Thinking without language

I found an interesting article on physorg. It's called "Monkeys might be more logical than we think". Here's an excerpt:

The implications of these findings are broader than the lives of baboons. Says Fagot: “The real question is ‘What is thinking without language?’” Without words, can creatures process the things they see and accomplish cognitively challenging tasks? These brand-new findings, he says, “suggest there is thinking without language.”

I've wondered about this over the years. It seems to me we often think without language. It's not like we're constantly talking to ourselves while we're alone. We simply do things and think of things and words don't enter the picture -- at least, at times. The question is: can we do something mentally challenging without words? Is that possible? It's interesting to consider, isn't it? (And no, math doesn't apply. It has its own language.)

So tell me. Do you think in words all the time? And does this extend to complicated tasks?