Psych 104 - Chapter 4
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Psych 104 - Chapter 4
Psych 104 Sensation Perception Chapter
Psych 104 Sensation and Perception - Chapter 4
The perceptual experience of one sense that is evoked by another sense.
Percentage of people with synesthesia
Simple awareness due to the stimulation of a sense organ
Organization, identification, and interpretation of a sensation in order to form a mental representation
When many sensors in the body convert physical signals from the environment into neural signals sent to the central nervous system
Energy conversion in sensation and perception
Physical energy from the world to neural energy in the CNS
To find a reliable way to measure something
What type of psychologist was Wilhelm Wundt?
What type of psychologist was Edward Titchener?
Who used introspection to measure perceptual experiences?
Wilhelm Wundt and Edward Titchener
Who developed psychophysics?
Methods that measure the strength of a stimulus and the observer's sensitivity to that stimulus
The minimal intensity needed to just barely detect a stimulus
Investigators' definition of absolute threshold
Intensity of the stimulus at which an observer can detect it on 50% of the trials
Who proposed the just noticeable difference (JND)?
Just noticeable difference (JND)
The minimal change in a stimulus that can just barely be detected
Standard (s) - with regards to JND
A fixed intensity
What did Ernst Weber notice and in what year?
The just noticeable difference is roughly proportional to the magnitude of the standard stimulus - 1834
The just noticeable difference of a stimulus is a constant proportion despite variations in intensity
Who created Weber's law and who was he influenced by?
Gustav Fechner created it, influenced by Ernst Weber
Signal detection theory
The response to a stimulus depends on: 1. A person's sensitivity to the stimulus, and 2. A person's response criterion
Liberal vs. conservative criterion response
Liberal - tend to say they detect a signal vs. conservative - tend to say they don't detect a signal
Who developed the ideas behind signal detection theory and when?
Gustav Fechner in 1860 - characteristics of the stimulus and the observer need to be taken into account
How effectively the perceptual system represents sensory events
Sensitivity to prolonged stimulation tends to decline over time (organism adapts)