its both really. your nature determines how you might initially react. the way you were raised, the nurture, may detemine how you would react after a few minutes of thinking about something, after you calm down or have time to think about something.

theyve done numerous experiments on primates with this kind of thing.
like one experiment they did with baboons and different sounds of snakes and other predators.

one group had been exposed to snakes and the sounds of other predators, and when a tape recording was played of those sounds, the whole group got into a panic and huddled together for protection.
the next group, which were from the same family, but had been seperated from the original group, were never exposed to these sounds until the experiment. the recording was played, and the baboons showed no reaction what so ever.

same family of primates,(nature), different environment,(nurture),different reaction.

and this of course applies to us, because were primates.

__________________
jesus had a great publicist