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Lecture 7

Psych lecture 7 October 3rd.docx

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Western University
Psychology 1000

Psych lecture 7 October 3 , 2013 • Review of Neurons • Gross Brain Anatomy • The Cortex • What happens when multiple neurons synapse? • How do drugs work? • What are the major structures of the brain? Cortex is the most important part JOIN INTO THE DISCUSSIONS ON OWL!!!!!!! IT’S OPEN UNTIL OCTOBER 17 TH Next Time: Lateralization. Finish chapter 3 *Synaptic transmission: explains the delay in response latency for a reflex arc Reiterated the importance of knowing:  Acetylcholine (Ach) – functions in excitatory and inhibitory systems (related to memory, motor, behavioural inhibition)  Norepinephrine (NE) – functions in excitatory and inhibitory systems (related to arousal, eating)  Dopamine (DA) – functions in inhibitory, sometimes excitatory, systems (related to arousal, voluntary movement)  Seratonin (5-HT) – functions in inhibitory and excitatory systems (related to sleep, thermoregulation)  Gamma Aminobutynic Acid (GABA) – functions in inhibitory systems (related to motor behaviour) (Bolded appear most often is psychology) Also knowing the results of the following drugs: • Nicotine – stimulates receptor molecules, “duplicating” effects of Ach (agonist – chemical that stimulates activities) • Caffeine – blocks adenosine receptor sites (antagonist – reduces activities by blocking receptor sites) Neuron Summary o All neurons fire – they all generate action potentials o Action potential happens or it doesn’t no in between o Intensity coded as frequency. Excitatory neurons vs. inhibitory neurons o Different transmitters o Influence on receptor sites o Neurotransmitters effect this • Excitatory neurons o Depolarizes postsynaptic membrane (excitatory postsynaptic potential) o Inhibitory neurons hyperpolarize • Epsp’s and ipsp’s are additive across space and time o Graded potentials o How often they are fired • “constant” inhibition effectively “raises” threshold o The dendrites can have a lower threshold and will then take longer to excite • A single neuron might synapse with many others o Disinhibiting is inhibiting the inhibitor so that a neuron can get back to its resting potential. The Brain Brain Facts o Composed of white
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