NATS 1860 Week 3 Notes

NATS 1860 Week 3 Notes - Basics of Vision Tuesday Synapses...

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Basics of Vision Synapses conclusion • Eye Photoreceptors (rods & cones) Colour vision & colour blindness Retina neurons Lateral inhibition & edges Projection to visual cortex Neurons in visual cortex • Orientation • Motion Tuesday, January 22, 2013
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Review of Neural Communication Threshold depolarization First Na+ flows into cell & depolarizes Then K+ flows out of cell & hyperpolarizes • Neurons signal using spike rate: up to 300/sec • Spike travels down axon jumping from gap to gap in the myelin (up to 100 m/sec) Arrives at synapse Ca++ enters and triggers neurotransmitter release Neurotransmitter opens ion channels in dendrite Ions flow into or out of postsynaptic cell Tuesday, January 22, 2013
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Excitatory Synapses Glutamate (GLU) is neurotransmitter Opens Na + ion channels in postsynaptic neuron • Na + ions enter & depolarize neuron E xcitatory P ost- S ynaptic P otential = EPSP Spikes not generated at synapse Tuesday, January 22, 2013
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Inhibitory Synapses GABA is neurotransmitter Opens K + ion channels in postsynaptic neuron • K + ions exit & hyperpolarize neuron I nhibitory P ost- S ynaptic P otential = IPSP Spikes not generated at synapse Tuesday, January 22, 2013
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EPSP & IPSP Interactions Potentials spread to soma & combine there EPSP depolarizations add IPSP hyperpolarizations subtract from EPSPs If EPSPs - IPSPs depolarize to threshold: spike fired
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  • Spring '08
  • AGARD/LANDZBY
  • Tuesday

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