# PsychHID problem?

**URL:** <https://psychtoolbox.discourse.group/t/psychhid-problem/952>\
**Category:** Uncategorized\
**Created:** [April 22, 2009, 9:16pm UTC](https://psychtoolbox.discourse.group/t/psychhid-problem/952 "2009-04-22T21:16:45Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Allen\_Ingling](https://avatars.discourse-cdn.com/v4/letter/a/a183cd/32.png) [@Allen\_Ingling](https://psychtoolbox.discourse.group/u/Allen_Ingling)\
**Post date:** [April 22, 2009, 9:16pm UTC](https://psychtoolbox.discourse.group/t/psychhid-problem/952/1 "2009-04-22T21:16:45Z")

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I'm trying to use a trigger/button box device on our MRI scanner with my Macbook Pro Intel with the latest PTB. PsychHID recognizes the device as a keyboard, and when I press the keys or the trigger goes off, key presses correctly show up in the Matlab command window, but PsychHID does not recognize them. I just want to do KbWait(-1), but the events never trigger the KbWait. I try KbWait(1), which is the device number for the trigger, but that doesn't work either.  
  
Any hints?  
  
keith