Assertion: amphetamine's effect | /r/HasProperty | indirect one
Facets:
value: in many cases
type: TEMPORAL
Source sentences:
text: A key effect that all drugs that cause dependence and addiction appear to have in common—a dramatic increase in dopamine signaling in a brain area called the nucleus accumbens (NAc), leading to euphoria and a desire to repeat the experience—is in many cases an indirect one.