Memory Studies Flashcards
Conrad Aim
STM coding
Conrad Setting
Lab
Conrad Procedure
Acoustically similar and dissimilar lists of letters
Told to learn letter sequences e.g. PCTVDB
Acoustic confusion task
Conrad Findings
Most people made more mistakes on acoustically similar letters
Conrad Conclusion
STM codes acoustically
Conrad Evaluation
Artificial task, decreases ecological validity
Conrad Evaluation- research support
Baddeley- increases reliability
Baddeley STM Aim
Effects of acoustic and semantic encoding in stm
Baddeley STM Setting
Lab
Baddeley STM Procedure
4 groups
List of 5 words: acoustically similar/ dissimilar, semantically similar/ dissimilar
Asked to recall in correct order
Repeated x4
Baddeley STM Findings
Acoustically similar = 55% accuracy, dissimilar = 75% accuracy
Semantics only a slight difference
Baddeley STM Conclusion
Support Conrad- STM is acoustically coded
Baddeley STM Evaluation
Artificial task, decreases ecological validity
Cannot explain how pictures or facts are learnt- decreases internal validity
Baddeley STM Evaluation- research support
Supported by Conrad- increases reliability
Baddeley LTM Aim
Effects of acoustic and semantic coding in LTM
Baddeley LTM Setting
Lab
Baddeley LTM Procedure
Same as STM but 10 words and interval of 20 mins where they did a different task
Baddeley LTM Findings
Recall worse for semantically similar= 55%, dissimilar= 85% accuracy, same for acoustic
Baddeley LTM Conclusion
LTM primarily coded semantically
Baddeley LTM Evaluation
Artificial task, decreases ecological validity
Cannot explain how pictures or facts are learnt- decreases internal validity
Jacobs Aim
STM capacity
Jacobs Setting
Lab
Jacobs Procedure
Serial digit span test
Recall in order
Fail on 50% of words (cannot recall order)- reached capacity
Jacobs Findings
Mean span for digits was 9.3 items, letters was 7.3
Jacobs Conclusion
STM capacity limited to 7-9 items
Jacobs Evalution
Artificial task, decreases ecological validity
Easy to replicate, increases reliability
Standing Aim
Capacity of LTM
Standing Setting
Lab
Standing Procedure
Presented with 2,560 pictures over a number of days
Shown for 10 seconds each
Tested by showing old one and new one- which one had they seen before?
Standing Findings
90% recognised if there was a new picture that wasn’t originally shown
Standing Conclusion
Almost unlimited capacity of LTM
Standing Evaluation
Artificial task, decreases ecological validity
Peterson and Peterson Aim
Duration of STM
Peterson and Peterson Setting
Lab
Peterson and Peterson Procedure
Isolated STM
Trigram e.g. wct
No rehearsal- given a 3 digit number and asked to count down from it
On each trial given increasingly longer amount of time to count
Recall trigram after
Peterson and Peterson Findings
76% correct at 3 secs, 10% at 18 secs
90% recall at 3 secs
Peterson and Peterson Conclusion
STM has a short duration unless rehearsed, sensitive to interference
Peterson and Peterson Evaluation
Artificial task, decreases ecological validity
Standardised, increases internal validity
Alternative explanation, displacement, decreases internal validity
Bahrick Aim
Duration of LTM
Bahrick Setting and Sample
Lab, 392 graduates who all went to same high school in America, span of 50 years
Bahrick Procedure
Shown photos from yearbook
Recognition group: list of names to match photos to
Recall group: name without cue
Bahrick Findings
Recognition 15 years- 90%
Recognition 48 years- 60%
Recall 15 years- 60%
Recall 48 years- 30%
Bahrick Conclusion
LTM lifetime duration, better in recognition tests
Bahrick Evaluation
Meaningful stimulus, increases external validity
May have looked at yearbook- confounding variables- decreases internal validity
Worse memory with old ages?- internal validity
Clive Wearing
Viral infection damaged brain and hippocampus Severe amnesia Can’t transfer from stm to ltm Still understands world Shows separate memory store
HM
Hippocampus removed to prevent epilepsy
Severe memory loss
Unable to learn new memories, still knew old memories
CW Evaluation
Not sure of exact damage, decreases internal validity
HM Evaluation
Know exact damage- increases internal validity
Can’t repeat, decreases reliability
Tulving Aim
Different types of LTM
Tulving Setting
Lab
Tulving Procedure
Perform various memory tasks while brains were scanned- PET scanner
Tulving Findings
Episodic and procedural from prefrontal cortex- left= semantic. Right= episodic
Tulving Conclusion
Supports view that there are different types of LTM
Tulving Evaluation
Artificial task, decreases ecological validity
Tulving Evaluation- research support
HM and Clive Wearing, increases reliability
Atkinson and Shiffrin
Sensory Memory - Attention - STM - Rehearsal - LTM - Retrieval - STM - Recall
Atkinson and Shiffrin Evaluation- research support
Capacity of LTM- Wagenaar/Standing, increases reliability
Atkinson and Shiffrin Evaluation- research conflict
Unitary LTM store- Tulivng, decreases reliability
Atkinson and Shiffrin Evaluation
Most research to support uses artificial tasks, decreases ecological validity
Baddeley and Hitch
STM model Central executive Episodic buffer Visuospatial sketchpad Phonological loop Task duality
Baddeley and Hitch Evaluation- research support
Different systems-Shallice and Warrington 1970: patient KF had brain damage, poor STM ability but good visual, increases reliability
Baddeley and Hitch Evaluation- research support
Braver 1998: tasks for central executive whilst having brain scan, activity increased, increases reliability
Baddeley and Hitch Evaluation- research support
Baddeley 1975: visuo-spatial sketch-pad, track light and class angles in letter F at same time, increases reliability
Baddeley and Hitch Evaluation
Little known about central executive- unfalsifiable, decreases internal validity
Doesn’t mention smell or taste, decreases internal validity
Artificial tasks supporting, decreases ecological validity
Henk Schmidt Aim
Assess influence of retroactive interference on memory
Henk Schmidt Setting and Sample
Lab, 211 participants ranging from 11 to 79 years
Henk Schmidt Procedure
700 names randomly selected from database of school student at Dutch elementary school
Given map of Molenberg where they went to school, road names replaced with numbers
Questionnaire collected other details e.g. how many times they have moved house
Amount of retroactive influence assessed by how many times moved house
Henk Schmidt Findings
Positive association between number times moved and accuracy of names
Henk Schmidt Conclusion
Supports retroactive interference as explanation of forgetting
McGeoch and McDonald Aim
Test whether interference was worse when memories were similar
McGeoch and McDonald Setting
Lab
McGeoch and McDonald Procedure
Leant 10 words until 100% recall
Learnt new set of words and had to recall original list
McGeoch and McDonald Findings
Types of interference- synonyms= lowest recall
Antonyms= 2nd lowest
No relationship= highest recall
McGeoch and McDonald Conclusion
Interference strongest when memories are similar
McGeoch and McDonald Evaluation
Artificial tasks, decreases ecological validity
Standardised, increases internal validity
Godden and Baddeley Aim
Prove context dependent forgetting
Godden and Baddeley Setting
Field
Godden and Baddeley Procedure
Divers learnt words underwater or on land
Recall underwater or on land
Learn on land/ recall on land, learnt underwater/ recall underwater, learn on land/ recall underwater, learn underwater/ recall on land
Godden and Baddeley Findings
40% lower accuracy in non-matching conditions
Godden and Baddeley Conclusion
Lack of external cues leads to retrieval failure
Carter and Cassidy Aim
Investigate state dependent forgetting
Carter and Cassidy Setting
Lab
Carter and Cassidy Procedure
Gave anti-histamine drugs- slight sedative effect
Creates different internal and psychological state
Learn lists of words/ prose and recall
Learn on drug/ recall off drug, learn off/ recall on, learn on/ recall on, learn off/ recall off
Carter and Cassidy Findings
Recall worse when mismatch between internal state of learning and recall
Carter and Cassidy Conclusion
Lack of internal cues leads to retrieval failure
Loftus and Palmer Aim
Do leading questions distort EWTs?
Loftus and Palmer Setting
Lab
Loftus and Palmer Procedure
Showed film of car crash
5 conditions- how fast were they going when the cars…? Hit/ smashed/ collided/ bumped/ contacted
Loftus and Palmer Findings
Smashed said 40.8mph
Contacted said 31.8mph
Loftus and Palmer Conclusion
Word altered memory
Loftus and Palmer Variation
One week later asked if had seen broken glass (there was none)
Loftus and Palmer Variation Findings
Said smashed- 32% said there was glass
Said hit- 14% said there was glass
Loftus and Palmer Variation Conclusion
Changing word distorts memory
Loftus and Palmer Variation Evaluation
Controlled setting, increases internal validity
Artificial task, decreases ecological validity
Gabbert Aim
How post-event discussion affects memory
Gabbert Setting
Lab
Gabbert Procedure
Watched a video of same crime from different angles
Then discussed with other participants what they had seen
Individually completed recall test
Gabbert Findings
71% mistakenly recalled aspects that were brought up in discussion, but hadn’t seen in video
Control group- 0% mistakenly recalled aspects
Gabbert Conclusion
Memory conformity
Gabbert Evaluation
Controlled setting, increases internal validity
Artificial task, decreases ecological validity
Johnson and Scott Aim
Investigate effect of weapons on accuracy of EWTs
Johnson and Scott Setting
Field
Johnson and Scott Procedure
Condition 1: participants in waiting room, heard argument, man walked though holding pen and had grease on his hands
Condition 2 : participants hears argument with glass smashing, man walked through with paper knife covered in blood
Asked to pick out man from a selection of 50 photos
Johnson and Scott Findings
49% in condition 1 were accurate
33% accuracy in condition 2
Johnson and Scott Conculsion
Anxiety has a negative effect on recall
Johnson and Scott Evaluation
Natural setting, decreased demand characteristics, increases internal validity
No consent / psychological harm, decreases reliability
Yuille and Cutshall Aim
Effect of anxiety of EWT accuracy
Yuille and Cutshall Setting and Sample
Natural, 21 witnesses- 13 took part
Yuille and Cutshall Procedure
Gun shop, Vancouver Canada
Shop owner shot a thief dead
Interview held 4-5 months after/ compared to police interviews
Rate stress using 7-point scale
Yuille and Cutshall Findings
Very accurate, most accurate in high stress- 85%, 75% for low stress
Yuille and Cutshall Conclusion
Anxiety has a positive effect on recall
Yuille and Cutshall Evaluation
No demand characteristics, increases internal validity
Ethical issues, decreases reliability