Mischa Barton was hallucinating during infamous back garden rant

Actress Mischa Barton was experiencing "a complete hallucination" when she started ranting at neighbors over her garden fence in January (17).

The Sixth Sense star was filmed yelling about her mother as police arrived at her home to take her to a hospital for a mental evaluation, and now Mischa has opened up about the bizarre incident in a TV chat with Dr. Phil McGraw.

She believes she was slipped a cocktail of drugs at a party, and admits she only has a very hazy memory of what led to the police intervention.

The actress told Dr. Phil, "I think it was complete hallucination. I have no idea what I was talking about."

But she can recall seeing "specks of light".

"There's also blackout parts, like, earlier in the night, and then I'll remember my friend saying, 'Please lay down', and then it'll be gone again," The O.C. star added. "And then the whole part outside is just blackout."

The candid TV interview will air on Monday (03Apr17).