You swing a weight attached to a string in a vertical circle. At the top of the circle the string just barely goes slack for an instant. Choose the correct statement for the the centripetal acceleration of the weight. A. Equal to g.
B. Greater than g.
C. Less than g.
D. Can't answer without knowing the weight's speed.

it may be wrong but i think its a

dopamine..

"it was found that some people who were taking the drug l-dopa to raise their levels of dopamine were developing schizophrenic-like symptoms supporting research a strength of the dopamine hypothesis is that there are many studies which have shown support for the neurochemical explanation."