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PSYC62 - Ch9 textbook notes

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University of Toronto Scarborough
Suzanne Erb

PSYC62 Chapter 9 Psychostimulantsanother category of drugs being used more extensively for recreational purposes consists of psychostimulantsand when taken in lowmoderate doses these drugs produce heightened mood at its extremeeuphoria increased vigilance alertness reduced fatigue and tendency to sleep these properties result in enhanced performance on a variety of tasksdose response functions are inverted U or a Jshapedthere are a range of doses where enhancement occurs but as the dose increases beyond this range performance returns to nondrug levels or worsensother frequently used terms are behavioural stimulants and CNS stimulants although some behaviours may increase in some individuals w these drugs others may dramatically decrease depending on the dose the frequency of the behaviour observed wo the drug and the individual within this category there are several structurally different types of drugs MINOR stimulantscaffeinethe most commonly used psychostimulantnicotineanother popular drugMAJOR stimulantsamphetamines along w other structurally related drugsRitalin CylertcocaineCaffeine caffeine is the most widely used behaviourally active drug in the world it is one of several substances referred to as methylxanthines coffee and tea consumption account for the majority of total caffeine intake caffeine has a halflife of 5 hrs peak caffeine levels typically occur in the early evening in humans the reinforcing effects of caffeine have been variable and in some ppl caffeine induces dysphoric effects evidence suggests that caffeine is rated as having the most desirable and pleasant reactions in heavy coffee drinkers particularly after they have not had any coffee for several hrs coffee abstainers report unpleasant and undesirable reactions to caffeinethe effects of caffeine vary considerably among individuals in terms of wakefulness psychomotor coordination mood alterations and autonomic nervous system response 2 cups of coffee containing 150mg of caffeine has moodelevating and fatiguerelieving properties of threshold doses of amphetamine 25mg but larger doses dont have more of a moodelevating effect and 710 cups of coffee may cause insomnia restlessness mild sensory disturbances or muscle tenseness
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