Then, when we decide something and act, how do rationale and emotion interact with/on each other?

Which is better and why?

  • 1
    Normally you'd use interact with and act on.
    – Robusto
    Jan 23, 2017 at 3:44

1 Answer 1


As you probably know, use of prepositions is often arbitrary and idiomatic. One interacts with something but acts on or upon something. There's some rationale to this, since interacting goes both ways and acting doesn't.

However, you may find something like this:

They will interact on this matter tomorrow.

This is not an exception to the rule, because this is implied here:

They will interact with one another on this matter tomorrow.

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