Class Notes (808,032)
Canada (493,018)
Psychology (7,612)
PSYB65H3 (519)
Ted Petit (310)


3 Pages
Unlock Document

University of Toronto Scarborough
Ted Petit

Lecture7: November 1 , 2010  Addiction is a huge problem in our cultureneed to be aware of the drugs that are present  General overview of how drugs work and the different types of drugs  Today: stimulants: coffee, tea, cocaine  GLOBAL OVERVIEW of how drugs are classified: o Prescription drugs: from doctors o Over the counter drugs: don’t need a prescription for these o Social drugs: nicotine, alcohol, caffeine- you just buy them o Drugs that are not produced commercially (marijuana) or it is made commercially but not to get high from (airplane glue)  Whenever you look at a drug you talk about: addictiveness and tolerance of it  TOLERANCE: you get a decreasing behavioural effect after you take it more than once o Whenever you take a stimulant(drug) it will cause an excess amount of NT to be released so there is more transmitter substancehyper stimulation of synaptic receptors PLASTIC RESPONSE: reduce the number of the postsynaptic receptors and it will compensate for the over active stimulation, so then the postsynaptic neuron won’t fire regularly because it has its own regulation : so over time when you take the same amount of drug over time, you don’t get the same, strong enough effect behaviourally (decrease of sensitivity in the receptors) TOLERANCE: you take the same amount of drug and you don’t feel as high after a long period of time. o For a depressant, postsynaptic neuron is not getting much stimulation so it will increase the number of receptors or their sensitivity. So even if there is very little stimulation the receptors will be able to pick up on every bit of it. This compensation allows the cell to return to normal activity. This is also tolerance. o It’s never permanent on the brain, cyanide is permanent  WITHDRAWAL: once you’re on a drug, you get a withdrawal effects and they can be quite severe. The behavioural effect of withdrawal is exactly the opposite of the effect of the drug itself. o The presynaptic isn’t bombarding the postsynaptic side o When a person comes off a drug, they postsynaptic cell is being under stimulated and will go below average stimulation. o When someone who is taking a stimulant and comes off of it, they become depressed (depression of brain activity and behaviour) and eventually come back to normal. When they are withdrawing from the stimulant, they are tired, they are sad, exhaustion. Not life threatening. o A person who is on a depressant gets super stimulated/hyper-excitable (i.e. shaking, seizures) and high and comes back to normal. Withdrawal from a depressant can be life threateningyou run the risk of the brain going into seizures and becoming too active, you can’t take someone off a depressant right away. LEC7, PSYB65 NOV1ST 1  ADDICTION: implies that the person wants to have the drug, a behavioural or physical dependence on the drug, a requirement for the drug o PSYCHOLOGICAL ADDICTION a behavioural addiction on the drug o PHYSICAL ADDICTION a physical withdrawal symptom(i.e.: blood pressure may go up, body temp go up): there is a clear, physical indication that can be seen o As a general concept/rule: the more rapid the affect of the drug, the more addicting the drug is. EXAMPLE: cocaine grows on the coca tree, and people in Bolivia use the leaves to take the cocoa leaves and make a teaimported into Canada in very concentrated. CRACK cocaine: is much more concentrated, and gives an instant rush Different types of drugs:  All of these stimulants cause an arousal state in the cortical EEG whenever they take a stimulant, the EEG will shift into an arousal state and they inhibit sleep  MILDEST: CAFFEINE o Found in coffee and tea o Different levels of caffeine in tea and coffee o Inhibits sleep o Tolerance: some tolerance does develop towards caffeine, but it’s very little o Withdrawal: headache (because caffeine stops headache), constipation. o Stimulates the digestive system o Toxicity: it’s not very toxic, its e
More Less

Related notes for PSYB65H3

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.