Dyscalculia: News from the web:
Smart people at the Linköping University have found out that the brain really focusses only on one thing at a time. So if you are doing one thing, chances are that the brain will reduce some other activities.
The results show that brain activity in the auditory cortex continues without any problems, as long as we are subjected to sound alone. But when the brain instead is given a visual task, such as a written exam, the response of the nerves in the auditory cortex decreases, and hearing becomes impaired.
Read all about it HERE