Logging a Response to Stimulus During Fixation Cross

[Darla]

Hello Everyone,

I'm wondering if it is possible to log delayed responses to a stimuli that come after a stimuli has been removed and replaced by a fixation cross.

I currently have the stimulus showing for 1500ms followed by a fixation cross for 500ms. It would be ideal if participants could still respond to the stimuli and have it logged during the 500ms fixation. However, when I try to set this up, the fixation cross seems to override it every time and no answers get logged within the 500ms time window. Is what I'm looking to do even possible?

Darla

[David McFarlane]

Darla,

Please see my response to your earlier post.

-- David McFarlane

[Michiel S-Spape]

Hi Darla,

What you’re wanting to look at is the difference between TimeLimit and Duration. The former is normally set to be the same as the duration, but does not have to be. It refers to the maximum time for which a response is still logged as part of an option – as opposed to the duration (the time the object remains “on the screen”).

 

Best,

Michiel

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[Darla]

Hi Michiel,

Thank you for your response. This was my first instinct. I had changed the Time Limit to 2000ms but none of the responses have been logged. I am not sure if the fixation cross overrides it or if there is a separate issue.

Courtney

[Michiel S-Spape]

Hi Courtney,

 

If it looks for similar responses it will perhaps override, I don’t know how your experiment complicates things. What you should try is to remake something similar with the most simple means possible. I show you here in a tiny experiment – my RT was logged at 1701 ms last time I tried. Perhaps after you can get this to work, try to fix the more interesting experiment you’re working on!

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[David McFarlane]

Courtney or Darla,

OK, it seems like you have properly used Extended input, but it fails to
log responses that come during the fixation object that follows your
main stimulus (I assume that it does log responses that come during the
main stimulus).

If you use EP2.0.10.242 or later, I suspect you got bitten by a
combination of
https://support.pstnet.com/hc/en-us/articles/229355227-NEW-FEATURE-PreRelease-defaults-changed-to-promote-better-timing-accuracy-17936-
and
https://support.pstnet.com/hc/en-us/articles/229358047-NEW-FEATURE-Procedure-ProcessPendingInputMasks-19271-
. Follow the instructions there (set Process Pending Input Masks to
"All" -- that should have been the default setting, so I don't know how
it got changed in your program).

If instead you use an earlier version of EP2, then I suspect that your
fixation is the last object in your Procedure and has some PreRelease
value. In that case set its PreRelease to 0 (this also works for
EP2.0.10.242, but then you lose other advantages by doing it that way).

Best,
-- David McFarlane