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ImPACT Version 4: What Changed, What It Means, and How It Affects Your Baseline
The world's most widely used computerized neurocognitive concussion test, explained.
ImPACT (Immediate Post-Concussion Assessment and Cognitive Testing) is the most widely used computerized neurocognitive test in concussion management worldwide, with over 60 million tests administered and more than 1,000 published research studies, according to ImPACT Applications, Inc. (a Riverside Insights company). Originally developed at the University of Pittsburgh Medical Center in the late 1990s, it has evolved through multiple iterations, with Version 4 representing the current release.
What ImPACT measures
ImPACT measures four composite domains through six test modules: Word Memory (verbal learning and recognition), Design Memory (visual-spatial memory), X’s and O’s (visual working memory and processing speed), Symbol Match (visual processing speed and learning), Color Match (impulse control and response inhibition), and Three Letters (working memory). These produce composite scores for verbal memory, visual memory, visual motor speed, and reaction time.
Research on ImPACT’s psychometric properties — including test-retest reliability studies published by Iverson et al. (2003) and Elbin et al. (2011) — has demonstrated one-week test-retest reliability ranging from ICC 0.67–0.86 across composite scores, with longer intervals showing some degradation.
The ImPACT product family
It’s important to understand the ImPACT product family, as confusion is common. ImPACT (clinical version) is the full post-injury assessment tool, administered by healthcare providers for concussion management. ImPACT Baseline is the at-home, online pre-injury baseline test available at BaselineTesting.com for $15–$20. ImPACT Quick Test is a sideline assessment tool combining the BESS protocol with a rapid cognitive check, designed for immediate post-injury screening. ImPACT Pediatric is an iPad-based version adapted for children ages 5–9. All are FDA-cleared medical devices.
How we use ImPACT at Headquarters
At Headquarters, we use ImPACT as one component of our multi-domain baseline battery. It provides excellent cognitive assessment data with strong validity indicators. But we pair it with balance testing, VOMS, and symptom evaluation because — as the research consistently demonstrates — cognition alone captures only one dimension of brain function. See our guide on how to read an ImPACT report for more on score interpretation.