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Sensation and Perception: Research methods
Terms in this set (23)
Single cell recording is...
the electric impulse/signals from a single nueron detected by a single electrode that is implanted in the brain
who is single-cell recording used on?
NOT humans because it is too invasive and dangerous.
PET stands for
positive emission tomography
RE PET: it measures what?
blood flow in the brain. More activity means more blood.
RE PET: what makes the blood traceable?
a substance is injected that has a radioactive tag
RE PET: what are the limitations?
radioactivity, limited temporal resolution, poor spatial resolution
fMRI stands for what
functional Magnetic resonance imaging
RE fMRI: what does it measure?
measures oxygen levels in blood in brain. more activity means more oxygen needed
DOT stands for what?
Diffuse optical tomography
RE DOT: measures what?
measures oxygen levels in the blood in the brain by detecting changes in the light reflected by the brain.
RE DOT: how does it work?
light is projected through the skull and reflected through the brain
RE DOT: pros and cons?
temporal resolution is as good as fMRI and it is portable. But spatial resolution is a little poorer.
definition of psychophysics
studying relation between physical energy in a stimulus and the perceptual experience that it produces
definition of ABSOLUTE threshold
the minimum intensity of stimulation required to produce a sensation
definition of DIFFERENCE threshold
the minimum difference in intensity between two stimuli that can be detected.
Difference threshold is also known as...
just noticeable difference
who was the father of new psychology using psychophysical science?
RE absolute threshold methods: what is the method of limits?
1. present an orderly series of stimulus intensities
2. at each presentation, ask participant if they detected it
3. the threshold is the midpoint between intensities where the subject's response changed
4. repeated ascending and descending, staggering starting points
5. average of thresholds is taken
RE absolute threshold methods: what are some limitations of the method of limits? (2)
1. error of habituation or preservation. subject tends to keep reporting that they detect the stimulus. solved by presenting stimulus in ascending and descending order
2. participants recognize a pattern in responses, Solution is to stagger starting points
RE absolute threshold methods: what is the method of adjustment?
same as the method of limits, except the subject of the experiment continuously adjusts the stimulus
RE absolute threshold methods: what is the method of constant stimuli?
1. used a fixed stimulus intensity selected in advance
2. present stimulus intensities in a RANDOM order and compare them to the standard
3. present each intensity several times, each time asking for a yes or no from subject
what is another name for a "psychophysical function"?
at what "percentage" on a psychometric function is the absolute threshold?
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