number Seven, Plus or Minus Two
Based on a 1956 review of memory research, psychologist George Miller concluded that the capacity of short-term memory is limited to approximately seven items, plus or minus two. This range, from 5 to 9 items, is often referred to as the 'magic number' in psychology.
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Ch.8 Memory - Psychology @ OpenStax
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OpenStax Psychology (2nd ed.) Textbook
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Factors Affecting Short-Term Memory Retention
A friend quickly recites a list of 12 grocery items for you to remember. Without writing them down, you walk to the store. A minute later, you find you can only recall about 6 or 7 of the items. Which of the following best explains this common memory failure?