jnd: just noticeable difference

In the field of psychophysics, that branch of experimental psychology that studies sensation and perception, a jnd is the amount that something must be changed for the difference to be noticeable, defined to mean that the change is detectable half the time. My goal is to make a noticeable difference -- many jnds worth -- in human-centered technology.

I started my career as an experimental/mathematical psychologist in psychophysics, and my love of the exquisite sensitivity and dynamic range of hearing and seeing, as well as the power of human perception has stayed with me.

For the definition of jnd as used in psychophysics, see the Wikipedia definition.


Updated January 11, 2020

I am declining travel requests not directly related to the University of California, San Diego Design Lab. (Not all trips are listed.)

February 21, 2020. At Northwestern (Segal Design Institute)

March 8-11, 2020. Human Factors and Ergonomics Conference on Healthcare (Toronto, Ontario, Canada)

Closing Keynote (with Joe Cafazzo, Director of Healthcare Human Factors group, in the University Health Network of the University of Toronto). https://hcsd2020.org/

March 13, 2020. Nielsen Norman group Online Seminar (11 AM, California time)

Don Norman Answers: Your Top UX Questions.

The topics will depend on questions submitted by attendees based on how frequently they were asked and if they are thought-provoking, interesting, practical, and applicable for a broad audience.
(This event isn't yet on the website. Keep checking.)

March 18, 2020. At IBM Design, Austin TX

March 20, 2020. "Old people are cool, design for them sucks." South by Southwest. (SXSW: Austin, TX)

Ayse Birsel, John Zapolski, and me: A panel. See https://schedule.sxsw.com/2020/events/PP1131049