What type of testimony can strengthen the validity of a speaker's claim?

Expert testimony is a powerful tool in public speaking because it involves the insights and opinions of individuals who possess specialized knowledge or credentials in a particular field. When a speaker incorporates expert testimony into their claims, it adds a layer of credibility and authority to their argument. This is particularly effective in persuading the audience, as it reassures them that the information presented is based on sound evidence rather than personal opinion or anecdote.

Utilizing expert testimony allows the speaker to draw upon well-researched and validated information, which reinforces their position and may influence the audience's perception positively. In contrast, generic opinions, unverified anecdotes, and self-references lack the same level of validation and authority, making them less impactful in supporting a speaker's claims. Therefore, expert testimony not only enhances the validity of the argument but also helps establish the speaker's credibility and fosters trust with the audience.