# Digit Span Experiments

In a digit span experiment, people are given a series of digit lists to listen to. They are asked to call back each list they hear accurately and in order. The length of the lists is increased by one digit each time. For example:

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

A record is kept of the accuracy of their recall.

It is typically found that a person can recall about seven digits without making errors. As the length of the list increases, errors become more likely.

This suggests that the capacity of STM is around seven bits of information.

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