PSYC 355 Chapter Notes - Chapter 4: Optogenetics, Exosphere, Axon
6 Dec 2016
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Document Summary
When neuronal membrane is at rest inside is - outside is + Action potential = reversal, inside becomes + while outside is - Action potential = a spike, a nerve pulse or a discharge. Frequency and pattern of action potential code used by neurons to transfer information from one location to another. The ups and downs of an action potential. During action potential membrane potential = briefly positive. Neuronal membrane is at rest voltmeter reads -65 mv. Action potential graph membrane potential versus time. 1st part rising phase: rapid depolarization about 40 mv. Change in membrane potential continues until vm reaches peak value . Overshoot: part of action potential where inside of neuron is positively charged with respect to outside. Falling phase: rapid repolarization until inside of membrane is more negative than resting potential. Last part of falling phase undershoot or after-hyperpolarization. Perception of pain caused by generation of action potentials in certain nerve.
