Two studies are reported which explore the possible relationship betwe
en academic failure, as measured by grade retention, and the capacity
to sustain attention on a computerized continuous performance task. In
a nonreferred sample, 89 children who had been retained at some point
in their academic careers showed a higher frequency of abnormal score
s on an index of sustained attention than did 93 children who had neve
r repeated a grade. In a sample of children who had been referred for
an evaluation of Attention-Deficit Hyperactivity Disorder, children wi
th a history of grade retention had significantly lower scores on the
same measure of sustained attention. Results are discussed in terms of
the possible contribution of attention deficits to over-all academic
achievement, even for children who have not necessarily been referred
for a clinical evaluation.