The TOVA (Test of Variables of Attention) is a computerized neuropsychological test designed to assess attention and inhibitory control, particularly in the context of Attention-Deficit/Hyperactivity Disorder (ADHD). The test involves a visual continuous performance task where individuals are required to respond to specific stimuli while inhibiting responses to non-target stimuli.

Here's a breakdown of how the TOVA typically works:

- Visual Stimuli Presentation: During the test, visual stimuli are presented on a computer screen. These stimuli are typically letters or symbols.

- Target and Non-Target Stimuli: Individuals are instructed to respond to a specific target stimulus (e.g., a specific letter) by pressing a designated key or button. Non-target stimuli require the individual to withhold a response.

- Timing and Variability: The TOVA assesses various aspects of attention, including sustained attention, response time, and variability in responding. It measures how consistently an individual responds over time.

- Objective Data Collection: The TOVA collects objective data on an individual's performance, providing quantitative measures of attention and inhibitory control. The results are typically presented in a report that includes various metrics and indices.

- Analysis and Interpretation: The collected data is analyzed to assess attentional performance and inhibitory control. Clinicians use the results to aid in the diagnosis and monitoring of ADHD.

It's important to note that TOVA is just one tool among many tools used in the assessment of ADHD. Interpretation of results should be done by qualified healthcare professionals familiar with the nuances of neuropsychological testing and ADHD diagnosis.