The seizure visuals are a staple for electronic music in clubs. Some are programmed to frequencies, others to rhythms/patterns so that it's responsive to the song's progression.
Enlightenment seems to be the popular program for these visuals, and it's the one SM used, as the ones from the album preview video can be also seen
here and
here.
That SM used them for the album preview just shows that they're marketing the album as club-worthy, which fits in with SNSD's image in Japan as elite talent artists like Perfume rather than just idols. Smart!