clipped from: www.help4teachers.com   
One of the key parts of the brain which focuses attention is the Reticular Activating System (RAS). Located in a very low region of the brain, the RAS has the job of filtering all incoming stimuli and making the decision as to whether we attend or ignore something.

The one that plays the biggest role in the changing dynamic of the teacher - student instructional struggle is novelty.

Novel means unknown. And what is unknown demands to be known to the human brain. Once a new experience is known and understood, then we look to find another unknown to master.

Today's mind, young or old is continuously bombarded with new and novel experiences. Rather than novel opportunities every few days or weeks, we now have novelty presented in micro-seconds.

As teachers, how can we be expected to keep pace, let alone compete with this amazing pace. For a classroom using teacher-centered instruction, the task is nearly impossible.