Features of memory Flashcards
STM encoding
Acoustically
-Conrad
Conrad
ppts shown random string of consonants on screen rapidly either acoustically similair or dismiliar
higher recall of acoustically disimiliar
LTM encoding
Semantically
-Baddeley
Baddeley
ppts given different list of words: acoustic or semantic, similiar or disimiliar
20 mins later tested, semantically similiar had worse recall
STM capacity
7+/-2 digits
-Miller
Miller + Jacobs
digit span = no. digits correctly recalled 50% of time
JACOBS ppt repeat number/ letter + increase
-average number = 9.3
-average letter = 7.3
Capacity LTM
86 +/- 8 bn neurons with 10,000 connections
Unlimited capacity
Azervedo et al
Duration STM
18-28 secs
-Peterson + Peterson
Peterson + Peterson
ppt trigram + count back in threes
longer counting = worse recall
Duration of LTM
Up to a lifetime
-Bahrick et al
Bahrick et al
Ex-high school students identify old classmates
- face + name rec = 90%
- free recall = 60% after 15yrs + 30% after 48yrs
Capacity of Sensory Register
Unlimited
Duration of sensory register
250 miliseconds
Coding of sensory register
Modality specific