Psychology 1000 Lecture Notes - Lecture 3: Excitatory Postsynaptic Potential, Inhibitory Postsynaptic Potential, Monoamine Oxidase

• School: Western University
• Department: Psychology
• Course: Psychology 1000
• Professor: Dr.Mike

Document Summary

Inside cell: semi-permeable cell membrane and ions na+, k+, cl- 70mv: resting potential: depolarization na+ inflow, losing polarity. 55mv: threshold (cid:498)all or none(cid:499: +40mv: repolarization k+ outflow, absolute refractory period (cid:523)neurons can"t generate signals(cid:524) 90mv: hyperpolarization drops below resting potential for stimulus to work: relative refractory period (must have stronger signal than normal. Coding intensity: neurons fire all or none, height of spike is fixed, code intensity by, frequency of firing (time, neurons have different thresholds, strong stimulus = more neurons. If na+ channels open -> depolarization, more positive. Inhibitory and excitatory, depending on whether it opens na+ or k+ channels: arousal, eating, acetylcholine (ach) Inhibitory and excitatory: memory, motor, behavioural inhibition, dopamine (da)* Inhibitory and excitatory: voluntary movement, mood, arousal, serotonin (5-ht)* Inhibitory and excitatory: sleep, thermoregulation, aggression, gamma-aminobutyric acid (gaba) Case study: phinneas gage, railway accident caused a rod to enter his frontal cortex.