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PSYC 367 Quiz 1 Exam Questions And Answers Latest Update

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PSYC 367 Quiz 1 Exam Questions And Answers Latest Update

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  • December 18, 2024
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  • 2024/2025
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PSYC 367 Quiz 1 Exam 2024-2025
Questions 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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