MMM4 - Chapter 4: Sensation and Perception Sensation and...

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Chapter 4: Sensation and Perception
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Sensation and Perception: The Distinction Sensation : stimulation of sense organs Perception : selection, organization, and interpretation of sensory input Psychophysics = the study of how physical stimuli are translated into psychological experience
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Figure 4.1 The distinction between sensation and perception
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Psychophysics: Basic Concepts Sensation begins with a detectable stimulus Fechner : the concept of the threshold Absolute threshold : detected 50% of the time Just noticeable difference (JND) : smallest difference detectable Weber’s law : size of JND proportional to size of initial stimulus
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Figure 4.2 The absolute threshold
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Psychophysics: Concepts and Issues Signal-Detection Theory : Sensory processes + decision processes Subliminal Perception : Existence vs. practical effects Sensory Adaptation : Decline in sensitivity
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Figure 4.3 Signal-detection theory
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Vision: The Stimulus Light = electromagnetic radiation Amplitude : perception of brightness Wavelength : perception of color Purity : mix of wavelengths perception of saturation , or richness of colors
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Figure 4.5 Light, the physical stimulus for vision
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The Eye: Converting Light into Neural Impulses The eye: housing and channeling Components: Cornea : where light enters the eye Lens : focuses the light rays on the retina Iris : colored ring of muscle, constricts or dilates via amount of light Pupil : regulates amount of light
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Figure 4.7 The human eye
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The Retina: An Extension of the CNS Retina : absorbs light, processes images Optic disk : optic nerve connection/blind spot Receptor cells : Rods : black and white/low light vision Cones : color and daylight vision Adaptation: becoming more or less sensitive to light as needed Information processing: Receptive fields Lateral antagonism
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Figure 4.8 Nearsightedness and farsightedness
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Figure 4.9 The retina
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Figure 4.10 The process of dark adaptation
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The Retina and the Brain: Visual Information Processing
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This document was uploaded on 10/29/2011 for the course PSY 101 at SUNY Buffalo.

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MMM4 - Chapter 4: Sensation and Perception Sensation and...

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