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Introduction to Research Methods
Psychologists try to explain human behaviour. They do
this by conducting research.
How is research conducted?
You might decide to investigate genderroles, and ask why do men and womenbehave like they do? Are humans born
withcertain behaviours (nature) or do they
learnthem? (nurture)
Your Task
In small groups brainstorm how youthink psychologistscould investigatethis. You have fiveminutes and we willfeed back to thegroup.
Experiments
An experiment is a way of conducting research inwhich one or more variables are manipulated.
You will have conducted experiments in GSCEscience. For example you might have grown one
batchof plants with light and one without and comparedthe difference.
These differences are known as variables.
Experiments
In psychology there are differenttypes of experiments that you canconduct. For example:• Lab experiments• Field experiments • Natural experiments
Experiments
What not to do
Lab experiments
An experiment thattakes place in acontrolledenvironment wherethe independent variable (IV) ismanipulated.
Natural experiments
The researcher takesadvantage of a naturallyoccurring differences.The IV(s) occur naturallyrather than beingmanipulated by theresearcher. For exampledoes the introduction oftelevision lead to morecases of eatingdisorders?
Field experiments (no not really in a field!)
An experiment thattakes place in anatural environment;the IV ismanipulated. For
exampleyou might want to see ifpeople are likely to helpon a busy train.
Your Task
You must: In small groups, read the experiments onthe sheet and decide if they are lab experiments,field experiments or natural experiments.
You should: Give reasons explaining how you arrive at
your decision.
You could: List problems you think might occur ineach experiment.
Pilot Study
A smaller version of a
larger study that isconducted to
preparefor that study and‘iron out’ anyproblems.
Your Task
In small groups make a table and see if
you can think of advantages &disadvantages for the types ofexperiment.
Lab Experiment -Advantages
High level of control of both the IVand Ev’s.
The IV (independent variable is the variable you manipulate orchange).
The EV’s (extraneous variables) are any other variable that may
impact on your research.
Lab Experiment -Advantages
Replicable - Because lab experiments
are so highly controlled, it is easy toreplicate them, that is to copy themexactly and do them again.
Lab Experiment - Disadvantages
Artificial - The tasks in a labexperiment can sometimes seem veryartificial and not reflect real life. Thisis known as mundane realism.
Mundane realism is a criticism you can usefor A02 comments.
Lab Experiment Disadvantages
There is a high chance of the investigator influencing the way
the participant behaves.
This is know as demand characteristics.
There are many types of demand characteristics. The two you
need to know are:• The Hawthorn Effect• Evaluation Apprehension
The Hawthorn Effect
Imagine you are being timed to see howfast you can run round a track. Normally youmight take your time running, but if you arebeing watched, you might try and run faster,to impress the person watching you.
In psychology experiments, sometimesparticipants try to improve theirperformance to please the experimenter.
Evaluation Apprehension
Imagine you are doing
your driving test.Normally you mightdrive as well as LewisHamilton but as soonas you start yourdriving test youdrive like this.
Field Experiment Advantages
A reduction of demand characteristics.
Can be seen as having higher mundane
realism than a lab experiment.
Field Experiment Disadvantages
Less control over variables than a lab
experiment.
Can be more time consuming than a lab
experiment.
Natural Experiment Advantages
Can be very useful in situations whereyou can not manipulate the
independentvariable. For example, if you want tosee if the media has an impact oneating disorders.
Very high mundane realism.
Natural Experiment Disadvantages
Problems with internal validity - manyextraneous variables might impact onyour research so concluding cause andeffect can be difficult.
You can not allocate participants togroups.
Participants
The people who take part in yourresearch are called participants. Insome older books they might be calledsubjects.
You have an obligation to ensure yourparticipants are not caused distress orharmed.
Confederates/Stooges
Sometimes in psychological research,the experimenter gets people to playcertain roles in the experiment. Thesepeople are a part of the experimentand are called confederates orstooges.
Key Words
Lab experimentField experimentNatural experimentVariablesIndependent variableDependent variablePilot studyExtraneous variableReplicableMundane realismConfederate/stoogesHawthorn effectEvaluation apprehension
Copy and define these keywords for your dictionarysection.