PSYC 101 Lecture Notes - Lecture 3: Selective Serotonin Reuptake Inhibitor, Transcranial Magnetic Stimulation, Functional Magnetic Resonance Imaging
55
PSYC 101 Full Course Notes
Verified Note
55 documents
Document Summary
Dendrites: receive information from other cells, on the same side as cell body. Axon: can be very short or over 1 meter long. Myelin: insulation, grey vs. white matter, white has myelin, o. 5-10 m/s vs. up to 150 m/s, modes of ranvier. Resting state: higher concentration of potassium inside neuron, higher concentration sodium outside neuron, neuron is negatively charged at rest. Action potential: electrical current shoot down axon (exchange of sodium and. Nothing you can do to make it fire again: relative refractory period. Could make it fire again, needs a stronger stimulus to make it happen. Releases neurotransmitters into the synapse, gap between neurons. Increase or decrease the likelihood that the receiving cell will fire. Can be small or big, the closer you get to the threshold, the more likely you are to fire. Drugs: excitatory-- more likely, inhibitory-- less likely, agonists mimics the action, antagonists opposes the action. Enjoyable behavior increases dopamine: inhibitory and excitatory, control of movement.
