Receptors

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Receptors

• Transduction vs. Conduction

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Taste Experiment

• Close eyes
• Instructor will hand you a piece of gum
• Pinch nose closed and hold closed with one hand
• Insert gum into mouth and chew with other hand
• Try to guess flavor
• Rate flavor intensity on scale of 1 to 3
• 1 no flavor
• 2 mild flavor
• 3 strong flavor
• Repeat procedure but with nose unplugged
• Record results

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Photoreception and Local Integration
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Blind spot test

• Follow instructions on hand-out
• Measure distance of paper to eye (each eye)
• Record distance in cm

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Sound
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Transduction of Sound

• Sound Waves (outer ear)
• ? Mechanical Vibrations (middle ear)
• ? Fluid Waves (inner ear)
• ? Chemical signals
• ?Action Potentials

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Amplitude loudness Greater bending of hair
cells Wavelength pitch Location of crossing
along cochlear duct
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Mosquito Sounds
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Somatic Sensory Receptors
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Thermoreceptors

• Map location of hot and cold receptors on back of
  hand
• Indicate location of 25 receptors
• Blue for cold
• Red for hot
• Take picture of map with digital camera

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Two-point Threshold

• Test on
• 1. Back of hand
• 2. pointer finger, finger tip
• 3. One other location of your choosing
• Record distance between tips of toothpick when 2
  points can be detected

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Keeping the Information Straight

• Modality
• Location
• Intensity
• Duration
• Integration

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Perception is dependent on communication between
different parts of the brainTemporal Lobe of
Cerebrum
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Facial Recognition
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Temporal Lobe of Cerebrum