Presenting a stimulus based on averaged stimulus reaction time

[Kipras Varkala]

Hello Everyone,

What I am aiming to do is have a stimulus first be presented for 350ms and then the presentation time updated by averaging with the participants reaction time to the stimulus. For example, Trial 1: Average(350ms, 247ms) = New stimulus duration time (298ms), Trial 2: Average(350ms, 247ms, 205ms) = New stimulus duration time (267ms), etc...

//////////////Here is the code that I have written so far//////////////////////////////////////////////////////

User Script:

Dim nRT As Summation

In-Line Code (Block Level):

Set nRT = New Summation

c.SetAttrib "MeanRT", 350

In-Line Code (Trial Level AFTER stimulus presentation):

nRT.AddObservation Stimulus.RT

c.SetAttrib "MeanRT", nRT.Mean

////////////////////////////////////////////////////////////////////////////////////////////////////////////////

The MeanRT attribute is what I have in place for the duration value for the stimulus. I have considered your previous warnings about creating a buffer between the updating function and added buffer stimuli and set the PreRelease to 0, but with no success. With all of my varied attempts I am either getting 0ms or 350ms stimulus duration times and never an average. I suspect I am not updating the attributes properly.

Please let me know if there is any other relevant information I can provide.

Thank you for your time,

Kipras

[David McFarlane]

Kipras,

At the trial level, try moving the line

c.SetAttrib "MeanRT", nRT.Mean

to InLine code BEFORE stimulus presentation instead of after.

Also, try setting Generate PreRun of your stimulus object to
"BeforeObjectRun".

-- David McFarlane

On 2022-08-21 Sun 7:40 PM, Kipras Varkala wrote:
> Hello Everyone,
>
> What I am aiming to do is have a stimulus first be presented for 350ms
> and then the presentation time updated by averaging with the
> participants reaction time to the stimulus. For example, Trial 1:
> Average(350ms, 247ms) = New stimulus duration time (298ms), Trial 2:
> Average(350ms, 247ms, 205ms) = New stimulus duration time (267ms), etc...
>
> //////////////Here is the code that I have written so
> far//////////////////////////////////////////////////////
>

> _User Script:_
> _
> _
> Dim nRT As Summation
>
> _In-Line Code (Block Level):_

>
> Set nRT = New Summation
>
> c.SetAttrib "MeanRT", 350
>

> _In-Line Code (Trial Level AFTER stimulus presentation):_

[Kipras Varkala]

David,

Thank you! It works now :)

Best,

Kipras