PSY 2301 Lecture Notes - Lecture 6: Basal Ganglia, Neuroglia, Myelin

• School: University of Ottawa
• Department: Psychology
• Course: PSY 2301
• Professor: Andree- Anne Ledoux

Document Summary

Sensory stimuli produce action potentials: temporal summation; two stimuli that pulse at a very similar time can sum together. If excitation reaches threshold potential, you have activation of the voltage gated channels: graded potentials are summed temporarily or spatially. Graded potentials occur on the dendrites or soma. spatial summation; epsps at the same time and close together add to form a larger stimulation. If we do, the voltage gated channels will open at the axon hillock. It is at the axon hillock where the action potential can be propogated. There are channels for sodium and potassium, but they are not voltage gated: the action potential is jumping along the axon from one node of ranvier to another node of ranvier. There are voltage gated channels in the node of ranvier, the myelin sheath is insulating the other part of the axon. Each hair on our body allows us to detect the slightest displacement.