optical illusion: black and white photo turns to color!

I watched a video of an optical illusion. In the video you see a black and white picture, then you stare at a heavily color saturated picture for about 30 seconds. After staring, when you look at the black and white photo you see it in color! This happens because of the over stimulation of the cones in our eyes. So when staring at the color saturated picture our neurons were firing rapidly. However, when we switched to the black and white picture it cause us to see the inverse colors of the saturated picture!

https://www.youtube.com/watch?v=3P8q_dCU3RI