Attempting two tasks that require the same type of thinking causes one to suffer.
Think you are really good at multitasking? Think again! Researchers tested students' ability to memorize letters and perform math calculations at the same time. The 25% of the students who did the best on the test were the least likely to actually multitask in life. Contrary to these findings, 70% of these students thought that they performed above average in multitasking.
PositiveTip: Focus on one task at a time. In most cases, you will be more efficient.