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PSYC 367 Quiz 1 Exam Questions And Answers Latest Update
- Course
- Psyc 367
- Institution
- Metro State University
PSYC 367 Quiz 1 Exam Questions And Answers Latest Update
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PSYC 367 Quiz 1 Exam 2024-2025Questions And Answers Latest Update
Fechner's law - a principle describing the relationship between stimulus
magnitude and resulting sensation magnitude (scaling)
magnitude estimation - a psychophysical method in which the observer assigns a
number to describe the perceived stimulus intensity
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,Stevens' power law - a principle describing the relationship between stimulus
magnitude and resulting sensation magnitude, such that the magnitude of
subjective sensation is proportional to the stimulus magnitude raised to an
exponent
cross-modality matching - a scaling method in which the intensities of sensations
that come from different sensory modalities are matched
catch trials - trials in a signal detection experiment on which no stimulus is
present
hit - participant says "yes" when the stimulus was actually present
miss - participant says "no" when the stimulus was actually
false alarm - participant says "yes" when the stimulus was not present
correct rejection - participant says "no" when the stimulus was not present
sensitivity - the ease with which a perceiver can tell the difference between the
presence and absence of a stimulus or the difference between stimulus 1 and
stimulus 2
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, d' - the statistic that reflects a perceiver's sensitivity; represented by overlap
between the theoretical noise and signal+noise distributions
endogeneous noise - spontaneous neural activity that affects the measurement of
thresholds and sensitivity
criterion - non-sensory response bias within a perceiver; depends on expectations
and motivation
Give a description and an equation for Fechner's law, and explain how it makes
use of Weber's law. - S=k log R
s= sensitivity
k= is the weber fraction
R= stimulus level
Fechner used weber's law to describe sensation so weber's said JNDs produce
equal steps in sensation whereas Fechner says sensory steps in the upper limit
require increased stimulus. (log) not linear like weber
Fechners law gives the sensation intensity (S), with respect to webers fraction (k)
multiplied by the log of the stimulus level (R). The JND is given by webers law and
is equal to (ΔI) and is attained through an experiment
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