Talbot is fighting 10 counts of indecent assault dating from the 1960s to the 1980s, when he taught biology at Altrincham Grammar School for Boys in Greater Manchester, England, where Brown was a pupil.
The singer, who is not among Talbot's accusers, took the stand in court last month (Jan15) to testify that Talbot made his class watch adult films during lessons and encouraged students to masturbate.
Graham Ford, who attended Talbot's classes alongside Brown, has now challenged the star's claims and told the court their teacher addressed sex education in a "professional" way.
Speaking to Manchester's Minshull Street Crown Court via a video link from his home in Ohio, Ford said, "I sat next to Ian Brown in those biology classes. He was introverted and quite shy then... In our first year Mr. Talbot taught us the facts of life in a very professional, calm and respectful way."
When asked whether the boys were instructed to perform sex acts at home, Ford responded, "No, not at all."
He also denied pupils were shown adult films in class, adding, "It never happened and I never heard any other pupils talk about such a lesson. Nothing at all. It was a film about childbirth."
Talbot, 65, denies all 10 counts of indecent assault.
The trial continues.
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