Chapter 18 - Drugs Flashcards
the removal or reduction of an aversive stimulus that is contingent on a particular response, with an attendant increase in the frequency of that response
- A behaviour that turns off (or reduces) an aversive stimulus will be reinforced.
- response makes unpleasant stimuli decrease/end
negative feedback
body’s attempt to compensate for unusual condition
– decrease in sensitivity to a drug that comes from repeated use
tolerance
primarily the opposite of the effects of the drug
withdrawl symptoms
liking
hedonic value
wanting
positive-incentive value
anticipated pleasure associated with an action
positive-incentive value
amount of pleasure that is actually experienced.
hedonic value
Animals are first trained to make a response (press a lever), that is reinforced by iv injections of drug (cocaine).
Response is extinguished – injections of saline instead of cocaine.
Once the animal stops responding (pressing the lever), experimenter administers a “free” injection of drug.
In response, animals begin pressing lever again.
- inhibition of dACC prevents reinstatement
- activation of vmPFC inhibits responding
reinstatement
new form of learning, animal does not forget to make a particular response, it learns not to.
- vmPFC plays critical role; stimulation of vmPFC with AMPA blocked reinstatement of responding normally produced by free shot of cocaine
- activation of vmPFC inhibited responding
extinction
involved in the behavioral effects of natural reinforcers
endongenous opiods
(blocks opiate receptors) reduce the reinforcing effects of alcohol in humans and rats.
- blocks u opiate receptors
antagonized the reinforcing and sedative effects
naloxone
sudden withdrawal from long-term administration of a drug caused administration of an antagonistic drug
Antagonist-precipitated withdrawal
Potent DA agonists
cocaine and amphetamine
hallucinations, delusions of persecution, mood disturbances, repetitive behaviours
psychotic behaviours
blocks CB1 receptors
Rimonabant