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Did you know some research indicates that brain activation when identifying letters is influenced by previous handwriting of letters?  Researchers at Indiana University have published several research articles on visual perceptual skills in children.  One article that was published in Trends in Neuroscience and Education examined 15 preliterate, right handed children (ages 4.2-5 years old).  During functional MRI scanning, each child was shown a letter or shape on an index card and asked to draw, trace or type the item without it being named by the experimenter.
The following results were recorded:

1.  after self-generated printing experience, letter perception in the
   young child recruits components of the reading systems in the
   brain more than other forms of sensori-motor practice (tracing or typing).

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