Lisa from 'Saved By the Bell' Lark Voorhies -- Bipolar Accusation Is LAUGHABLE

Lark Voorhies -- who played Lisa Turtle on "Saved By the Bell" back in the day -- says her mother's full of crap ... insisting she is NOT bipolar, despite her mother's claims.

Lark's mother recently told People her daughter had been diagnosed with bipolar disorder -- but this week in L.A., Lark told us she finds the report "comical."

But the video is really bizarre -- Lark can't seem to complete a thought, taking abnormally long pauses and speaking nonsensically ... saying things like, "Well you know, people want to express themselves and ... you know, they will do so at free random."

"The particular trade editorial [presumably People] and I are not in agreement, however. It’s so far left from what was actually atrast [???] or brought about."

Watch the video and see for yourself.