Psychometric analysis of the visual form discrimination test

The Visual Form Discrimination Test is a matching-to-sample test involving visual discrimination. Although normative information has been presented, l imited psychometric data have been available. The current study estimated t he internal consistency and additional psychometric properties of the test in a sample of 66 persons with acute traumatic brain injury. internal consi stency as measured by alpha was 66. A homogeneous sample and a restricted r ange of scores likely attenuated this estimate. Using the standard cutoff s core, only 32% of the sample showed impaired performance. Visual form discr imination as measured by this test may be affected less by traumatic brain injury than other cognitive processes such as attention and memory.