receptors transduction vs. conduction
TRANSCRIPT
Receptors
• Transduction vs. Conduction
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
Photoreception and Local Integration
Blind spot test
• Follow instructions on hand-out
• Measure distance of paper to eye (each eye)
• Record distance in cm
Sound
Transduction of Sound
Sound Waves (outer ear)
Mechanical Vibrations (middle ear)
Fluid Waves (inner ear)
Chemical signals
Action Potentials
Amplitude = loudness = Greater bending of hair cells
Wavelength = pitch = Location of crossing along cochlear duct
Mosquito Sounds
Somatic Sensory Receptors
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
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
Keeping the Information Straight
• Modality
• Location
• Intensity
• Duration
• Integration
Perception is dependent on communication between different parts of the brain
Temporal Lobe of Cerebrum
?
?
Facial Recognition
Temporal Lobe of Cerebrum