Test 2 Flashcards
Hindsight Bias
people feel that psychology is just “common sense” and think they knew what results would be after being told the answer
what creates data in psychological studies
Psychological research is generally done with the help of HUMAN volunteers called PARTICIPANTS who provide some sort of DATA (information) pertaining to the topic of interest. At times animals are used as substitutes for human participants
research tools to COLLECT DATA
include
observations, surveys (questionnaires), phycological tests, interviews, etc.
What do physiologists study other than behaviour
Due to their interest in the physiological mechanisms that underlie human behavior, psychologists also need tools to investigate the activity of the BRAIN
three main methods to study the brain
lesion method and electrical stimulation method
non invasive techniques
Lesion method
The lesion method involves examining brains that have suffered DAMAGE we can draw conclusions about what a damaged part of the brain does by looking at what functions are IMPAIRED after damage
Famous example of the lesion method
Phineas Gage, had a tamping rod go through his frontal lobe = was fine physically but major personality changes. led to the understanding that the frontal lobe is responsible for self regulation
Electrical stimulation
Electrical stimulation method involves stimulating a part of the brain with a mild electrical current to activate neurons we observe what the person does/ ask what the experience to verify the function of that part of the brain
famous example of the Electrical stimulation technique
case study in Montreal: epilepsy = smell of burnt toast, if we find the part of the brin linked to those two activities it can be removed
Dr. Wilder Penfield
non-invasive techniques to study the brain
EEG
FMRI
PET
EEG
ELECTROENCEPHALOGRAPHY
Uses ELECTRODES placed along the surface of the scalp to record the electrical activity produced by the firing of neurons within the brains
(measures electrical activity in the brain) can help you determine when certain brain activity occurs but can’t tell you where
FMRI
FUNCTIONAL MAGNETIC RESONANCE IMAGING monitors BLOOD and OXYGEN flow within the brain to see which regions are active being used as we do or think about various things. If a region is highly active, it will require greater amounts of blood/oxygen.
(shows what is active but is too slow to tell you when)
PET
POSITRON EMISSION TOMOGRAPHY captures images of the activity of the brain after RADIOACTIVE TRACERS have been absorbed in the bloodstream active areas will have more tracers than less active areas
Helps study the chemistry if the brain like how drugs affect the brain or detecting illnesses
Placebo
a treatment that does nothing physically (eg. sugar pill)
phychological effect: you feel better because you expect to
how do we know placebos work
the precuneus and PAA are activate in similar way to real meds
can you “manipulate” placebos
yes!
expensive placebos work better than cheap, two work better than one, a fancy pill looks better than a plain one
nocebo effect
a treatment that does nothing physically (eg. sugar pill)
phychological effect: if you think it will hurt it will
physchological experiment
in a physchological experiment, we directly MANIPULATE something we think may affect behaviour and then we carefully MEASURE the outcome to see if it did have an effect.
Dependent variable
the factor that is being MEASURED in the experiment
in the swearing experiment the dependent variable is level of pain
difficulties of the dependent variable
the dependent variable may be difficult to measure when we examine abstract concepts such as pain love or anger
how do we measure abstract concepts
scales (at least everyone is one the same scale)
questionnaires
physiological measures
operational definition
a clear and detailed definition of what we are measuring. Then we can measure it as precisely as possible
independent variable
the factor who’s effect is being examined (this is the MANIPULATED variable). we change the dependent variable on purpose to see what effect it will have on the depdnet variable
in the example: swearing vs not swearing
experimental groups
in experiments we usually create more than one group participants
we need two groups because one set of data is not enough to draw conclusions. a second set of data is needed to compare and contrast
groups are often created through random. assignment eg flipping a coin to decide which participants will be in. the experimental or control group. in other words it us left up to chance