Millisecond Forums

Allowing response before presentation of last item in a trial

https://forums.millisecond.com/Topic30666.aspx

By MaxPrimbs - 1/29/2021

Dear Community,

we´re programming a reaction time experiment in Inquisite 6. In the experiment, participants will categorise a stimulus as fast as possible. The stimulus is hereby only being presented for a few hundred milliseconds.

The timing of each trial looks somewhat like this:

/ stimulustimes=[0=fixation, reminder_right, reminder_left; 1000=Old_Happy_r; 1500=Blackscreen_pic]

Now, we ran into a problem: You cannot respond before the Blackscreen_pic has been presented and the reaction time measurement seems to start after the presentation of the last item (i.e. Blackscreen_pic). Optimally, we would like the reaction time measurement to begin running when the Old_Happy_r is being presented (and also allow responses starting at that time). Is this possible in Inquisite 6?

Best,

Max
By Dave - 1/29/2021

 
MaxPrimbs - 1/29/2021
Dear Community,

we´re programming a reaction time experiment in Inquisite 6. In the experiment, participants will categorise a stimulus as fast as possible. The stimulus is hereby only being presented for a few hundred milliseconds.

The timing of each trial looks somewhat like this:

/ stimulustimes=[0=fixation, reminder_right, reminder_left; 1000=Old_Happy_r; 1500=Blackscreen_pic]

Now, we ran into a problem: You cannot respond before the Blackscreen_pic has been presented and the reaction time measurement seems to start after the presentation of the last item (i.e. Blackscreen_pic). Optimally, we would like the reaction time measurement to begin running when the Old_Happy_r is being presented (and also allow responses starting at that time). Is this possible in Inquisite 6?

Best,

Max

/beginresponsetime is what you need:

https://www.millisecond.com/support/docs/v6/html/language/attributes/beginresponsetime.htm

Depending on how you want the trial to behave after response -- i.e. continue to show the remaining stimuli or not -- you may also need /responseinterrupt:

https://www.millisecond.com/support/docs/v6/html/language/attributes/responseinterrupt.htm
By MaxPrimbs - 1/29/2021

 
Dave - 1/29/2021
 
MaxPrimbs - 1/29/2021
Dear Community,

we´re programming a reaction time experiment in Inquisite 6. In the experiment, participants will categorise a stimulus as fast as possible. The stimulus is hereby only being presented for a few hundred milliseconds.

The timing of each trial looks somewhat like this:

/ stimulustimes=[0=fixation, reminder_right, reminder_left; 1000=Old_Happy_r; 1500=Blackscreen_pic]

Now, we ran into a problem: You cannot respond before the Blackscreen_pic has been presented and the reaction time measurement seems to start after the presentation of the last item (i.e. Blackscreen_pic). Optimally, we would like the reaction time measurement to begin running when the Old_Happy_r is being presented (and also allow responses starting at that time). Is this possible in Inquisite 6?

Best,

Max

/beginresponsetime is what you need:

https://www.millisecond.com/support/docs/v6/html/language/attributes/beginresponsetime.htm

Depending on how you want the trial to behave after response -- i.e. continue to show the remaining stimuli or not -- you may also need /responseinterrupt:

https://www.millisecond.com/support/docs/v6/html/language/attributes/responseinterrupt.htm

Thanks, that worked!