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I'm a junior dev in Japan and sometimes I need to talk to a senior engineer when I run into tasks that I may not be able to complete or whenever I have a question he would be the best source to answer them.
He talks to himself about everything. e.g. He finishes a task "finally im done!! yeah!" then looks around, usually at me.
Usually I just ignore this sort of thing but it gets to the point where he asks me to do something, I do that something and get him to check. He would then mutter "what the fuck is this lol" (usually laughing out loud)
How can I confront to him about his habit of talking to himself in a professional way and not appearing emotionally intimidated by his behavior?