Sensation

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Sensation Perception

• Sensation
• the detection of physical energy by receptors and
  the conversion of that information into neural
  signals.
• Perception
• the interpretation and organization of sensory
  experiences.

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Psychophysics

• Thresholds
• Absolute the minimum energy required for
  detection 50 of the time.

SUBLIMINAL STIMULATION?
SUBLIMINAL STIMULATION?
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Psychophysics

• Thresholds
• Absolute the minimum energy required for
  detection 50 of the time.
• Subliminal stimulation?
• Difference smallest amount of change from
  original stimulus necessary to detect a
  difference.

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Psychophysics

• Signal Detection Theory
• the detection of environmental stimulation by
  sensory systems that have been affected in some
  way (fatigue, arousal, etc.)
• Sensory Adaptation
• reduction in sensitivity to the presence of
  constant stimulation.

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Vision

• The Visual Stimulus Light
• Characteristics of light
• wavelength color (hue)
• amplitude brightness (intensity)

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Vision

• How We See The visual system
• The Eye
• CORNEA
• PUPIL
• IRIS
• LENS
• RETINA

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Rods Cones

• Straight shape
• More common in the periphery
• Sensitive to dim light
• Sees only black white

• Cone shape
• Common in the center (fovea)
• Sensitive to bright light
• responds to color ( 3 types)

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Visual Information Processing

• Feature Detectors
• individual brain cells respond best to particular
  characteristics of the visual scene.
• Parallel Processing
• the brain can analyze several types of visual
  information simultaneously (color, motion, shape,
  depth)

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Color Vision

• Young-Helmholtz Trichromatic Theory
• 3 types of cones, each of which are sensitive to
  one of the primary colors (red, green, or blue)
• Opponent Process Theory
• color processing which occurs after information
  leaves the receptor cells.
• Information is analyzed by color opposites
• Afterimages

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