I feel like basses are more audible to the left ear than to the right, whereas the higher-frequency sounds are more audible to the right rather than the left. I'm not sure if this is scientifically proven to be true or false, but it's what I've experienced so far.
I think it's safe to say that our hearing is visualised as left-to-right (such as the EM spectrum, or to be more exact, a piano). I have no clue as to whether our brain detects and analyses sound frequencies like this by default or it has to do with what we perceive pitch progression so far as to indoctrinate ourselves with it (for lack of a better word).
Although very minute, it is still noticeable (most effective: headphones, earphones, or any of the sort). Try listening to a song. You will (or won't) find that the bass is leaning more to the left just a tad bit. Good luck experimenting ya?