There is a good article at Moz Blog about related wit Infographics. moz . com/blog/how-to-build-links-with-infographics I hope, It will be useful for you.
Now in SEO infographics is a effective part. It will help u to increase your visitor. If you add infographics to your Article it will be rich and attractive.
I honestly think they only way that they do help is if you link them. Really think about it. The last three infographics that you saw.. who made them? There's an interesting article about that on search engine land I think. not positive about the venue.-- the bottom line was the info-graphics in and of themselves are interesting and attractive, but typically not memorable enough to make you remember who actually did the infographic that you saw and admired so much.
The main purpose of Infographic in SEO is not the traffic nor the backlinks but to help the targeted audience guide them with the content by using interesting infographic (content and flow of images) this is a sign of great user experience. Visitors will trust your site and they will possibly share your stuff to others.
#7 Information graphics or infographics are graphic visual representations of information, data or knowledge intended to present complex information quickly and clearly.They can improve cognition by utilizing graphics to enhance the human visual system’s ability to see patterns and trends. The process of creating infographics can be referred to as data visualization, information design, or information architecture. for more information go to wiki
In other words, Infographics help visualized your website services or articles or other information about your website to your targeted audiences.