Cognitive process of concentrating on one aspect of the environment. Selective (we decide consciously what to pay attention to while ignoring other things) vs. Non-selective (certain things in the environment forces us to pay attention to it often for the sake of our survival (attentional capture) Dichotic listening is where there are two messages being inputted through headphones, where one ear had one message and the other ear had a different one. They must attend to one and ignore the other. A lot of information on one end comes in, but only a small amount gets in via a filter. Humans can only attend to one channel of information at a time and they filter out other information. The diagram for filter theory is first information from sensors, then gone into the short- term store. This goes to the selective filter, in which once filtered will go to the limited capacity processor.