updated 3/1/2012 11:24:47 AM ET 2012-03-01T16:24:47

In the weeks and months following a tragedy like this week's school shooting in Ohio, experts and lawyers and school psychologists and classmates will try to make sense of the actions of the 17-year-old suspect.

In all likelihood, though, no one will ever be able to pinpoint a single reason, said pyschologist David Walsh, author of "Why Do They Act That Way? A Survival Guide to the Adolescent Brain for You and Your Teen."

"There are usually multiple factors that take a long time to sort out," Walsh said. "It's irrational, so looking for a reason can be somewhat frustrating. There are many kids who probably share that profile who don't do anything remotely like what he did.

Science, however, can shed some light on how he and other teenagers think.

NEWS: Teen Brain Wired to Take Risks

"Adolescents can make good decisions," insists B. J. Casey, a neuroscientist at Weill Cornell Medical College. "They can make better decisions than you or I. But it is in the heat of the moment that they get into trouble."

That's because the reward-sensitive areas of the brain are maturing with the onset of puberty. There's been a long-held view that teens make poor decisions because they don't think through consequences. Since the 1990s, we've known that brains go through extensive development in adolescence.

Myelin, or white matter, provides more insulation and boosts the ability of the axons to send signals faster. New connections are being made in the frontal cortex and older ones are dying.

WATCH VIDEO: See how thoughts are transferred in a teenage brain.

But new research shows that understanding the consequences of decisions isn't exactly the problem: In emotionally neutral situations, teenagers take risks similarly to adults. And if it were simply the matter of an immature brain, children would make worse decisions than teens, Casey said. But they don't.

What throws teens off is the reward for taking a risk. And since teens are so tuned into their peers, showing off for friends is perceived as a huge reward.

"Basically, they can make pretty good judgments and decisions in cold situations that don't involve emotions or rewards, but in the heat of the moment their decisions tend to fall apart," Casey said.

HSW: Dealing with Your Teen: A Parent's Handbook

Take the research of Laurence Steinberg, a professor of developmental psychology at Temple University: When he watched teens and adults play a video game in which you try to drive from one end of town to the other as quickly as possible, he noticed the teens chanced running red lights at about the same rate that adults did.

But when he brought the teenager's friends into the room to watch, the teens tried to gun it through the lights -- taking twice as many risks as they did in an empty room. The adults drove the same with onlookers.

"It is very difficult for a 16-year-old to resist peer pressure in a heated, volatile situation," Steinberg said in a press release after one of his studies. "Most times, there is no time to talk to an adult to inject some reason and reality to the situation. Many crimes committed by adolescents are done in groups with other teens and are not premeditated."

NEWS: Window Installed into a Live Brain

Another study showed that teens use different areas of their brains to perceive emotion.

When scientists at the McLean Hospital in Belmont, Mass., showed a group of teenagers and a group of adults pictures of faces, the adults correctly identified the emotion in the pictures as fear.

The teens' answers varied...and, because the scientists were watching the brain activity of the subjects through functional magnetic resonance imaging, the researchers could tell the teens were using the amygdala, a small region of the brain that's known for gut reactions, whereas the adults used the frontal cortex.

Here's where parents might wonder why on earth the brain would be programmed that way during adolescence. Casey, herself a mother to a 17-year-old boy, has spent a lot of time pondering that question, and has developed a theory of adaptation. When kids are young, parents act as their prefrontal cortex, she said. As teens venture out into the world, that has to change.

"The reason we think this is going on," she said, "is that you reach puberty and you need to go out and find a mate and other resources, and something's got to pull you out of your comfortable environment. It's a period of time where they need to learn how to be able to adapt to social pressures; to test the waters."

What, then, can parents and schools do?

Turns out that locking them up until they're 21 is not the right thing to do, Casey said. When her son was hitting puberty at age 11 or 12, she remembers him coming in the door from school shouting a torrent of inappropriate words.

"I was so taken aback I couldn't say anything," Casey said. "He stomped up to his room and I cooked dinner. An hour later he came down and nudged up against me as if to say, Are you really going to feed me after that? I said, You had a rough day, huh?"

That cooling off period can be essential, and it can come in a variety of forms, Casey said: a text message from a parent, a relaxation or yoga break in a classroom -- "just giving them a minute to take it down a notch."

She's implemented a new rule at her house: her son and his friends must replace profanity with words like "intercourse" or "poop." "It's just enough so that when a heated debate gets emotionally charged, they start laughing," she said.

While teens are primarily in tune with their peers, they do need -- and even want -- their parents to set limits, Casey said.

Walsh has noticed a shift in what parents are worried about.

"It used to be, 30 years ago, most parents would worry about their kids being a victim," Walsh said. "That's still true, but a growing number of parents worry that their teen could be a perpetrator."

The warning signals are always easy to see in hindsight, he said. In the case of the Ohio shooting suspect, there were several red flags: he came from a troubled home, had behavior issues and he was exceptionally quiet.

Finding a way to draw those kids out could help, Walsh said.

"It gets to be more challenging as we've made our high schools bigger and bigger and easy for kids to disappear," he said. "We really have to start to figure out how to help kids from becoming anonymous."

© 2012 Discovery Channel


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