http://youtu.be/4TnltTxRKpw
The meaning of a signal has been obtained by certain experiences and circumstances that a stimulus has been connected with in the past. This experience is what made a stimulus into a signal. We call this process training!! Signals are an important subject.
Different behaviors can be performed on certain signals, verbal or visible, or both combined. Once an exercise is performed in response to a signal (specific stimulus), it is under signal control.
This dog in the Video clearly learned that the meaning of opening the door does not mean to come in but to lay down and to wait for either a reward or an upcoming next signal like – come on in!
