evaluation -capacity

Question 1

one strength of jacob’s study

Answer 1

it had been replicated
this old study may have lacked adequate controls (e.g confounding variables -pps getting distracted )
despite this jacob’s findings later confirmed in controlled studies - Bopp and Vergaeghen 2005
study has internal validity -valid measure of STM digit span

Question 2

one limitation of millers research

Answer 2

research may overestimate STM capacity
e.g Cowan 2001 reviewed other research
concluded that the capacity of STM was only about 4 (+ or - 1)chunks
suggests the the lower end of Millers estimate (5 items) is more appropriate than 7 items