What a Continuous Performance Test actually measures
The attention test at the core of a Vextara assessment isn’t a quiz. Here’s what it records, why it’s a little boring on purpose, and what the numbers mean.
The Vextara clinical team· August 5, 2026
A Continuous Performance Test (CPT) is a standardized, computer-based task that’s been used in attention research and clinical evaluation for decades. You respond to certain targets and withhold on others, over several minutes. Simple — deliberately so.
Why it’s intentionally dull
Attention difficulties don’t show up when something is novel and exciting; they show up when a task is repetitive and low-stimulation and you have to keep going anyway. A CPT recreates exactly that condition, then measures how performance holds — or slips.
What it records
- Attention — missed targets and lapses across the task (how steadily focus is held).
- Impulse control — responses to signals you were supposed to withhold (acting before checking).
- Reaction time and consistency — not just speed, but how variable your responses are.
That last one matters more than people expect. Reaction-time variability — the wobble in how fast you respond from moment to moment — is one of the most robust, well-studied signals of attentional instability.
Norm-referenced, not absolute
A raw score means little by itself. Yours is compared against what’s typical for your age, so a result like “more difficulty than expected” is relative to the right peer group — not an arbitrary cutoff.
Objective ≠ diagnostic. A CPT is decision support — one input a licensed clinician weighs alongside your intake and history. It doesn’t diagnose on its own, and no single number rules ADHD in or out.
Why pair it with a DSM-5 intake
Performance data tells you how attention behaves; the DSM-5 intake captures the rest of what a diagnosis requires — symptom domains, onset, multiple settings, and real-world impairment. Together they give a clinician a structured, evidence-based picture instead of a gut feeling.
This article is educational and not a diagnosis or medical advice. A licensed clinician provides any diagnosis and care. If you’re in crisis, call or text 988, or call 911.
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