Examlex
Under DSM-IV-TR, it is possible to obtain a diagnosis of ADHD based on Hyperactive and Impulsive symptoms only, present since age 10 and present only at school.
Neurochemical Basis
Refers to the foundation or underlying cause of behaviors and mental processes as determined by the activity of neurotransmitters and neurochemicals in the brain.
Norepinephrine
A neurotransmitter and hormone involved in the body's fight or flight response, affecting attention, heart rate, and blood pressure.
GABA
A neurotransmitter in the central nervous system that inhibits nerve transmission, leading to calming effects.
Serotonin
A neurotransmitter that contributes to feelings of well-being and happiness, also involved in regulating sleep, appetite, and mood.
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