The National Eye Institute of the National Institutes of Health has awarded Global Tactile NIH/NEI SBIR Grant R43 EY032008 for "Development of a haptic guidance interface for eliminating veering during indoor and outdoor navigation by blind and visually impaired travelers". See our Projects page for more information.


I want to personally thank you for your interest in our company, projects, and upcoming products and services.

Our laboratory develops noninvasive neuroengineered user-interface technologies designed to alleviate social, accessibility, and mobility restrictions for disadvantaged populations — with a particular emphasis on addressing problems stemming from Blindness and Visual Impairment.

I look forward to hearing from you.


Christopher S. Kallie, Ph.D.
Founder and President


Education & Training

University of Minnesota—Twin Cities, Minneapolis
  B.A. Cognitive Psychology

University of Minnesota—Twin Cities, Minneapolis
  Ph.D. Cognitive & Biological Psychology
  Minor Mathematical Modeling & Statistics

The Ohio State University, Columbus
  Postdoctoral Research
  Cognitive & Computational Neuroscience

Positions and Honors

Current Position
  Founder and President of Global Tactile, LLC. Research and product development for accessibility, including adaptive technologies for blind and disabled users.

Previous Positions and Employment

2014-2016 Faculty Lecturer, The Ohio State University
  Psychology 3513 — Cognitive Neuroscience
  Psychology 3310 — Sensation and Perception

2013-2015 Postdoctoral Researcher, The Ohio State University

2011 Graduate Lecturer, University of Minnesota
  Psychology 3902W — Major Project (Spring & Summer)

2008-2010 Scientific Apparatus Lab Manager, University of Minnesota

2007-2012 Graduate RA — Computational Perception and Action Lab, UMN

2006-2008 Instructional Technology Fellow, University of Minnesota

2006-2012 Graduate RA — Minnesota Lab for Low-Vision Research, UMN

2004-2006 Research Assistant — Minnesota Lab for Low-Vision Research, UMN

2000-2004 Undergrad RA — Minnesota Lab for Low-Vision Research, UMN

1999-2000 Undergrad RA — Pick Lab, Institute of Child Development, UMN

Contributions to Science

1. Low Vision, Blind Navigation, and Spatial Perception: These contributions addressed problems associated with low vision and blindness. Of particular interest was my manuscript titled: Variability in Stepping Direction Explains the Veering Behavior of Blind Walkers, which seeded our working solution for veering.

a. Bochsler, T. M., Legge, G. E., Gage, R., & Kallie, C. S. (2013). Recognition of Ramps and Steps by People with Low Vision. Investigative Ophthalmology & Visual Science, 54(1), 288–294.

b. Kallie, C. S., Legge, G. E., & Yu, D. (2012). Identification and Detection of Simple 3D Objects with Severely Blurred Vision. Investigative Ophthalmology & Visual Science, 53(13), 7997–8005. doi:10.1167/iovs.12-10013

c. Bochsler, T. M., Legge, G. E., Kallie, C. S., & Gage, R. (2012). Seeing Steps and Ramps with Simulated Low Acuity: Impact of Texture and Locomotion. Optometry and Vision Science: Official Publication of the American Academy of Optometry, 89(9), E1299–1307.

d. Legge, G. E., Yu, D., Kallie, C. S., Bochsler, T. M., & Gage, R. (2010). Visual Accessibility of Ramps and Steps. Journal of Vision, 10(11), 8.

e. Kallie, C. S., Schrater, P. R., & Legge, G. E. (2007). Variability in Stepping Direction Explains the Veering Behavior of Blind Walkers. Journal of Experimental Psychology. Human Perception and Performance, 33(1), 183–200.

f. Mason, S. J., Legge, G. E., & Kallie, C. S. (2005). Variability in the Length and Frequency of Steps of Sighted and Visually Impaired Walkers. Journal of Visual Impairment & Blindness, 99(12), 741–754.

2. Low Vision and Reading: These contributions involved scientific software development and high-level mathematical modeling and statistical methods, culminating in two commercialized products available in Brazil and the United States: MNREAD-Portuguese and MNREAD-Spanish.

a. He, Y., Scholz, J. M., Gage, R., Kallie, C. S., Liu, T., & Legge, G. E. (2015). Comparing the Visual Spans for Faces and Letters. Journal of Vision, 15(8), 7-7.

b. Cheung, S.-H., Kallie, C. S., Legge, G. E., & Cheong, A. M. Y. (2008). Nonlinear Mixed-Effects Modeling of MNREAD Data. Investigative Ophthalmology & Visual Science, 49(2), 828–835. doi:10.1167/iovs.07-0555

c. Castro, C. T. M. de, Kallie, C. S., & Salomão, S. R. (2005). Development and Validation of the MNREAD Reading Acuity Chart in Portuguese. Arquivos Brasileiros de Oftalmologia, 68(6), 777–783.

3. Computational Neuroscience: These contributions implemented advanced computational modeling techniques.

a. Todd, J. T., Egan, E. J., & Kallie, C. S. (2015). The Darker-Is-Deeper Heuristic for the Perception of 3D Shape from Shading: Is it Perceptually or Ecologically Valid? Journal of Vision, 15(15), 2-2.

b. Todd, J. T., Weismantel, E., & Kallie, C. S. (2014). On the Relative Detectability of Configural Properties. Journal of Vision, 14(1), 18.

4. Other Statistical Modeling and Academic Papers:

a. Shryack, J., Steger, M. F., Krueger, R. F., & Kallie, C. S. (2010). The Structure of Virtue: An Empirical Investigation of the Dimensionality of the Virtues in Action Inventory of Strengths. Personality and Individual Differences, 48(6), 714–719.

b. Dissertation: Evaluating Object Visibility with Simulated Visual Impairment Using Real and Rendered Scenes —

c. Specials Thesis: Obstacle Detection and Avoidance as a Partially-Observable Markov-Decision Process

Additional Information: Research Support and/or Scholastic Performance

Completed Research Support

NSF BCS-0962119 Jim Todd (PI) 2013-2015
  The Perceptual Identification and Representation of Image Contours
  Role: Postdoctoral Researcher

  • Created and Tested Computational Models of Visual Perception
  • Implemented Supercomputer Cluster to Analyze Large Image Tensors
  • Performed Multilinear PCA and Compared Classifiers to Human Performance

NIH R01 EY017835-01 Gordon Legge (PI) 2007-2012
  Designing Visually Accessible Spaces
  Role: Graduate Research Assistant

  • Created and Tested Computational Models of Simulated Visual Impairment
  • Designed Methods for Comparing Visibility in Real and Rendered Scenes

NIH R43 & R44 EY015616 Gordon Legge (PI) & Paul Schrater (PI) 2005-2007
  Indoor Magnetic Wayfinding for the Visually Impaired
  Role: Graduate Research Assistant

  • Developed Procedures for Collecting and Mapping Geomagnetic Isocontours
  • Built Devices for Measuring and Mapping Geospatial Magnetic Perturbations

NIH/NEI R01 EY002934 Gordon Legge (PI) 2002-2005
  Psychophysics of Reading-Normal and Low Vision
  Roles: Undergraduate and Graduate Research Assistant

  • Codeveloped Clinical Vision Tests in Portuguese, Spanish, and Hindi
  • Developed Statistical Tools for Analyzing Clinical Visual Acuity Tests

NIH EY02857 Gordon Legge (PI) 2000-2005
  Object Recognition and Navigation in Normal and Low Vision
  Roles: Undergraduate and Graduate Research Assistant

  • Measured and Modeled Walking Behavior of Blind Pedestrians
  • Explained Veering Tendency of Blind Pedestrians through Psychophysics and Statistical Modeling

Invited Scientific Peer Review

Scientific Journal Reviewer (2014-2015)
  Optometry and Vision Science

Professional Memberships

Vision Sciences Society (2002-2016)
The Association for Research in Vision and Ophthalmology (2003-2008)
Center for Cognitive Sciences University of Minnesota (2003-2012)

Honors and Awards

Inventor Recognition Award — License Signed Issued by the Office for Technology Commercialization, University of Minnesota, for MNREAD-Portuguese Reading-Acuity Chart. Tamaki, C., Kallie, C.S., Mansfield, J.S. and Legge, G.E. (2005)

Undergraduate Research Opportunity Program Award University of Minnesota (2001)

Intellectual Property

Methods, Devices, and Uses of Control and Communication Through Physical Forces
  Patent Pending 10/25/2017

Rapid, Efficient, and Ergonomic Control and Communication Through Touch
  Patent Pending 8/15/2019

MNREAD-Spanish Reading-Acuity Chart
  Copyright 2012

MNREAD-Portuguese Reading-Acuity Chart
  Copyright 2004