This is the 11132nd most frequent Turkish word.
duyduğunun
"Of what you heard" or "that which you heard."
In this sentence, 'duyduğunun' means 'what you have heard' and is used as a relative clause referring to something heard.
Duyduğunun doğru olduğuna emin misin?
Are you sure that what you heard is true?
Here, 'duyduğunun' refers to 'the effect of the things that he heard', showing causative context.
Duyduğunun etkisiyle odadan çıktı.
He left the room under the influence of what he heard.
In this example, 'duyduğunun' is used in an investigative context, meaning 'the source of what was heard'.