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PSYCH 1NN3 (38)
Joe Kim (19)

Neurosciene In-Class Lecture.docx

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McMaster University
Joe Kim

N EUROSCIENCE IN -CLASSL ECTURE  100 billion neurons in brain  Brain constructs world  Hebbion Learning provides mechanism for neural coding  Prion knowledge interact 3 classes of neuron  Neurons can synapse from CNS to muscle neurons or sensory neurons  Sensory neurons can go through process of interneurons Sample neural circuit- Knee-jerk reflex  Hitting hammer on knee signals sensory neurons, which synapses to spinal cord, then synapses either to motor neuron in leg causing leg to react, or sensory neurons connected to interneuron attach to motor neuron in back of leg causing leg to relax  Info doesn’t have to travel to brain it’s a reflexive action Heuristic and prior knowledge  A bat and a ball cost $1.10.  Bat costs $1 more than the ball  How much does each item cost? o $0.05 and $1.05 o x+y=$1.10 o x-y=1  Why do people have a hard time solving for it? o Looking for quick answer, regardless of simplicity of steps o Calc causes people to overthink it o Prior knowledge shapes how you approach problem, and perceive problem differently Visual top down processing  How prior knowledge/ context makes you react to certain situations (stripper/shovel picture drawn by kid) Audio top down processing  Language stream segmentation problem o Ex. how to recognize a speech o How to wreck a nice beach o Audio gets converted into what makes most sense given context Top down processing meets sensory processing  Assuming physical quantiies about world your used to  Assuming shadow cast over square B (A and B of checkerboard) results in equal luminosity over both square, however, shadow causes you believe B is lighter in reality  “Brain constructs your world” Thought and Behavior  Hebbian Learning- Canadian neuroscientist discovered that neurons fired together wire together- physical connection between neurons fired together o Neurons coding for conditional/unconditional stimulus fire together, increasing chance that when one fires, other fire Sensory and motor homunculi  Region of sensory and motor cortex corresponding to sensitivity of diff parts
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