Okay with a tv that is using frame doubling with 1 display which is seen by both eyes.
With Brainwarp its kinda more like active shudder 3d glasses.
Brainwarp uses 2 displays. Because the eyes are rendered 1 at a time in sequence. Each eye when rendered is a complete frame.
Left image right blank = 1 frame
Left blank right image = 1 frame
The brain (yours) essenitally sees 150 to 180 because display 1 refresh + display 2 = 150 to 180.
Now remove brain warp and both eyes render simultaneously thus the frames perceived beomes only 75 to 90 hz.
By rendering sequentially the brain fills in the blank from what it knows of the eye with image. By rendering display/eye at time the refresh/frames combine to create a pseudo effect on the mind. The mind sees more frames as a result. Turn brainwarp off & the mind only see max 75 to 90.
If you consider the old view master with negatives usually there is a pic with the sun present & one without. This creates a 3d effect but your mind thinks the sun is in both stills even though only 1 eye in truth can see the sun.
Simple truth we won't know how well this magic trick works until a combination of reviews & trying it out ourselves. If its not as good by individual preference then the team has added the option to switch it off.