Marijuana or cannabis affects the cerebral cortex through impairment of short-term and working memory, psychomotor coordination, and concentration. It is more of a hallucinogenic substance than a stimulant or a depressant.

What is the definition of psychomotor skills in physical activity

Psychomotor is movements associated with mental activity. Psychomotor agitation is restlessness or unintentional and purposeless actions that are caused by mental tension. Psychomotor Retardation is a slowing of physical movement due to a slowing of brain activity.

Psychomotor agitation or retardation is one of the criteria listed for Major Depressive Disorder (Depression) by the DSM-IV-TR.

No

It's both a stimulant and a hallucinogen.