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Aspartame and attention deficit disorder (ADD)

In a recent article Shaywitz et al conclude that aspartame at greater than 10 times usual dose does not affect the behavior and cognition of children with attention deficit disorder (ADD). Accardo and Lindsay note that the study refutes an effect of aspartame on behavior.
 This study has a type II statistical error. A study of this size cannot answer the question of whether aspartame affects the behavior of children with ADD. The authors chose a group of children who possibly would be more sensitive to aspartame than the general population, but it is unknown if any of the children were sensitive and likely to respond adversely to the aspartame.