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Lecture

Psych Sept 27 2011.docx

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Department
Psychology
Course
Psychology 1000
Professor
Dr.Mike
Semester
Fall

Description
Caffeine mimics adenosine, which usually makes you drowsy  How do neurons produce an electrical signal? • Extracellular fluids outside neuron • Inside neuron there are ions like Cl, A, Na, K • Builds up a charge on the semipermeable cell membrane How does a neuron code intensity? How does one neuron communicate with another? The Action Potential • Resting Potential = ­70 mV • Stimulate  • Depolarization = Na+ inflow • Threshold = > ­ 55 mV  • In 2 msec charge is +40 mV ie. Change in electrical energy • Repolarization = K+ outflow • Hyperpolarization = below resting potentials • Absolute Refractory Period = neuron cannot be stimulated to generate action  potential • Relative Refractory Period = requires a stimulus to get neuron to threshold to  generate action potentialion Neural Communication Remember Axons generate Action Potential Rest of neuron generates Graded Potential How to code intensity? Neuron fires on all­or­nothing fashion Height of “spike” is fixed Strong stimulus  ▯More neurons Intensity directly proportional to frequency of firing Intensity  ▯Frequency  Max frequency of firi
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