Memory Flashcards
What is meant by duration of memory?
The length of time info can be stored in the memory.
What is meant by capacity of memory?
The amount of info that can be stored in the memory.
What is meant by coding of memory?
Sensory info is modified and stored in the brain.
What are the different types of memory store?
Sensory register
Short term memory
Long term memory
What is the capacity of sensory memory?
SS has a large capacity
What is the capacity of STM?
Limited capacity
What is the capacity of LTM?
Unlimited capacity
How is STM often assessed?
STM is measured using a digit span task.
What did Jacob’s research find on capacity?
He found the average span for numbers to be 9.3 items. For letters it was 7.3 items.
What did Miller’s research find on capacity?
The ‘magic number’ was 7 +/- 2 items. We are good at remembering 5-9 items.
What did Miller suggest about chunking?
He argued that our capacity for remembering info can be increased if we chunk items together. If we find links between things and group them together we will remember more.
What is the duration of memory in the sensory store?
Less than a second
What is the duration of STM?
18-30 seconds
What is the duration of LTM?
Potentially lasts forever
What was the procedure of Peterson and Peterson?
Each of 8 trials- Ppts given a constant trigram and a 3 digit number. Asked to recall the consonant syllables after intervals of 3 6 9 12 15 18 seconds. To prevent rehearsal, Ppts asked to count back from their 3 digit number.
What were the findings of Peterson and Peterson?
3 secs= 80% successful recall
9 secs= 20% successful recall
Duration of STM= less than 18 secs
Duration of LTM= 48 years
What was the procedure of Bahrick et al?
Tested photo recognition and free name recall from Ppts high school yearbooks. 392 Ppts from 17-74 years.
What were the findings of bahrick et al?
Ppts tested in 15 years after graduation were 90% accurate. After 48 years= 70% accurate
Free recall: after 15 years, 60% accurate
After 48 years= 30% accurate
How is info encoded in the SS?
Modality specific
How is info encoded in the STM?
Acoustically