Sounds like learning...

So,ifIweretotalklikeyouaretryingtoreadthis, no one would understand a thing I was trying to say! Well, for some children that have a difficult time listening and paying attention, differences in speech acoustics can be just as hard to understand as the mash of words at the beginning of this post. So really the stubborn toddler may not be trying to drive you crazy- they just don't get what you're saying!

Photo From NEWPARENT.COM

According to a study by Nina Kraus, Therese McGee, Thomas Carrell, Steven Zecker, Trent Nicol and Dawn Koch of Northwestern University and the University of Nebraska studied the affects of problems discriminating "rapid acoustic changes that occur in speech."
In their study they found that some of the problems may be caused by defects in the auditory pathways (affected by the nervous system) before the child can consciously interpret what they are hearing. Specific therapy programs may be able to help bridge the miscommunication: "previous research shows that speech-sound perception can be modified by training".
Learning more about the specific acoustic disturbances could lead to specialized treatment plans to assist children with ADD and other learning and attention disabilities.

With a family member that teaches at the elementary school level its very easy for me to imagine the amazing benefits the proposed therapy treatment could have in a classroom. With growing class sizes and drastic changes in demographics and attitudes towards school,  streamlining classroom focus and taking a little extra time to encourage learning ability certainly wouldn't be a bad thing!