Roaches may be dirty, nasty disease carrying bugs that appear to survive given just about any circumstance that would otherwise be thought of as the harshest of conditions where even humankind couldn't survive. So you may be surprised to learn roaches have devised their own form of survival skills given a situation they feel puts them in danger.
Roaches aren't really dumb. They are quick to learn and adapt and they do it quite well. You may have noticed that when you swat at a roach or spray it on a wall, a cabinet, the side of a chair or anywhere the bug is hanging or walking on at an angle it quickly drops to the ground. This is a defense mechanism. To the roach letting go and falling to the floor is a chance to get away. If they hung on they figure they would get flattened for sure.
Another defense mechanism of the roach is the act of playing possum. Suppose that you hit the roach with a mop-stick and you think you have killed it. After all it has flipped over onto its back with its legs in the air and it isn't moving. You go to get a paper towel or a broom and dustpan to get rid of the bug and when you return it's gone.
Roaches use offense as a means of defense too. Similar to the way a football player plays offense during a ball game. They will face you down and run straight toward you. If you are already squeamish over roaches your reaction might be to turn around and run. Roaches will sometimes fly at you. Usually if a roach flies it has to do more with the weather than you.
Roaches use movement as a defense. By watching you they can tell if they need to run or if they have nothing to worry about. They also watch moving shadows. If you try to slowly creep upon a roach and your shadow passes or stops over it then the roach prepares to run or goes ahead and tries to make an escape.
One of the biggest defenses a roach uses to avoid having to use its other defenses is hiding. They love to hide in cabinets, pantries, clothes, and in-between cracks. They will hide in walls, under the sink and around the water heater. They will even hide under sofa cushions. Anywhere that it's dark and they can hide in the shadows.
An Entomologist said that cockroaches can't see you. Roaches try to avoid air currents: if they sense the wind on their back, they will flee. They will also avoid light, and seek protected nooks. If the closest nook happens to be the shade under your sneakers, they will try to crawl under there because they can't understand that your shoe is a part of you, the big thing that turned on the light and made air currents and vibrations and scary things. It doesn't help that roaches can't always see above them: their heads are protected by their pronotal "shield," so they can see a bit in front of them but little or nothing above them or behind them the way flies do.
http://www..com/2013/04/why-do-cockroaches-run-after-you-when.html?m=1
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