It is not enough for a user to just ‘think about speaking’. The user has to produce some physical signal which is what we term as a control signal. There are different examples of producing this control signal, two of which are mentioned above. Another easy way to produce a signal is to swallow. This helps a user to initially learn how to produce a signal. To start with this might be an easy enough method, but going down the line this is not the best way for continued use.