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A new study observed how drivers coped when distracted by various things

The results indicate that the worst kind of distraction may be checking your phone

The "fight or flight" center of your brain requires hand-eye coordination

Whether it’s kids squabbling in the back seat, work stress, or your phone constantly pinging, countless things can distract you when you’re driving. But are certain distractions riskier than others?

That’s what researchers from the University of Houston and the Texas A&M Transportation Institute wanted to find out. In a new study (funded in part by the Toyota Class Action Settlement Safety Research and Education program), they observed how drivers coped when distracted by absentminded thoughts, emotions, and text messages.

The authors noted that while many studies have explored the dangers of texting and driving, there’s less research on how other kinds of stressors can affect your behavior at the wheel. But their results indicate that the worst kind of distraction may indeed be checking your phone.

The researchers found that people who drove while absentminded or emotional benefitted from a “sixth sense” instinct that helped them navigate safely. Meanwhile those who were texting while driving did not experience the same protection.

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For the study, 59 drivers navigated a simulated stretch of highway four times: once under “normal conditions,” once while they were asked cognitively challenging questions (think math problems), once while they were asked emotionally charged questions, and once while they were distracted by texts. Each time the researchers measured the sweat under the drivers’ noses (an indicator of their stress level), how jittery their steering became, and whether or not they drifted out of their lane.

The three types of distractions all increased the drivers’ perinasal perspiration levels, and caused them to be more jittery. But when the drivers were asked cognitively challenging and emotionally stirring questions, they were able to maintain a straight course; while texting led them to veer out of their lane.