capturing user reaction times in msecs

• Subject: capturing user reaction times in msecs
• From: julia Cline <email@hidden>
• Date: Tue, 19 Dec 2006 07:47:45 -0800
• Delivered-to: email@hidden
• Delivered-to: email@hidden

I need a simple way to capture reactions times associated with an onscreen event.  The user sees a display, responds via click (or verbally).  I need to get the time the event displays , along with the time that the user responds via mouse click (or verbally). I need the times in msecs so that I can calculate the user's reaction time.

I could use some suggestions about how to do that.  The only documentation that I have mentions NSCalendarDate which doesn't seem like the correct path to me.

Julie Cline

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