Here's your brain at the movies. When you watch a movie, a whole lot goes on.
Natural scene experiments are more complicated to analyze, but they are more like real-life. In real life, people, their movement, words, colors, and objects all impact on our senses at once, and we have the task of making meaning (or not) of the experience.
This kind of complexity is a good reminder to cut kids a break when they get distracted by classroom clutter on the walls, whispering classmates shifting in their seats, or sounds out in the hall. It's one thing to take all this information in at once, but it also takes practice to group and prioritize what you see and hear.
The figure below also shows how much individual people's reports of the intensity of their experience(for instance, how much they noticed colors, faces, etc.) correlated with brain activity levels by fMRI (BOLD signal).
When we watch movies, we don't see, hear, or experience the same movie.
fMRI at the Movies