The current study examined the psychometric properties of a hypothetical visuoperceptual-orthographic (VPO) reading construct in a sample of nonimpaired college students (N = 152). Participants were administered a battery of standardized and experimental measures of VPO, including Woodcock-Johnson III (WJ-III) Letter-Word Identification (Woodcock, McGrew, & Mather, 2001), Visual-Naming Speed (word page of the Stroop), Letter-Identification Task, Same/Different Letter Decision Task, Word Matching Task, Homophone Decision Task, Pseudohomophone Decision Task, and Word Jumble Task. The LISREL 8.54 computer program (Jöreskog & Sörbom, 2003) was employed for confirmatory factor analysis to assess the tenability of a multifaceted, unitary VPO reading construct. Goodness-of-fit statistics indicated that VPO is a hierarchically organized construct with one 2nd-order factor (i.e., VPO) and three 1st-order factors (i.e., perceptual processing speed, prelexical accuracy, and lexicosemantic accuracy). Alternative models were tested but produced unsatisfactory goodness-of-fit statistics. Altogether these findings are in agreement with those of previous cognitive and neuroscientific studies and further support the notion that VPO should be viewed as a unique factor in the assessment, diagnosis, and remediation of developmental dyslexia.
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