The Nature and Structure of Memory
- Created by: emilyisblue
- Created on: 12-04-15 16:47
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- THE NATURE AND STRUCTURE OF MEMORY
- Long Term
- Duration
- Refers to memories that last from 2 hours to 100 years.
- Bahrick
- 1. 400 participants aged 17-74.
- 2. Photo recognitoin or free recall of their year book and classmates.
- 3. Those within 15 yrs of graduation had 90% accuracy on photo recognition and 60% accuracy on free recall.
- 4. Those within 45 yrs of graduation had 70% accuracy on photo recognition and 30% on free recall.
- Shepard
- 1. Showed participants 612 memorable pictures.
- 2. An hour later participants were shown the pictures among other photos.
- 3. They showed almost perfect recognition.
- 4. Four months later they could still recall 50% of the photos.
- The photos were more memorable therefore had a longer duration.
- Capacity and Duration potentially unlimited.
- Duration
- Short Term
- Duration
- Evidence Suggests Memories Don't Last Long.
- Like a note pad where ink fades.
- Things remembered by repetition but then fade.
- Rehearsal Keeps memories active.
- Peterson And Peterson
- 2. During the retention interval they counted backward in threes from a random number.
- 3. Recall was 90% accurate at 3 seconds and 2% accurate at 18 seconds.
- 1. Participants told to recall nonsense syllables after a retention period of 3-18 seconds.
- Evidence Suggests Memories Don't Last Long.
- Capacity
- Miller
- 1. 7+/- 2 items of chunks.
- 3. Also found we can remember 5 words as easy as 5 letters.
- 4. We chunk things together to remember more.
- 2. Found this out from reviewing studies.
- - such as the amount of dots someone can remember being flashed on a screen.
- Simon
- 2. Large chunks such as 8-word phrases and small chunks such as one syllable words.
- 1. Found people had a shorter memory span for larger chunks.
- Jacobs
- 1. Used the digit span technique to asses the capacity of STM.
- 2. Found 9.3 for digits and 7.3 for letters.
- Miller
- Encoding
- Baddely
- 1.Gave participants a list of words which were acoustically similar and semantically similar.
- 2. Found it hard to recall acoustically similar words in the STM.
- 3. Semantically similar words were muddled in the LTM but not STM.
- 4. Suggested we encode accoustically in the STM and semantically in the LTM.
- Acoustic: Codes information in the way it sounds.
- Semantic: Codes information from it's meaning.
- Baddely
- Duration
- Evaluation
- Duration
- P&P
- Study lacked internal validity as the syllables could have been displaced rather than forgotten.
- Demand characteristics + people could cheat as it was obvious they were testing memory.
- Narne: Found items could be recalled after 96 scns.
- A study found that items could only be remembered for 2 scns without warning.
- P&P
- Capacity
- Cowan found that STM is more likely to be limited to 4 chunks.
- Vogel also concluded this.
- Cowan found that STM is more likely to be limited to 4 chunks.
- Encoding
- Brandimote
- 3. Used an articulary suppression task.
- 1. Found STM had visual encoding.
- 2. Asked participants to recall fragments of photos.
- Frost has shown long term recall was also visual.
- Brandimote
- Duration
- Long Term
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