capacity: psychology aqa AS

Capacity of STM

the capacity of STM can be asses using a technique called "digit span".

Joseph Jacobs (1887)

used this technique to asses the capacity of STM.

• He found that the average span for digits was 9.3.
• letters was 7.3.
• Jacobs suggests that it may be because there are only 9 digits while there are 26 letters.

INCREASING…