Textbook Notes

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Published on 19 Jun 2011
School
UTSC
Department
Psychology
Course
PSYA01H3
Chapter Five: Sensation
Sensation the detection of the elementary properties of a stimulus
Perception the detection of the more complex properties of a stimulus,
including its location and nature; involves learning
Transduction the conversion of physical stimuli into changes in the activity
of receptor cells of sensory organs
Receptor cell a neuron that directly responds to a physical stimulus, such as
light, vibrations, or aromatic molecules
Anatomical coding a means by which the nervous system represents
information; different features are coded by the activity of different neurons
Temporal coding a means by which the nervous system represents
information; different features are coded by the pattern of activity of
neurons
Psychophysics a branch of psychology that measures the quantitative
relation between physical stimuli and perceptual experience
Just-noticeable difference (jnd) the smallest difference between two similar
stimuli that can be distinguished; also called difference threshold
Weber fraction the ratio between a just-noticeable difference and the
magnitude of a stimulus; reasonably constant over the middle range of most
stimulus intensities
Threshold the point at which a stimulus, or a change in the value of a
stimulus, can just be detected
Difference threshold an alternative name for just-noticeable difference (jnd)
Absolute threshold the minimum value of a stimulus that can be detected
Signal detection theory a mathematical theory of the detection of stimuli,
which involves discriminating a signal from the noise in which it is embedded
and which takes into account participants willingness to report detecting the
signal
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Document Summary

 sensation the detection of the elementary properties of a stimulus.  perception the detection of the more complex properties of a stimulus, including its location and nature; involves learning.  transduction the conversion of physical stimuli into changes in the activity of receptor cells of sensory organs.  receptor cell a neuron that directly responds to a physical stimulus, such as light, vibrations, or aromatic molecules.  anatomical coding a means by which the nervous system represents information; different features are coded by the activity of different neurons.  temporal coding a means by which the nervous system represents information; different features are coded by the pattern of activity of neurons.  psychophysics a branch of psychology that measures the quantitative relation between physical stimuli and perceptual experience. Just-noticeable difference (jnd) the smallest difference between two similar stimuli that can be distinguished; also called difference threshold.