Unit 3: Area of Study 1 - How does the Nervous System Enable Psychological Functioning? Flashcards
What is an Experiment?
Is a type of Research Method in which a Researcher tests whether a Variable influences or causes a change to another Variable under controlled conditions
What is an Independent Variable?
Is a Variable that is manipulated in order to test its effects on the Dependent Variable
What is a Dependent Variable?
Is a Variable in an Experiment the Researcher chooses to measure in order to assess the effect/s of the Independent Variable/s
What is an Extraneous Variable?
Is any variable other than the Independent Variable that can cause a change on the Dependent Variable and therefore affect the validity of the results in an unwanted way
The Aim of Research
Is the purpose of the research
Control Group
Is the group in an experiment that is not exposed to the Independent Variable (IV)
Experimental Group
Is the group in an experiment that is exposed to the Independent Variable (IV)
Operationalised Hypothesis
Is a detailed Hypothesis that is written in one sentence but gives you detailed information about the Independent Variable, the Dependent Variable, the subjects used and the direction the study is going to take
Experimental Methods
- Brain Imaging and Recording Technologies
- Case Studies
- Experiments
- Observational Studies
- Self Reports
Brain Imaging and Recording Technologies
Are scientific technologies that gain structural or functional images of an active Brain
Advantage of Brain Imaging and Recording Technologies
These technologies provide highly specific information about the Brain and its functions
Disadvantages of Brain Imaging and Recording Technologies
- These technologies are expensive to use
- The findings can be difficult to generalise to the wider population, as no 2 Brains are alike
Case Studies
Is a detailed study on a single person or a small group of people
Advantage of Case Studies
It allows researchers to gain very specific information about a particular occurrence or phenomenon
Disadvantages of Case Studies
- Case Studies can be time-consuming to undertake
- It is difficult to generalise findings from one person to the wider population
Experiments
Is when a cause and effect relationship is measured, by testing the effect of the Independent Variable (IV) on the Dependent Variable (DV)
Advantages of Experiments
- They are easy to set-up and run
- It is easy to replicate
Disadvantages of Experiments
- They are time-consuming to undertake
- Can create unrealistic situations
Observational Studies
Involves an individual observing another individual or a group of people in a natural environment, and recording observations about the behaviour they witness
Advantage of Observational Studies
They eliminate the Extraneous Variable of Artificially
Disadvantage of Observational Studies
The recordings are subject to Observer Bias, where the observer sees what they want or expect to see, which may result in a biased representation of the behaviour
Self-Reports
Is when people are asked to comment on their own thoughts, emotions and beliefs by answering a series of questions on a particular topic
Advantage of Self-Reports
Allows researchers to collect subjective data, that cannot be measured, which can gain insight into and individual
Disadvantage of Self-Reports
Difficult to compare data due to its subjective nature
Ethical Considerations in Research
- Confidentiality
- Debriefing
- Informed Consent
- Voluntary Participation
- Withdrawal Rights
Single-Blind Procedure
Is where the Participants of an experiment are not aware of the condition of the experiment to which they have been allocated and therefore the experimental treatment
Double-Blind Procedure
Is where both the Participants and the Researcher directly involved with the Participants are unaware of the conditions to which the Participants have been allocated
Sampling
Is the process of selecting Participants from a Population
Types of Sampling
- Convenience Sampling
- Random Sampling
- Stratified Sampling
- Random Stratified Sampling
Convenience Sampling
Is a quick and easy way of selecting Participants. It involves selecting Participants based on the Researcher’s accessibility to them, on their availability
Advantages of Convenience Sampling (List 2)
- It is convenient
- It does not require forward planning
- It is quick to administer
Disadvantage of Convenience Sampling
It is highly biased
Examples of Convenience Sampling (List 1)
Sampling only one class in a school
- Going to the local supermarket and surveying the people found there
Random Sampling
Is a carefully planned and systematic method selecting Participants for a study. Random Sampling ensures that every member of a Population has an equal chance of being selected for the sample being used in the study
Advantages of Random Sampling (List 2)
- Quick and inexpensive
- Not difficult to set up
- Not biased
Disadvantage of Random Sampling
May be biased
Examples of Random Sampling (List 1)
- Pulling names out of a container
- Allocating a number to each person in the Population then using a random number generator to select the Sample
Stratified Sampling
Involves breaking the Population into groups based on characteristics that they share
Advantages of Stratified Sampling (List 1)
- It should be representative of the Population
- It should be equal quantities of particular characteristics
Disadvantage of Stratified Sampling
It is time-consuming to undertake
Example of Stratified Sampling
If there are more boys than girls in a school, a Stratified Sample of this Population would also include more boys than girls
Random Stratified Sampling
Involves breaking the Population into groups and then selecting the Sample from each group randomly
Advantage of Random Stratified Sampling
It obtains a Representative Sample that is free from bias
Disadvantage of Random Stratified Sampling
It is time-consuming to undertake
Types of Research Designs
- Independent Groups Design
- Matched Participants Design
- Repeated Measures Design
Independent Groups Design
Is when each participant is randomly allocated to one of two (or more) entirely separate group conditions