Human-chosenm pseudo random variables that are not really random?

we're all familiar with not really random, human-chosen variables such as the disproportionate appearance of 37 when humans are asked to choose a number between 1 and 100, and for other cases (disproportionate selection of a particular one of four quadrants of a 2x2 grid, etc). I'm sure I'd once read that these are called "[something] Variables."

Can anyone please provide me with the term for these variables? Many thanks!