Please Do eat the candy or drink the tea!
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Transcript of Please Do eat the candy or drink the tea!
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Please Do
eat the candy or drink the tea!
Wait for the instructions.
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Biological Psychology:Mechanisms
James KalatN. C. State University
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1. Taste Receptors:sweet, sour, salty, bitter, umami
• Tea made from leaves of gymnema sylvestre block sweet tastes. (Also block intestinal absorption of carbohydrates.)
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2. Neurons and the Action Potential
• No loss of intensity as action potential travels
• Can be relatively slow.• Demonstration of action
potential speed
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Velocity of Action Potential =
Mean distance from ankle to shoulder/mean difference in response latency =
About 1.5 meters/ ______ =
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Correct reference:
• Rozin, P., & Jonides, J. (1977). Teaching of Psychology, 4, 91-94.
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VisionHow far can an ant see?
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3. Color Vision
Young-Helmholtz theory (=trichromatic theory)
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Color Vision
Opponent-process theory
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Rods and cones:• Cones in fovea (center); rods
more common toward periphery• Cones for color; rods for b/w• Therefore: Colorblind in
periphery. Demonstration
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Opponent process theory of color vision:
We perceive by three pairs of opposites:
• Red versus green• Yellow versus blue• White versus black• Evidence: Negative afterimages
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Retinex theory of color vision• We perceive color and brightness
by contrasting each image with the rest of the scene.
• Combine retina and cortex.• Produces color constancy: Same
color despite changes in lighting.
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4. Motion Blindness
What would it be like to have that experience?
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Is the continuous stream of consciousness really continuous?
Temporary blindness implies temporary gaps in consciousness
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5. Developmental Changes
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Visual-motor control
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Max, age 4 Ann, age 7
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Changes in Decision-making:
Adolescents slower than adults to classify
something as “bad idea.”
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Changes in Decision-Making
Adolescents slower than adults to classify something as a “bad
idea.”
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Changes in Anxiety:
Allopregnanolone = steroid released by stress.
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Allopregnanolone decreases anxiety through one kind of GABA receptor, increases it through another kind. The second kind is rare in children and adults, but abundant in adolescents.
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6. Facilitation of the Startle Reflex
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Location of the
Amygdala
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