During a memory test, Diamond listens as a list of numbers is read to her. When the list is done she has to repeat the numbers from memory. Each time she correctly recalls all of the numbers, another number is added to the list. If Diamond has an average capacity of short-term storage, she should remember about (plus or minus 2) numbers before she starts making errors.
a.12
b. 7
c. 4
d. 10

B.7

Explanation:

Short Term Memory, often termed as STM, is a memory model, which was proposed by Atkinson-Shiffrin, the duration of which was said to last between 15 to 30 seconds and has a capacity of around 7 items.

Short Term Memory has three major aspects which includes:

1. Limited capacity: most adult often store between 5 and 9 items at a time.

2. Limited duration: most short term memory can be recalled between 15 and 30 seconds, which can be lost, as passage of time increases.

3. Encoding: short term memory codes the information into the brain, so as to access it quickly, such as translating visual information into sound.

This view was further reviewed by Miller in 1956 in his article titled "The Magical Number Seven, Plus or Minus Two" where he asserted that, short term memory could only hold seven (7) items, because the capacity is limited.

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