Class Notes (809,038)
Canada (493,501)
Psychology (6,025)
Psychology 1000 (2,406)
Dr.Mike (1,197)
Lecture 6

Psychology Lecture 6.docx

4 Pages
Unlock Document

Western University
Psychology 1000

Psychology Lecture 6: Synaptic Communication 1. How do Neurons work? 2. Neural communication 3. The Synapse 4. How do neurons produce an electrical signal? 5. How does a neuron code intensity? 6. How does one neuron communicate with another?  Destroy myelin sheath, slower neural conduction How Do Neurons Work?  2/3 of all neurons housed in cortex  Each neuron has a job, communicate with other neurons  Brain works by creating networks among nerve cells  Neurons use electric and chemical signals to communicate  One neuron releases chemicals over the synapse, and the gates of the other receive the sodium and potassium ions to continue the action potential, through this creating a communication between 2 neurons How does a cell produce an electrical signal?  Extracellular fluid, has a semipermeable cell membrane  Contains Na, Cl, K, A(protein molecule) ions within the neuron  Na, K and Cl ions outside the cell as well  Way more Na outside the cell  Ionic charge on the cell membrane because of ion concentration, inside negative, outside positive  Action Potential – Takes 5-7 ms o -70 mV, resting potential when nothing is happening o Stimulated, incoming sensation, change in electrical potential, goes from -70 and goes positive  Depolarization, result of Na inflow, changing the ionic concentration inside the cell with stimulation  Makes inside of cell more positive o -55 mV is the threshold, all holes open and Na has a giant inflow into the cell  Rushes straight into the cell, goes all the way to +40 mV ionic charge  Only takes 2 ms to complete o Repolarization, K outflow, bringing the neuron back to the resting potential  Goes further than resting potential, below -70  Eventually drifts back to resting potential and waiting for next action potential  When below -70, known as hyperpolarization  Important Points  During repolarization, the steepest drop is known as the Absolute Refractory Period o Nothing can change the neuron at this point, very quick, no stimulation allowed  At end of repolarization, Relative Refractory Period o Can be stimulated, but it takes a lot to do so o Can be stimulated for it to return to resting potential quicker than it normally would Neural Communication  Sodium coming in starts the action potential, then potassium is kicked out, then sodium comes in and it keeps going down the axon making the action potential car
More Less

Related notes for Psychology 1000

Log In


Don't have an account?

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.