Coding, capacity, duration Flashcards
what is capacity
how much we can hold in memory
what is coding
how information is stored in memory
what is duration
how long the memory lasts
what is memory
process in which we retain info about past events
what is STM
STM is when the memory of info is held for a short period of time
what is LTM
LTM is memory that is held infinitely (permanent)
capacity of STM
7 plus or minus 2 items
capacity of LTM
unlimited
Duration of STM
18-30 seconds
Duration of LTM
unlimited
Coding of STM
acoustically (by sound)
coding of LTM
semantically (by meaning)
Peterson and Peterson
-to find out duration of STM
- trigrams study
- had intervals when counting backwards for certain time period (prevents reversal)
- asked to recall trigrams after 3,6,9,12,14,16,18 seconds
- longer the interval= decreased recall levels
- shows that there’s a limited duration in STM
Bahrick
-to find out duration and capacity of LTM
- yearbook names and photos study of 50
- 392 ohio citizens
- asked to recall after 15/48 years.
-photos 15=90% recall 48= 70% recall
name 15= 90% recall 48= 80% recall
shows that LTM has unlimited duration as recall remained fairly accurate
Jacobs
- to find capacity of STM
-used his own students as Ps
-DIGIT SPAN
-repeating string of numbers that got larger
-Ps could recall 9.3 digits/7.3 letters on average
supported by miller 7plus minus 2 items
