Examlex
In single-case experiments, direct observation is always better than using self-report scales or available records.
Stimulant
A substance that raises levels of physiological or nervous activity in the body.
Depressant
A substance that slows down the activity of the brain and nervous system.
Hallucinogen
A class of psychoactive substances that cause changes in perception, thought, and feeling, leading to visual or auditory hallucinations.
Dyslexia
A learning disorder marked by difficulty reading due to problems identifying speech sounds and decoding.
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