What is the VASI?

The Visual Assessment of Sexual Interest (VASI) is an objective physiological evaluation designed to capture and measure visual behavior associated with sexualized interest. The VASI uses eye-gaze technology to record visual behavior as an individual views neutral and test stimuli. Test stimuli contain images of individuals from both sexes and each level of sexual maturity, as defined by the Tanner Stages of Sexual Maturation. The recorded visual behavior is algorithmically combined into Units of Visual Fixation specific to each sex and each Tanner Stage. The results of the assessment are used to assess risk and optimize treatment plans.

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Benefits of using the VASI

  • The VASI uses eye-tracking technology to objectively measure gaze behavior related to sexual interest.
  • Minimal System Requirements
  • Typical assessment time less than 15 minutes
  • Test administrator does not need specific certification and does not have access to results
  • Results are sent directly to clinician
  • Interpretation of results are verified by a licensed Ph.D.
  • Internet connection is not required at time of testing, perfect for jail assessment
  • Only non-offensive images are presented
  • Client literacy is not required
  • Only eye movement is required; thus, physical impaired clients can be tested
  • Recognized by TSOTB fee waiver
  • Admissible in TN court
  • On site testing can be performed by a HemispheresNeuro technician if requested

Meet Our Development Team

Michael Adler, Ph.D.

  • Assessed, treated, consulted on over 7,000 sex offenders
  • Conducted more than 4,000 plethysmograph assessments
  • Testified hundreds of times in state and Federal court
  • Presented at numerous state, regional, and national conferences

Eric Sellers, Ph.D.

  • Professor of cognitive neuroscience
  • Extensive experience developing brain-computer interface technology
  • More than 60 peer-reviewed publication
  • Strong track record of funding from the National Institutes of Health and other sponsors