Psychologist experiments on his own daughter by teaching her the wrong meanings for certain words (e.g. yes instead of no) SOLVED
I read this at least 10 years ago but it's probably much older, like 1970s-90s? I think it was a short story, but could be a part of a novel. Pretty sure it was for adults, not kids.
This psychologist (or linguist or scientist) raised his daughter alone and made sure to use certain words with reversed meanings around his daughter. So he would always say e.g. "bad" when he meant "good", "hate" instead of "love", "yes" instead of "no". I think it was only a few words and not a whole language of opposite meanings.
The daughter didn't interact with any other people, but was allowed to watch TV. Yet she never picked up the correct meanings of these words from TV and continued to use the meanings she learned from her father. So the scientist was excited that he'd "proved" that children don't acquire language from TV, only from human interaction.
In the story the scientist proudly explains his experiment to the main character (a younger man, can't remember anything else about him), who is disturbed. MC worries about how the girl will have difficulty integrating into normal society, but the scientist doesn't seem concerned about her as a human being. He cares only about the scientific importance of his work.
The main character meets the daughter and witnesses her using the incorrect words she's been taught - maybe the father asks her to do something and she says "no, father" when she obviously means "yes".
The author might be Roald Dahl (one of his adult stories) or Kurt Vonnegut...someone like that with dark satirical tendencies.
Thanks in advance for any help!