The present study explores the construct and ecological validity of
the Biber Cognitive Estimation Test (BCET) in a traumatic brain injury
(TBI) sample. Participants completed the BCET in the course of a
neuropsychological evaluation at 1–15 years after injury. BCET
scores correlated moderately with other standard measures of executive
functioning, and contrary to our hypotheses, at least as high with
neuropsychological tests with minimal demands on executive functioning.
Moreover, partialing out the portion of BCET variance not attributable to
executive functioning markedly attenuated the former correlations. With
respect to ecological validity, BCET scores did not predict concurrent
functional status, as measured by the Disability Rating Scale. By
comparison, standard measures of executive functioning strongly correlated
with each other, correlated less strongly with nonexecutive functioning
measures, and predicted functional status. In conclusion, unlike standard
measures of executive functioning, the BCET demonstrated poor construct
and ecological validity in TBI patients.(JINS, 2007, 13,
898–902.)