Intro to Psychology 100 Mid Term Notes
Intro to Psychology 100 Mid Term Notes psy-p 101
Popular in Introductory Psychology I
Popular in Psychology (PSYC)
This 5 page Study Guide was uploaded by Sarah Gordon on Friday September 23, 2016. The Study Guide belongs to psy-p 101 at Indiana University taught by Irene Vlachos-Weber in Fall 2016. Since its upload, it has received 23 views. For similar materials see Introductory Psychology I in Psychology (PSYC) at Indiana University.
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Date Created: 09/23/16
The Neuron E. How neurons communicate: electro-chemical 1. Overview a. electrical : info moves along neuron (held in place) action potential i. action potential: neural impulse neuron firing...one direction ii. travel down axon → neuron b. chemical: infor passes from neuron to neuron i. chemical → neurotransmitters ii. (synaptic transmission) → synapse is a gap (neurons don’t actually touch) iii. One neuron is going to release the chemical and will bob/float over to the receiving neuron and this action happens between the gap iv. Not having enough of neurotransmitters serotonin will lead to anxiety or OCD or other disorders like depression … having too much of neurotransmitters can be problematic too 2. Electrical: Action Potential (AP = nerve impulse) a. electrical impulse = travels from dendrites to nd of axon b. neurons = like battery= (at rest fires at rest again) i. When at rest: 1. inside : (-) charged 2. outside : (+) charged c. shift in charge causes AP i. cell membrane: separates inside/outside of cell 1. ions: (+) and (-) molecules → pass in and out of membrane ii. membrane = semi-permeable: some ions pass, others cannot d. resting neuron = polarized i. resting = not transmitting info 1. If you have large groups of neurons continuing to fire, then it will lead to a seizure … therefore we know that not all of them are firing at the same time … different parts of your brain are firing...frontal lobe is engaged currently because its decision making and we are taking notes ii. polarized = inside of cell is more (-) than outside of cell (this is relative … it is just MORE negative charge relative to the outside) 1. That neuron won’t fire unless it is stimulated 2. Think of sexual metaphor or club/bar scenario a. club neuron...have to be 21 to get into a bar think of it as K+... and kids that aren’t 21 are outside so Na+... the bouncer is keeping the sodiums out ask the questions and an’t get in→ this is the on pump” which will keep the sodium out and the potassium pump i. 1] (Na+) outside cell ii. 2] (K+) inside cell iii. 3]ion pump 3. stimulated neuron: AP a. depolarized: inside becomes less (-)than outside i. 1] when inside is more (+) than outside = AP begins ii. 2] gates open = Na+ in 1. When the stimulation is enough, the ion pump stops working (think club neuron you need the bouncer to stop working in order for you to get in) and so the gates open (you sneak in back door) and all the potassium leaves (all the 21 year olds are like ew and leave) a. AP starts by soma, travels down the axon b. Na+ in K+ out, and until reaches synapse (gap between Ns) neurons receive and go through dendrites...through terminal buttons iii. 3] after AP passes → ion pump again K+ in/Na+ out 1. Bouncer realizes what happens and tries to fix it iv. 4] cell = repolarized → back at rest 4. all-or-none law: neuron fires or doesn’t (if stimulation enough) a. fire at same strength b. think of toilet flushing cannot flush it harder...but if you flush it with enough strength it fires and it will flush at the same speed every time … that is what your neurons will do. there is no half ass in this. 5. rate of speed: a. 2 - 200 mph (=120m/s) b. faster = myelin sheath (glia wrapped around axon) 3. Chemical: Synaptic Transmission
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