What's the difference between spontaneity and impulsion?

Spontaneity allows for freedom to do as one chooses at the drop of a hat. It could be a considered choice, or not. I think of impulsiveness (which I think is the form of the word you’re talking about) as doing what one chooses without considering the consequenses.

Official explanations from dictionary.com:

Spontaneity is a natural impulse or tendency; without effort or premeditation; natural and unconstrained; unplanned.

Impulses are sudden, involuntary inclinations prompting to action.
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In my own words, I’d have to say that spontaneity is a completely unexpected action that comes out of nowhere while an impulse is an urge to do something, and although involuntary, may have been first caused by a catalyst of some sort.

I have the sudden impulse to lurve @augustlan because her answer is better than mine.

Spontaneity is the positive spin to Impulsiveness.

I like that hungryhungryhortence