The release of chemicals into our brain and body creates an altered mental state in which we both perceive and behave differently than we normally would.While no individual substance can single-handedly control your brain, here are just a few of the different chemicals swimming through your brain when you see a pretty person, and how they affect you: Adrenaline: When you see someone you're attracted to, your body releases adrenaline into your system.Adrenaline is what's responsible for causing your heart to race or your hands to sweat.

It's also likely to cause even the most rational, level-headed people to make really dumb decisions. Biologically speaking, however, there are a host of different chemicals that contribute to an altered state of mind when someone catches our eye.

There are a ton of different variables that affect how much we're attracted to someone including personality preferences, cultural trends, societal pressures, and available potential partners.

Scientifically speaking, human attraction is still a pretty big mystery.

In a very real way, being attracted to a person is a lot like being on drugs.

This is beneficial in (hopefully) positive romantic relationships, but it also affects negative behaviors like cravings and drug abuse.

In other words, when you're infatuated with someone, your body is rewarding you with feel-good chemicals, whether or not it may be a good decision.Serotonin: When you can't seem to get someone out of your head, serotonin is usually to blame. This same drop in serotonin creation is present in people with Obsessive Compulsive Disorder.In other words, being infatuated with someone causes a similar chemical state to a condition that would otherwise be treated in a professional setting, surprising no one who's ever watched a romantic comedy.Testosterone: The levels of testosterone (which fluctuate regularly) affect attraction in both genders.Higher levels of testosterone in men was found to cause them to be more attracted to women with more "feminine" faces.On the other side, a study showed that women found men with high levels of testosterone to be more attractive and masculine, though this primarily affected short term mate judgments.