From what you wrote it sounds like he’s just thinking out loud…
sometimes you don’t even know it until someone points out that your doing it…
It may be a schizophrenic symptom: from what you have wrote I don’t think it is
“Symptoms of schizophrenia
Schizophrenia often starts slowly. When the symptoms first appear, usually in adolescence or early adulthood, they may seem more bewildering than serious.
In the early stages, people with schizophrenia may find themselves losing the ability to relax, concentrate or sleep. They may start to shut long-time friends out of their lives. Work or school begins to suffer; so does their personal appearance. During this time, there may be one or more episodes where they talk in ways that may be difficult to understand and/or start having unusual perceptions.
Once it has taken hold, schizophrenia tends to appear in cycles of remission and relapse.
When in remission, a person with schizophrenia may seem relatively unaffected and can more or less function in society. During relapse, however, it is a different story. People with schizophrenia may experience one or all of these main conditions:
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delusions and/or hallucinations,
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lack of motivation,
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social withdrawal,
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thought disorders.
Delusions are false beliefs that have no basis in reality. People with schizophrenia may think, for example, that someone is spying on them, listening to their thoughts, or placing thoughts in their minds.
Hallucinations most often consist of hearing voices that comment on behaviour, are insulting or give commands. Less often, people with schizophrenia may see or feel things that aren’t there.
Disorganized thinking makes some people with schizophrenia feel mixed up. In conversation, they may jump randomly from one unrelated topic to another. Depression and anxiety frequently accompany these feelings.
The symptoms of schizophrenia vary greatly from person to person, from mild to severe. A specialist is needed to make the diagnosis, especially because there are no diagnostic tests.”
Ref: http://www.cmha.ca/BINS/content_page.asp?cid=3-100