NOVA PSYCHOLOGY 200 EXAM 2 QUESTIONS AND ANSWERS 100% CORRECT!
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Course
NOVA PSYCHOLOGY 200
Institution
NOVA PSYCHOLOGY 200
psychophysics - ANSWER methods that measure strength of stimulus/observer's sensitivity to stimulus
absolute threshold - ANSWER minimal intensity that is needed to just barely detect a stimulus in 50% of trials
just noticeable difference - ANSWER minimal change in a stimulus that can just bar...
,NOVA PSYCHOLOGY 200 EXAM 2
QUESTIONS AND ANSWERS 100%
CORRECT!
sensation - ANSWER stimulation of a sense organ
perception - ANSWER interpretation of a sensation to form a mental representation
transduction - ANSWER when many sensors in the body convert physical signals
(vision = light; hearing = vibrations; touch = pressure; taste & smell = molecules in the
air/saliva)
psychophysics - ANSWER methods that measure strength of stimulus/observer's
sensitivity to stimulus
absolute threshold - ANSWER minimal intensity that is needed to just barely detect a
stimulus in 50% of trials
just noticeable difference - ANSWER minimal change in a stimulus that can just barely
be detected
Weber's Law - ANSWER the just noticeable difference of a stimulus is a constant
proportion despite variations in intensity
signal detection theory - ANSWER response to stimulus depends on both a person's
sensitivity to stimulus in the presence of noise and on a person's response criterion
sensory adaptation - ANSWER sensitivity to prolonged stimulation tends to decline over
time as an organism adapts to current conditions [NOSE BLINDNESS/CONCERTS
GET LESS LOUD]
three properties of light waves - ANSWER length, amplitude, purity
what does length of light wave determine? - ANSWER hue/what we perceive as color
what does amplitude of light wave determine? - ANSWER brightness
, what does purity of light wave determine? - ANSWER saturation/richness of color
retina - ANSWER light-sensitive tissue lining the back of the eyeball
fovea - ANSWER an area of the retina where vision is the clearest and there are no
rods at all
How does transduction occur, i.e. how does the light wave become a neural impulse? -
ANSWER light -> cornea -> pupil -> iris, behind the iris the thickness and shape of the
lens adjust to focus light on the retina. light sensitive receptor cells in the retinal surface
influence specialized neurons that signal he brains visual centers through bundled
axons, which make up the optic nerve
why do we have a blind spot? - ANSWER where the optic nerve leaves your eye, there
is a hole in the retina with no rods or cones and thus no mechanism to sense light
There are three types of cones, what color wavelengths of light do they respond to? -
ANSWER red (long wavelength); green (medium wavelength); blue (short wavelength)
How do we perceive more than three colors? - ANSWER different combinations of the
three basic elements in the retina
color afterimage - ANSWER form of sensory adaptation- if you stare at a color for too
long, it fatigues the cones corresponding with that cones and will result in an afterimage
with the opposite colors.
What are feature detectors? - ANSWER specialized feature detectors in different parts
of the visual system analyze different features of an object (orientation, color, shape,
etc.)
What is perceptual constancy? - ANSWER refers to the tendency to perceive an object
you are familiar with as having a constant shape, size, and brightness despite the
stimuli changes that occur.
simplicity - ANSWER visual system tends to select simplest/most likely interpretation
closure - ANSWER filling in missing elements of visual scene, allowing us to perceive
edges that are separated by gaps are being complete objects
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