STM and LTM Flashcards
capacity of STM
magic 7 plus/minus 2
Duration of STM
18 - 30 secs peterson and peterson
Encoding of STM
acoustic (sound) Braddley
Capacity of LTM
unlimited
Duration of LTM
unlimited bahrick
Encoding of LTM
Semantic
definition of STM
a memory of events in the present or in the immediate past
Definition of LTM
an event that happened in the distance past
Evaluation of LTM
Evaluation of STM
- Cowans (2001) had done studies on Capacity of STM and concluded STM is likely to be limited to 4 chunks
- Jacob found that recall ( digit span) increased steadily with age as research shows 8 year olds - 6.6 digit and 19 year old - 8.6
- testing STM is artificial as trying to memorise constant syllables does not truely reflect most everyday memory activities where what we are trying to remember is meaningful
the study of duration of STM
peterson and peterson
studies using 24 students
each participant was studied over 8 trials
on each trial, participant was given a constant syllables and a 3 digit number
they were asked to recall the constant syllables after a retention interval of 3, 6, 9, 12, 15 or 18 seconds
findings of the duration of STM
90% got it correct over 3 secs
20% correct after 5 seconds
2% after 18 seconds
study of the duration of LTM
Bahrick et al tested 700 people of various ages from 17 to 74 years old
a photo recognition test considered of 50 photos, some from the high school year book
- 90% accurate were ppl who were tested with 15 years of graduation
- 70% after 48 years old
- 60% after 15 years
- 30% after 48 years
types of LTM
eposidic, semantic and procedural memory
procedural memory
remembering an action
procedural are typically aquired by repetition and practise
