Difference between conditioned and conditioning variable?

Is there any technical difference between a conditioned and conditioning variable?

E.g. see below picture

Can I call both X and Y conditioned OR conditioning?

Thanks

• Could you explain what you mean by "technical difference"? After all, there is an obvious prima facie difference that most people would understand as being "technical": $X$ is the conditioning variable and $Y$ is not! Please be aware, too, that this notation has at least two distinct uses (technically): they differ according to whether $(X,Y)$ is a random variable or $X$ is a parameter (and might not be random at all). Which do you have in mind? – whuber Mar 16 '18 at 15:43

• I see that I misunderstood your meaning of "past tense." Thank you for clarifying. However, it isn't apparent this answers the question, which concerns some kind of (vaguely expressed) difference between $X$ and $Y$. Are you asserting the variables play equivalent roles or not? – whuber Mar 16 '18 at 16:36