Final answer:
The speaker is building the speech using the use of logic, which is a method based on presenting evidence and research to support a conclusion. This logical approach, or logos, helps persuade the audience through reason. Other persuasive techniques include emotion and credibility.
Explanation:
Understanding Persuasion in Speeches
When a speaker convinces the audience by presenting a series of research studies that culminate in a specific conclusion, they are primarily using the use of logic. This technique is often referred to as logos, a persuasive appeal that relies on reason, facts, and evidence.
In the context of speeches, logic is crucial because it helps the audience understand the foundation of the argument being made. For example, if a speaker discusses a health issue, they might present studies demonstrating the effects of a particular diet on health outcomes, thereby leading the audience to logically conclude that the diet is beneficial.
In contrast, other approaches such as the use of emotion (pathos) invoke feelings, while the use of credentials (ethos) relies on the speaker's authority or expertise to gain trust. Using logical arguments is effective in persuading an audience and is a fundamental strategy in public speaking.
Learn more about persuasion here:
https://brainly.com/question/44135855