This study is a good reminder to us that writing is rarely 'automatic'. When University students had to do other tasks at the same time (like making nonsense sounds or tapping) they made multiple errors like omissions, grammatical mistakes, repetitions, and substitutions. It was interesting too that there were different patterns of errors between the two conditions.
These interference effects may play some role in the dysgraphia of dyslexia. Some writing errors may occur because of students'increased demands of the phonological loop or the sensory-motor systems for writing by hand.
Writing is Not Automatic