From the “Functioning Form” blog:

At VizThink 2009, Tom Wujec outlined Why Visualizations Work with an overview of how the human brain manages visual information and how pictures can help drive deeper understanding of complex issues and information.

He’s got a great bullet-list of reasons (mostly Human Perceptual system points) why Visualization works, and a link to AutoDesk’s TED presentation.

via Functioning Form – VizThink 09: Why Visualizations Work.