When Triss is silent, Her mother believes her small talk is okay ( Unconditioned stimulus). She then proceeds to bring up a embarrassing topic since the silence tells her it's okay ( Unconditioned respounse)
Triss never washes her hair...
COUGH COUGH COUGH
in response, Triss coughs. Not just any cough but a angry loud cough. This once Neutral stimulus has now been conditioned to the mother as she has said something that is not acceptable. ( conditoned stimulus)
Oh ( Uh oh must change )
The mother then reverts back to another topic not about Triss ( conditioned response ). She has associated the cough with bad conversation topics.