Here’s what you’ll learn when you read this story:An experiment reveals that our vision lags up to 15 seconds behind real time. Our eyes smooth out how we see the world, but scientists don’t fully understand how. Scientists say this exercise is a close approximation of the messy visual data that our eyes constantly bombard our brain with. “Serial dependence causes objects at any moment to be misperceived as being more similar to those in the recent past,” the researchers explain. This means our brains are capable of smoothing out images that are as old as 15 seconds ... or possibly even older.