The idea behind AuthorRank is that your reputation as a content creator will influence the ranking of search results. Here’s the specific language from Google’s Agent Rank patent.
The identity of individual agents responsible for content can be used to influence search ratings.
Assuming that a given agent has a high reputational score, representing an established reputation for authoring valuable content, then additional content authored and signed by that agent will be promoted relative to unsigned content or content from less reputable agents in search results.
Agent? Agent is Google-speak for an author. This excerpt states that verified content by an author will be graded and it is that grade that influences the rank of content in search results.