This blog post by Stephanie Evergreen demonstrates how to ensure that presentation slides introduce the components of complex graphics one at a time. She provides a step-by-step process for using the slow reveal technique for graphs used in PowerPoint presentations.
"Over here I talked about how important it is that we gradually introduce components of complex graphics – one-at-a-time – so as not to overwhelm the visual field and working memory of our audience members. We don’t want to slam our content in their faces all at once. It let’s the audience read ahead and only half-listen. It can also be so much information at one time that audience members check out entirely." (Evergreen, 2013)
Evergreen, S., (February 13, 2013), Presenting graphs with slow reveal, retrieved from: http://stephanieevergreen.com/presenting-graphs-with-the-slow-reveal/?doing_wp_cron=1395885902.5320620536804199218750