Abstract
One of the main cognitive abilities is visual processing. Although much is known about the components of visual processing, current assessment instruments do not adequately measure these components in a manner that is useful in the applied setting. In particular, most instruments fail to isolate visual processing from other forms of processing, measure only one component of visual processing, and are inappropriate for group administration. Therefore, a new measure of visual processing is needed that overcomes these limitations. TRIO was developed specifically to fill the gap. This article presents a description of the development of this instrument and the psychometric and normative data obtained on it.
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