Subject: Does testing people's reaction time, are people trained to respond faster?

We did a science fair project last year to determine if boys or
girls had quicker reation times (boys did).  We used a light as
a stimulus and an electronic timer to measure their response.

We discovered that people were faster with their left hands
(221 milliseconds) than with their right hands (228 ms).  This 
seemed odd since more people are right handed.  

When people took the test, is it possible they picked up the
test button with their right hand (as they would be used to) and
got practice taking the test.  When they changed to their left
hand, would they be more prepared for the test and respond 
faster?

How could we test this?  This seems like it would make a good
follow-up project to last year's project.

Thanks you for any help and ideas.

Karinza Akin
aakin@erinet.com

Re: Does testing people's reaction time, are people trained to respond faster?