Dr. Daniel Amen was at the ready for a scientific stunt for the Kardashian's Hulu show, to show there's medical proof she was experiencing brain trauma ... presumably from the scandal.

So Khloe laid down on the MRI machine and got a brain scan, and the good doc then sat her down with some interesting results.

Dr. Amen showed Khloe the telltale signs showing brain trauma. Who knew, but you can see the subtleties in changes in brain patterns that expose such trauma.

Fact is ... it didn't take a brain scan for Khloe to know she was traumatized. As we reported, Tristan egged Khloe on to have another baby back in July 2021, when he knew he was having a baby with another woman. The fertilized embryo was implanted in a surrogate in November, and weeks later Khloe learned Tristan was having a baby with another woman.

Another interesting tidbit from the episode ... Khloe reveals Tristan proposed to her back in December 2020. Something she kept a secret from her sisters for months, saying she wanted to be proud of the relationship before going public with the announcement.