Negative Stimulus Onset Times


Negative Stimulus Onset Times

Author
Message
asali
asali
New Member
New Member (12 reputation)New Member (12 reputation)New Member (12 reputation)New Member (12 reputation)New Member (12 reputation)New Member (12 reputation)New Member (12 reputation)New Member (12 reputation)New Member (12 reputation)

Group: Forum Members
Posts: 1, Visits: 10
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
Attachments
CovertAttention.dat (9 views, 35.00 KB)
Dave
Dave
Supreme Being
Supreme Being (678K reputation)Supreme Being (678K reputation)Supreme Being (678K reputation)Supreme Being (678K reputation)Supreme Being (678K reputation)Supreme Being (678K reputation)Supreme Being (678K reputation)Supreme Being (678K reputation)Supreme Being (678K reputation)

Group: Administrators
Posts: 9.8K, Visits: 46K
asali - 8/7/2019
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

A negative onset would usually indicate some issue with respect to syncing to the system's graphics card / display refresh rate. The timings in the file appear internally consistent, but there may be some off-by-one frame issue. Try updating your graphics card driver and make sure there is no other application running in the background that might interfere with the display system while Inquisit is running.

GO


Reading This Topic


Login
Existing Account
Email Address:


Password:


Social Logins

Select a Forum....






Millisecond Forums


Search