Hey Niactz: this is called conditionated reflect. as you repeat an action asociated with a soun, image or thought your brain sells will develope bridges and one of them will take you to the other.
as avatar for WeaponsMaster says, pavlov used dogs ringing a bell as he feeded its dogs.
if you eat a litle life when it's being parasited the parasite gets head-cutted and then it glows in green and the game tilts like pimball when you hit it with a one.tone hammer
good grafics, seems someone owned poser+3d max.
the game and story line are lame, but you can't ask for perfection.
Could say this is Disney style (lame storyline, enworked grapsh)