Millisecond Forums

gaze-sensitive fixation cross

https://forums.millisecond.com/Topic26798.aspx

By doh - 4/12/2019 

Hi everybody,

just another short question from me. I am connecting my experiment to an eyetracker. Therefore i want to create a gaze-sensitive fixation cross.
Everything works fine so far, but i want the validresponse to happeny only when the participants gaze at the cross for 2 seconds.
Can i just use / beginresponsetime=2000 to programm this?


<trial fixation>
/ beginresponsetime=2000
/ stimulustimes = [1=fixation]
/ inputdevice = eyetracker
/ validresponse = (fixation)
/ branch = [trial.presentstimuli;]
</trial
By Dave - 4/14/2019

doh - Saturday, April 13, 2019
Hi everybody,

just another short question from me. I am connecting my experiment to an eyetracker. Therefore i want to create a gaze-sensitive fixation cross.
Everything works fine so far, but i want the validresponse to happeny only when the participants gaze at the cross for 2 seconds.
Can i just use / beginresponsetime=2000 to programm this?


<trial fixation>
/ beginresponsetime=2000
/ stimulustimes = [1=fixation]
/ inputdevice = eyetracker
/ validresponse = (fixation)
/ branch = [trial.presentstimuli;]
</trial

No, /beginresponsetime = 2000 would just mean that the trial waits 2 seconds before it ever starts accepting any responses. /aoidurationthreshold should be what you are looking for, I think:

https://www.millisecond.com/support/docs/v5/html/language/attributes/aoidurationthreshold.htm
By doh - 4/14/2019

Dave - Monday, April 15, 2019
doh - Saturday, April 13, 2019
Hi everybody,

just another short question from me. I am connecting my experiment to an eyetracker. Therefore i want to create a gaze-sensitive fixation cross.
Everything works fine so far, but i want the validresponse to happeny only when the participants gaze at the cross for 2 seconds.
Can i just use / beginresponsetime=2000 to programm this?


<trial fixation>
/ beginresponsetime=2000
/ stimulustimes = [1=fixation]
/ inputdevice = eyetracker
/ validresponse = (fixation)
/ branch = [trial.presentstimuli;]
</trial

No, /beginresponsetime = 2000 would just mean that the trial waits 2 seconds before it ever starts accepting any responses. /aoidurationthreshold should be what you are looking for, I think:

https://www.millisecond.com/support/docs/v5/html/language/attributes/aoidurationthreshold.htm

Thanks again!