Purchase this article with an account.
S.S. Block, E. Berry–Kravis, S.J. Guter, Jr, S.E. Krause; Evaluation of IVA in a Population of Fragile X and Autistic Patients . Invest. Ophthalmol. Vis. Sci. 2005;46(13):4595.
Download citation file:
© ARVO (1962-2015); The Authors (2016-present)
Purpose: The IVA is an auditory and visual continuous performance test created to diagnose ADHD. It was standardized on subjects aged 6–96 years. Exclusion criteria included individuals with neurological diagnoses. This study investigated whether the IVA could be administered to patients with Fragile X and autism and if possible, to develop normative data in this select subject pool. Methods: Forty–eight patients (18–49 years of age) with a diagnosis of Fragile X (36), Fragile X/autism (6) or autism (3) were administered the IVA. All subjects were able to complete the task. Results: The range of raw scores was auditory: 4–125 (mean 68.7 ±41.1) and visual 6–119 (49.0 ±34.8) with high omission/commission mean responses – auditory 40.8(±36.7)/44.4 (±40.8) visual 60.4 (±34.8)/38.3 (±34.3). Higher visual to auditory responses were seen in 75% of the subjects. Males (n–39) had slower mean reaction times than females (n–9) for auditory (males: 764 msec. ±170.9, females: 686.44 msec. ±65.5) and visual (males: 726 msec., females: 624 msec.) stimuli. Comparing intelligence scores with raw scores reflect a correlation (p<.005) with auditory but not visual scores. Conclusions: The validity of the IVA in this subject population is questionable based on the normative data. The IVA raw scores, omission errors, commission errors, and mean reaction time appear to be more appropriate measures for this group keeping in mind the large range of capabilities and responses in this subject pool.
This PDF is available to Subscribers Only