Cognitive Psychology- Loftus and Palmer and Grant Flashcards
What is the cognitive approach
Cognitive psychologists believe behavior is a result of information processing. Internal mental processes such as memory, thinking, language etc. are important features influencing behavior
The human mind works like a computer, it inputs information and then we actively process the information around us through our experiences and interactions and decide on the appropriate output
What is the background of Loftus and Palmer
Memory is the term given to the structures and processes involved in the storage and retrieval of information. Bartlett (1932) suggested that memory is influenced by what an individual already knows using their past experiences to deal with a new experience known as schemas. Reconstructive memory involves interpreting what is seen or heard but this can be distorted in two ways. Firstly, our expectations of what we should anticipate would have happened and post-event information such as how we are asked to recall information. All of this is important to know when we consider eyewitness testimony as the memory of an event can be easily influenced yet juries are often convinced by an eyewitness testimony. This lead Loftus and Palmer to investigate how reliable they are and how memory can be impacted by leading questions
What is the aim of Loftus and Palmer
To investigate the effects of leading questions on an individuals ability to accurately recall events
What was the research method used in Loftus and Palmer
Both experiments were lab experiments using independent measures designs and were conducted in a highly controlled environment
What was the sample used in Loftus and Palmer for experiment 1?
45 of Loftus’ students from Washington University divided into 5 groups (one group from each verb) with 9 participants in each group
What was the independent variable in Loftus and Palmer
The wording of a critical question hidden in a questionnaire
What was the dependent variable in Loftus and Palmer
The estimated speed in MPH given by the participants
What was the procedure for Loftus and Palmer
The students were split into 5 groups of 9
They all watched the same 7 film clips of different traffic accidents alone in a room
Following each clip the participants were given a questionnaire of the same set of questions asking them to recall the accidents
However a critical question was included in a questionnaire that asked the participants “About how fast were the cars going when they… into each other?”
The critical question was manipulated into 5 conditions with 5 different verbs- smashed, hit, collided, contacted, bumped
Their estimated speed was recorded in MPH
What were the controls used in experiment 1 in Loftus and Palmer
Same 7 film clips of traffic accidents
Same questionnaire with the exception of the critical verb
Why was it important that all participants watched exactly the same films
To ensure a control in the experiment so Loftus and Palmer can be sure it was due to the verb that effected speed estimates not the film
Why would they embed the critical question with others rather than just ask them on being analysed
The other questions were a distractor to ensure students did not guess the aim of the study and respond with demand characteristics
What were the results for experiment 1 of Loftus and Palmer
Smashed- 40.5 MPH
Collided- 39.3 MPH
Bumped- 38.1 MPH
Hit- 34.0 MPH
Contacted- 31.8 MPH
What were the overall conclusions of Loftus and Palmer in experiment 1
The verb used in a question influences a participants response like the way a question is phrased influences the answer given
People are not very good at judging vehicular speed
Why did Loftus and Palmer do experiment 2?
Response bias- It is difficult to estimate speed accurately so a more serious sounding verb simply makes people estimate higher as the participant may have been unsure whether to say 30 MPH or 40 MPH so the verb smashed biased their response
Changes in memory- More serious sounding verbs caused people to really believe they did witness the cars travelling faster
What was the sample used in experiment 2 in Loftus and Palmer
150 different students from Washington University were divided into 3 groups with 50 participants in each group
What was the procedure of experiment 2
Split into 3 groups of 50
Watch one short clip of an accident
Asked to complete a questionnaire with a critical question
One group - Smashed question
Other group- Hit question
Control group- werent asked about the speed
What would happen one week later for experiment 2
All the participants came back and without watching the film again they were asked 10 questions about the film.
Embedded in the new series of questions there was a critical question that appeared in a random order in the questions that all participants were asked
What was the critical question in experiment 2
“Did you see any broken glass?”
Why was there the critical question asked in experiment 2
To see if false memory could be implanted in their cognitive processing to see evidence for reconstructive memory
What was the independent and dependent variable in experiment 2
IV- Verb used when asked about the speed (smashed vs hit)
DV- reporting of any broken glass by participants one week later
What were the results of experiment 2
Response - Yes- Smashed- 16 Hit-7 Control- 6
Response- No Smashed- 34 Hit-43 Control-44
What were the conclusions of experiment 2
Misleading post event information can distort an individuals memory
The participants saw the film and and some memories were created from this. The leading question provided after however information that there has been a “smash”. We associate “smash” with being broken and so expect broken glass to be present so participants add to their memory and recall seeing broken glass
What were the overall conclusions of Loftus and Palmer
Memories are constructed from 2 sources of information - what we actually perceive is happening at the time AND the information later received and incorporated into our memories
Information from the 2 sources will integrate over time and we will be unable to decipher which source the information comes from
We are therefore unable to tell whether our memory is accurate
Therefore overall it is safe to say that eyewitness accounts of events may not be reliable sources of information especially when leading questions are used
What are the strengths of the research method in Loftus and Palmer
2 lab experiments with high levels of control over extraneous variables as all participants had the same questions-and watched the same clips for the same lengths of time
So extraneous variables are controlled so they did not become confounding and cause and effect could be established between leading questions and eye witness testimony accuracy
What are the weaknesses of the research method in Loftus and Palmer
Lab experiments have low ecological validity due to the artificial environment
The participants were all in a room together watching 7 different clips of car accidents and answering a questionnaire after each one
In real life a person would be at the scene of the crime and have the emotional arousal therefore lab experiments are hard to generalize in real life
What are the strengths of the type of data in Loftus and Palmer
Quant data- MPH estimates and number of participants who reported seeing broken glass in exp 2 so it is easier to replicate increasing the external reliability of the study
Also easy to analyze and compare between groups increasing the internal validity of the study as the data is therefore objective and unbiased so more scientific
What are the weaknesses of the type of data in Loftus and Palmer
Quantitative data does not provide reasons behind behavior so internal validity is decreased
What are the strengths of the sample used in Loftus and Palmer
In experiment 2 they used a larger sample of students of 150 so it was less biased
Used both males and females
From university so more likely to be a space with more culture
What are the weaknesses of the sample used in Loftus and Palmer
Small sample in experiment 1 and only 45 so small sample
All are students so not a diverse age range and may be more obedient
Participants in experiment 1 are all Loftus students so all hold similar charecteristics
What are the strengths of the internal validity used in Loftus and Palmer
Controls over extraneous variables are implemented for example all participants watch the same 7 clips of car accidents all lasting between 5 and 30 seconds and all answered the same questionnaire with the only difference being the critical question
Allows Loftus to establish a cause and effect relationship between the strength of the leading verb and the eye witness testimony accuracy
What are the weaknesses of the internal validity used in Loftus and Palmer
Independent measures design was used so participants were not matched upon any personal characteristics
Therefore don’t know the previous driving experience of any of the participants
Therefore means that Loftus may have not measured the impact of the verb in a leading question as other factors may reduce the validity
Low ecological
Low population
What are the strengths of the reliability used in Loftus and Palmer
A standardised procedure is used where all participants watched the same 7 clips with the same questionnaire at the same time
This makes the study easier to replicate which therefore increases the internal reliability
What are the weaknesses of the reliability used in Loftus and Palmer
At the start of the questionnaire the participants had to give an account of what they saw therefore qualitative data was gathered
This would be difficult to replicate therefore would make it slightly low in external reliability
This means there will be less consistency of results and limits the usefulness of the study as it limits the support of theories
How was Loftus and Palmer ethical
Right to withdraw