Final answer:
Campbell and Burkholder focus on the study of rhetoric related to persuasion strategies and their use in everyday communication and academic conversations, drawing from both classical and contemporary contexts.
Step-by-step explanation:
Campbell and Burkholder study the type of rhetoric associated with persuasion in communicative situations. This encompasses both the classical rhetoric that dates back to ancient Greece and more contemporary forms, such as those found in academic conversations or within digital media like social media platforms. They examine how language is used to persuade and the various strategies that can influence people's opinions and actions.
Within their studies, they might refer to Kenneth Burke's metaphor of an academic conversation as an 'unending parlor,' where ideas are continuously discussed across time. Their focus on rhetoric also includes how everyday communication, including non-verbal cues like facial expressions and tones of voice, can be analyzed for their persuasive elements. Ultimately, they look at rhetoric in practice, not just to persuade the crowd but also to understand practical knowledge and the human condition.