That&#x27;s not new information.  You know that you will be in the experiment before the coin toss.  Information does not flow acausally.<p>To contrast with Monty Hall, after the MC opens the first door, you <i>do</i> have new information: you glean information from the MC&#x27;s choice, which he made based on his knowledge of where the prize is.<p>In this problem, the researchers take no action visible to you after the coin flip, and your memory is wiped before each new observation you can make.  So your knowledge about the flip&#x27;s outcome is exactly the same after it occurs as before: 50% chance.