I am so happy that I found this thread. Because when I was trying to search for something like this previously, I was not successful as it is not easy to describe what you are experiencing. I only found one guy on reddit with partly same issue. So it's really relieving to know there are more people who have such issue.
But it's really sad at the same time because nobody have shared any cure to it yet.

My situation:
My right eardrum pulsates/thumps/twitches whatever you call it. It started about 3 years ago.
Mostly it happens when men speak, despite whether through remote audio call through speakers/headphones or in reality when they are somewhere near me. A few times it happened with women voices as well. But to sum up - my ear reacts to low frequency voices.

Right eardrum stops pulsating when I cover the left ear completely with something (e.g. with a hand).

When I watch news on television where men speak I need to lower the sound of the tv to the absolute minimum to get rid of that annoying pulsation/flickering/tingling. I consulted with a few otorhinolaryngologists already, some tests were made, nothing was found. I was said just to live with it.

And I cannot. I am starting to hate those people from whom I get the annoying pulsation to have around me.
It would be really nice to find an answer and the cure to it.
The MRT scan of the head was done a year ago, not because of the ear, but I guess if something would look unusual - they would have noticed it..