Hallo!

By the sphere of communication we mean the circumstances at-tending the process of speech in each particular case: professional communication, a lecture, an informal talk, a formal letter, an inti-mate letter, a speech in court, etc.
A clinic for such patients can also be discreetly referred to as, for instance, an asylum, sanitarium, sanatorium, (mental) institution, and, less discreetly, as a nut house (sl.), booby hatch (sl.), loony bin (sl.), etc.
bye-bye!