PSY 164 Lecture Notes - Lecture 2: Magnetic Resonance Imaging, Tangled, Myelin
Document Summary
Myelin sheath: fat jackets wrapped around axons act as insulation. Action potential: influx of sodium; starts at hillock and goes until axon terminals. Excitatory: + (increase) lift in charge gets us closer to action potential. Inhibitory: - (decrease) lift in charge puts us further away from an action potential. Temporal summation: is the transmission from a showed up before b enough that the excitation could get to the cell body before inhibition from b. Inhibition first excitation: cancels out; no action potential. Excitation first inhibition: action potential is enacted. Fire off a couple of action potentials occasionally; weekly phone call to mom. Gives 2 ways to communicate: increase in communication: calling a bunch, decrease in communication: suddenly stops calling once a week. Single unit recording: recording one neuron at a time. Lowering one electrode into the brain, recording one neuron. Multiple unit recording: recording 2+ neurons at a time. Sending grid of electrodes into brain, recording many neurons.
