What is the VASI?


Visual Assessment of Sexual Interest (VASI)

The VASI is an objective physiological evaluation designed to capture and measure specific visual fixation responses associated with sexualized interest. Utilizing sophisticated eye gaze technology, the VASI captures and records visual activity as the individual views neutral and test stimuli. 

Each test stimulus contains images of individuals from both sexes and represents each Tanner Scale of sexual development. 

Specific Visual fixation responses associated with sexualized interest are identified and then combined using an algorithm into a Visual Fixation Response specific to gender and age group based on the Tanner Scale of sexual development.

20 Years of Research


The development of the VASI follows 20 years of research collecting data from several thousand adult sex offenders on patterns of sexual offending including victim selection, visual interest, and visual behavior.

This research also included observing and evaluating offenders’ visual interaction in thousands of assessments involving the presentation of images to the offender.

This research identified specific, unique, and consistent visual behavior patterns. These visual behaviors are strong indicators of their sexual interest and/or the risk to sexually act out. We evaluated what they looked at, how they looked at images etc. in everyday activities, including various media such as television, magazines, books, and computer use. The VASI captures the observations made over the last 20 years in a one hour sexual offender risk assessment evaluation.

Based on Neuroscience

The VASI was developed by Dr. Eric Sellers, a leader in Cognitive Neuroscience and Dr. Mike Adler, renowned for decades in the assessment and treatment of sexual offenders.

Here at HemispheresNeuro we understand that the assessment options available for sex offenders are limited. Utilizing the VASI as part of your overall assessment of risk increases accuracy and confidence resulting in improved effectiveness with treatment plans and intervention.

The VASI is affordable for any size provider. We have several payment and use plans for providers whether you evaluate one, two, or 50 clients per month.

“The VASI has been an invaluable tool in the assessment and treatment of sex offenders.  Having this objective test has helped establish a client’s high risk areas for supervision and targeted needs for treatment. “


Karan E. Goins, LCSW