Theoretically, could this sentence be correct when talking about a person with schizophrenia?
"he/she is talking to each other"
I suppose 'herself' or 'himself' would be the better word to use instead of 'each other'.
Just a thought.
Theoretically, could this sentence be correct when talking about a person with schizophrenia?
"he/she is talking to each other"
I suppose 'herself' or 'himself' would be the better word to use instead of 'each other'.
Just a thought.
Putting aside the question of medical accuracy, the short answer is that the grammatical correctness of an expression is not going to depend on contingent medical facts. "He/she is talking to himself/herself" is grammatically correct (and often applies to perfectly normal people). "He/she is talking to each other" is not.
That said, sometimes speakers or writers intentionally use a jarring or ungrammatical phrase to draw attention to an unusual phenomenon, and the "individual as a collection" is such a phenomenon. My favorite such phrase is "I debated amongst myself". Even when phrases like this aren't outright ungrammatical, they're very jarring to a reader, and should be used only when that effect is specifically desired.
If you wanted to express this idea comprehensibly in English, you could say:
He is talking to his other self
(or "his other selves"). Or maybe even
he is talking among himselves.
But "he is talking to each other" is not going to be understood.
As the example is semantically unsound in general (see below), it is still so even if you are attempting to talk about a person with schizophrenia.
Presumably he/she denotes one of the terms he or she, which is singular, while "talking to each other" presupposes a plural subject.