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UNIT 4. SENSATION AND PERCEPTION. Housekeeping. Check Unit 7 Project Grades Be mindful of the deadline on the Unit 9 project. The Doorway to Psychology. TERMS YOU SHOULD KNOW Sensation Perception Transduction. The Doorway to Psychology. ABSOLUTE THRESHOLD

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unit 4

UNIT 4

SENSATION AND PERCEPTION

housekeeping
Housekeeping

Check Unit 7 Project Grades

Be mindful of the deadline on the Unit 9 project

the doorway to psychology
The Doorway to Psychology
  • TERMS YOU SHOULD KNOW
    • Sensation
    • Perception
    • Transduction
the doorway to psychology1
The Doorway to Psychology
  • ABSOLUTE THRESHOLD
    • minimal intensity needed to just barely detect a stimulus
  • JUST NOTICEABLE DIFFERENCE
    • Weber’s Law (constant proportion)
  • SENSORY ADAPTATION
vision
Vision
  • Sensing light
  • Properties of light waves
    • length
    • amplitude
    • purity
the human eye
The Human Eye
  • Cornea
  • Pupil
  • Retina
  • Accommodation
  • Cones
  • Rods
  • Fovea
  • Optic nerve
visual pathways in the brain
Visual Pathways in the Brain
  • Visual streams
  • Ventral (below) stream
    • across occipital lobe into lower levels of temporal lobes (shape and identity)
  • Dorsal (above) stream
    • travels up from occipital lobe to parietal lobes (location and motion)
sensing sound
Sensing Sound
  • Three physical dimensions of sound
    • frequency
    • amplitude
    • complexity
  • These determine what we hear
    • pitch
    • loudness
    • timbre
touch
Touch
  • Haptic perception
  • Thermoreceptors
  • Neural representation of the body’s surface
    • contralateral organization
    • somatosensory representation (fingers vs. back)
smell
Smell
  • Only sense directly connected to forebrain
  • Olfactory receptor neurons (ORNs)
  • Olfactory bulb
taste
Taste
  • Identifying things that are “bad” for you
  • Taste buds (5 different types)
    • salt
    • sour
    • bitter
    • sweet
    • umami (savory)
    • each contains several types of taste receptors (microvilli) that react with tastant molecules in food