It happens when I am deeply focused at something, or I’m completely in my own thoughts, that I tell or ask somebody around me something particular about the subject I am into, but totally forget to give any context regarding this matter. E.g. «Do you know if it has more of an effect at higher altitudes?», where the omitted context could be consuming alcohol.
Is there a word for this, a saying or anything that explains this more specific than my attempt at explaining above.
I want to emphasize that in my question, the omitting of context is unintentional, and an obvious oversight by the questioner on second thought.