The TOVA consists of two subtests: the visual test and the auditory test. These terms are self-explanatory: the visual test measures processing of visual cues while the auditory test examines the processing of auditory informa...
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... Jensen, Fraley, Heird & Rennie further examined the internal consistency of the TOVA with a larger sample. In this study, all of the participants were strictly diagnosed with ADHD as defined in the DSM-IV, for they met at least 5 of the 6 criteria. Moreover, while the coefficients were slightly less than those reported in the manual, the results are still illustrative of high internal consistency for the Visual TOVA. The fact that these coefficients were lower could be because of the differing means of obtaining a sample. The lab manual coefficients are based on normative data taken from a population of children without ADHD. Furthermore, the strict homogeneity of the Lorente et al. study may have had a negative impact on the observed correlations. It is important to note that the Visual TOVA upheld internal consistency within normal (non-ADHD) and ADHD data sets.
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