Yeah making excessive noise from running, or even walking (depending on the difficulty level? ) draws attention to you. Plus the motion sensor's beeping also draws attention to you. Don't forget, the alien can move over above you then stop, so nothing will appear on your sensor. I also read somewhere that if you pay attention to the ceiling vents/ducts and see ooze coming out of one, then the alien is waiting for you to walk under it andGame pisses me off!
I passed that part where there's like 5 Androids walking down the hall and finally got to the Elevator. I step out the Elevator and walk up the stairs scanning shyt to make sure no one is there. So I keep walking and I notice the scanner keeps vibrating but no one is in front or behind me which was weird but i was like fukk it then i hear some pipes making noise and all of a sudden i hear the fukking Alien behind me screaming now i have to go pass the Androids again
I haven't tested this though