Before revision:  Concepts (words ) are then cognitons in different energy states as it is the case for photons in different energy states,  states of different frequency radiation , when the considered boson gas would be light .
After revision:  Concepts (words ) are then cognitons in different energy states as it is the case for photons in different energy states, states of different frequency radiation , when the considered boson gas is that of the quanta of the electromagnetic field .