Class Notes (836,100)
Canada (509,630)
Psychology (3,977)
PSYC 2390 (191)
Lana Trick (148)
Lecture

Jan 10th Lecture

3 Pages
77 Views
Unlock Document

Department
Psychology
Course
PSYC 2390
Professor
Lana Trick
Semester
Winter

Description
Jan 10 Sensation and Perception 1. Action potentials cont. - transfer of ions that occurs has an effect on the membrane potential which is measured with a volt meter - membrane lets their ‘gates’ in for sodium to come in for a fraction of a second when the membrane becomes positive (millivolts) and then potassium flies out which leaves the neuron even more negative than it was in the beginning - recovery period involves sodium potassium punmp - a dim light might have 200 a.p. per second whereas a bright light would have 400 a.p. - intensity of a sense can be determined through number of action potentials per second but there is a limit—500 to 800 a.p. per second - if something is too intense, the cell cannot signal it anymore - unmyelinated axons must have an exchange of ions throughout the entire axon; but this is not the case for mylenated axons (ions can jump) that is called salutatory conduction - at the end of an axon there are the ‘pouches’ called synaptic vesicles; electrical charges cause neurotransmitters to be released through the synaptic gap to other axons granted that there is an action potential 2. excitatory effects - some neurotransmitters have excitatory effects - excitatory neurotransitters increase the probability that the receiver will have an a.p; they increase the positivity (depolarize) - most neurons already have a spontaneous activity level (for ex. 20 ap/sec) - if you add an excitatory neurotransmitter, it could increase the neuron to 24 ap/sex for example - acetylcholine (ACh) is in the brain but also throughout the body and tells the muscles what to do - black widow spiders; their venom causes a flood of ACh; causes muscle contractions or spasms - curare; drug that they use in blow guns, curare plugs up the dendrites and prevents ACh to get to the muscles and paralyzes - glutamate; neurons respond too much to stimulation, schizophrenic people are high in glutamate 3. inhibitory effects - reduce the probability that a neuron will have an action potential when inhibitory neurotransmitters are released - you will only see an effect if the neuron involved has a spontaneous activity level (for ex. If a neuron has 20 ap/sec spontaneous activity, an inhibitory neurotransmitter might make it be 16 ap/sec) 4. neural circuits - neuron (when stimulated sends excitatory neurotransimitters) - - neuron (when stimulated sends inhibitory neurotransmitters) - linear circuits can involve exclusively inhib or excit or both - converging circuits involve two neurontransmitters (only excit or inhib or both) sending info to a receiver neuron - A and B neurotransmitters send info to C neuron - A (24 ap/sec) + B (16 ap/sec) = 20 ap/sec; it acts like it wasn’t stimulated at all because the excitatory and inhibitory neurotransmitters cancel eachother out 5. Neurosciences - neuroanatomy involves taking a deceased organism and looking at its body tissues - lesion studies (brain damage/neural damage) - single cell studie
More Less

Related notes for PSYC 2390

Log In


OR

Join OneClass

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

Sign up

Join to view


OR

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.


Submit