I'm left-handed and an S, without a doubt. I assume this was taken because of handedness and the prominent hemisphere being used typically being opposites (left-handed people typically being right-brained with intuition and a right-handed people using the left hemisphere of logic). However, this does not always hold true. My human cognitive processes professor discussed this saying that for left-handed people if they completely turn their paper sideways while writing then they do not use an alternating hemisphere and are most likely left-brained, sticking with logic over intuition the majority of the time.
I don't have excessive data to prove this but with myself as evidence all left-handed people are not Ns, lol. Also, I'm nowhere near ambidextrous, I've used my left-hand for pretty much everything since I was a few months old, according to my parents.
Also, Ns and Ss can both fall anywhere as far as intelligence goes. The thing with Ss is that we are still capable of understanding the theories we're presented with but we're not going to go with them alone...we are probably going to remain skeptical until convincing evidence is presented. I know that personally I'm also a type 1 as far as the Enneagram, and if you need to know one thing about 1s it's that we are perfectionists and we do not like to be wrong...so I wait for evidence to surface before I jump on an intuition or emotion.
Haha, sorry, I got on a bit of a rant there...