Ch15 - Module 4

Attention-Deficit/Hyperactivity Disorder

What are the symptoms of ADHD?

What are the symptoms of ADHD?

1. First discovered in the classroom

2. 6/9 symptoms of hyperactivity and impulsivity that have persisted for 6 months

Accoding to Sagvolden (2005), what causes ADHD?

a delay of reinforcement gradient that is steeper than normal and is increased by deficiencies in dopaminergic transmission

According to Sagvolden’s theory of delayed reinforcement, people are _____ likely to engage in behavious that are followed by delayed reinforcement

less

In Sagvolden’s theory, boys with ADHD showed impulsive behaviour when ______

the signal was present or absent

What are the causal factors of ADHD?

1. Hereditability - 75-91%

In Mattay’s study, people with the ------- variant performed better with low doses of amphertamines while people with the ------- variant performed worse

val-val, met-met

What brain differences are associated with ADHD?

1. Decreased total brain volume

2. Delayed cortical growth

3. ADHD symptoms resemble prefrontal cortex damage

ADHD treatments

1. Ritalin - inhibits dopamine reuptake

What neurotransmitters are involved in ADHD?

1. Dopamine

2. Norepinephrine