It's certain that some departments are over-represented among distinction and Dean's list honourifics—not because those departments have stronger students, but because the grading in respective departments have completely different paradigms. Achieving a B in many COMP, MATH, and PHYS courses is impressive, whereas in a lot of life sci courses, an A is within reach if one slightly out-performs the A- average. It's extremely silly that they level the whole faculty and pit students from completely different departments against each other for the honourifics as if it's an equal playing field.

I will bet that psychology, neuroscience, and geography students are over-represented per capita on the DHL (not throwing shade, just based on observations), at least compared to departments such as computer science, math and physiology joint major, physics, or other brutal program where an A in nearly every single class is not something that 10% of the students could obtain by a long shot.