Exam (elaborations)
PSYC 367 Exam Questions And Answers Latest Update
- Course
- Psyc 367
- Institution
- Metro State University
PSYC 367 Exam Questions And Answers Latest Update
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PSYC 367 Exam 2024-2025 QuestionsAnd Answers Latest Update
Staircase method - Run ends after fixed number of reversals/trials, going up or
down for stimulus perceived/not perceived.
Staircase method advantages - - Efficient, most data collected around threshold
- Can be used to track threshold changes over time
Staircase method disadvantages - - errors of anticipation and habituation
- few data points at the extreme ends (far away from threshold), making
psychometric function estimates (eg. slope) difficult
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,Yes/no method - - subject reports presence or absence of stimulus (detection) or
stimulus difference (discrimination)
- very subjective
- experimenter can't verify or dispute subject's response
2-AFC method - - '2 alternative forced-choice paradigm'
- more objective
- subject must prove that they can detect or discriminate the stimulus
2-AFC vs yes/no method - "Is the left or right darker" (objective) vs "Can you see
that this is lighter?" (subjective)
2-IFC method - 2-interval forced choice
Weber's Law (equation) - delta-l = k * l, where k is a constant for a sensory system
(Weber fraction)
Fechner's Law - S = k*log(R), where k is the Weber fraction, R is stimulus level and
S is sensation intensity
Weber's Law -
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,Steven's Power Law - magnitude estimation s=kl^a, where the exponent a
modifies the shape of the curves.
Steven's vs Fechner's law - Steven's law explains why Fechner's Law is violated for
very weak and very intense stimuli
Which cranial nerves are sensory only? - olfactory, optic and vestibulocochlear
(auditory)
Which pairs of nerves move the eyes? - oculomotor, trochlear and abducens
Doctrine of specific nerve energies - The law of specific nerve energies, first
proposed by Johannes Peter Müller in 1835, is that the nature of perception is
defined by the pathway over which the sensory information is carried. Hence, the
origin of the sensation is not important (what fibers are stimulated, not how they
are stimulated)
What domain of wavelengths are visible? - 400 nm and 700 nm
At the interface between two media, light can be - -reflected
-absorbed (medium heats up)
-transmitted (conveyed from one place to another)
Light entering the eye is normally - refracted
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, Pupil - The dark circular opening at the enter of the iris in the eyes, where light
enters the eye
Aqueous humor - The watery fluid in the anterior chamber of the eye
Iris - The colored part of the eye, consisting of a muscular diaphragm surrounding
the pupil and regulating the light entering the eye y expanding and contracting
the pupil
Fovea - The central focal point in the retina, around which the eye's cones cluster
the central focal point in the retina, around which the eye's cones cluster.
Lens - A transparent biconvex structure in the eye that allows light focusing.
Ciliary muscles stretch/flex for far-sighting and relax for near-sighting, giving the
eye a less and more globular shape, respectively.
Optic disk - A hole in the retina where the optic nerve fibers exit the eye; the
cause of the blindspot.
Choroid - Middle, vascular layer of the eye, between the retina and the sclera.
Sensation - The ability to detect a stimulus and to turn that detection into a
private experience
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