Millisecond Forums

Hello,

I'm new to using Inquisit and have been going through the tutorials while writing my own code.  I've been puzzled that in both my code and in the tutorials, I am getting negative numbers in the data file under stimulusonset.  I've attached a data file from the CovertAttention tutorial. I'd like to verify the accuracy of the timing of my system. Does the negative mean that the stimulus is appearing prior to when the trial was expected to start?

Thanks for your help in advance!

Best,
Anthony