Stephens_Lecture5-Spr2010

Stephens_Lecture5-Spr2010 - Neural Mechanisms of Behavior -...

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1 Neural Mechanisms of Behavior - I Hunting Bats / Evasive Insects Search Approach/Track Terminal
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2 The 3 Stages of Neural Processing 1. Receive Input (sensory neurons) 2. Transmit & Process (interneurons) 3. Generate Output (motor neurons) Neurons Carry Information. .. How? Neurons Carry Information. .. How? •Generate & propagate “electrical” information 1) resting membrane potential 2) action potential 3) propagation •Encode information •Transmit information 1) electrical synapses 2) chemical synapses Some Terminology About Action Potentials depolarization (away from -70 mV in positive direction) repolarization (back toward -70 mV) hyperpolarization (more negative than -70 mV) resting membrane potential (-70 mV) threshold
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3 1. The “ Resting Membrane Potential • at rest neurons have a “charge” (i.e., a “potential”) • that is, they are “polarized” electrical and concentration gradients + - [Na + ] [Na + ] [K + ] [K + ] 1. The “ Resting Membrane Potential in out 2. The “ Action Potential voltage-gated Na + channels voltage-gated K + channels
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4 in out Na + Channel K + Channel + + + + + + + + Na + K + Outside (+) Inside (-) 2. The “ Action Potential Na + Channel K + Channel + + + + + + + + Na + K +
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This note was uploaded on 02/20/2010 for the course BIOL 3411 taught by Professor Stephens during the Spring '10 term at Minnesota.

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Stephens_Lecture5-Spr2010 - Neural Mechanisms of Behavior -...

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