Today, there are numerous versions of the continuous performance test (CPT)
used in clinical and research settings. Although CPTs may constitute a similar group of
tasks with a common paradigm, they are very different in the parameters they measure
(Conners, 1995). To learn more about the effects of different CPT versions as well as the
numerous scoring indices, two very different CPTs, the Connersâ Continuous
Performance Test-Second Edition (CCPT-II) and the Gordon Diagnostic System (GDS),
were compared with a population of children and adolescents exhibiting ADHD and
normal controls. Major findings were as follows: (a) the CCPT-II and GDS measures
were not able to separate children with ADHD from normal controls; (b) individual
variables from neither the CCPT-II nor the GDS were able to adequately differentiate
children with ADHD and normal controls; and (c) score profiles obtained from the
overall group of children and adolescents did not successfully separate the ADHD group
from normal controls using the CCPT-II and GDS