Millisecond Forums » Millisecond Forums » Inquisit 4 » simultaneous button press

simultaneous button press

sjstran12 — Fri, 07 Nov 2014 11:51:06 GMT

Hey,

I am trying to make it so two buttons will need to be pressed for the nextkey. How can I do this?

Thanks

RE: simultaneous button press

Dave — Fri, 07 Nov 2014 11:51:06 GMT

Great!

RE: simultaneous button press

sjstran12 — Fri, 07 Nov 2014 11:33:54 GMT

ohhh I get what is going on now. Thank you so much for your help

RE: simultaneous button press

Dave — Fri, 07 Nov 2014 10:14:21 GMT

<trial late>
/isvalidresponse = [(50)]
</trial>

is invalid syntax (same issue as outlined previously).

< trial era >
/stimulusframes = [1=era, erastim]
/timeout = 15000
/ isvalidresponse = [trial.late.response == 44 && trial.late.latency < 2000]
/responsetrial = (" ", method)
</trial>

nowhere do you actually run <trial late>. Thus you cannot expect the above /isvalidresponse to do anything.

<trial first>
/ stimulusframes = [1=mytext]
/ validresponse = (44)
/ branch = [trial.second]
</trial>

<trial second>
/ validresponse = (50)
/ iscorrectresponse = [trial.second.latency < 2000]
</trial>

<block myblock>
/ trials = [1=first]
</block>

<text mytext>
/ items = ("Press Z and then M within 2 seconds.")
/ erase = false
</text>

RE: simultaneous button press

sjstran12 — Fri, 07 Nov 2014 10:00:02 GMT

no more error messages but pressing the buttons at the same time does nothing.

<trial late>
/isvalidresponse = [(50)]
</trial>

< trial era >
/stimulusframes = [1=era, erastim]
/timeout = 15000
/ isvalidresponse = [trial.late.response == 44 && trial.late.latency < 2000]
/responsetrial = (" ", method)
</trial>

< trial method >
/stimulusframes = [1=iorm, iorm2]
/timeout = 15000
/ validresponse = ("z" "m")
/branch = [(openended.open)]
</trial>

RE: simultaneous button press

Dave — Fri, 07 Nov 2014 05:11:49 GMT

#1: You need to use */isvalidresponse*, not */validresponse*
#2: Your syntax is still wrong. It ought to be:

/ isvalidresponse = [trial.late.response == 44 && trial.late.latency < 2000)]

RE: simultaneous button press

sjstran12 — Thu, 06 Nov 2014 20:12:41 GMT

I got an error that says invalid text

<trial late>
/ validresponse = (50)
/timeout = 15000
</trial>

< trial era >
/stimulusframes = [1=era, erastim]
/timeout = 3500
/validresponse = [trial.late.response == (44) && trial.late.latency < 2000)]
/responsetrial = ("m", method)
</trial>

RE: simultaneous button press

Dave — Tue, 04 Nov 2014 10:26:34 GMT

Your syntax in the /iscorrectresponse attribute is incorrect. It ought to be

/ iscorrectresponse = [trial.late.response == *ENTER THE NUMERICAL KEYBOARD SCANCODE FOR M HERE* && trial.late.latency < 2000]

For the appropriate scancode to enter above, see the "Keyboard Scan Codes" topic in the documentation as well as Tools -> Keyboard Scancodes...

RE: simultaneous button press

sjstran12 — Tue, 04 Nov 2014 10:00:30 GMT

Is this what you mean? I want it so the valid response is this [("m") && trial.late.latency < 2000] but it wont allow me to put that in the validresponse

<trial late>
/ validresponse = ("z")
/timeout = 15000
</trial>

< trial era >
/stimulusframes = [1=era, erastim]
/timeout = 3500
/validresponse = ("m")
/ iscorrectresponse = [("m") && trial.late.latency < 2000]
/responsetrial = ("m", method)
</trial>

RE: simultaneous button press

Dave — Sat, 01 Nov 2014 18:06:37 GMT

Yes, but as with your initial request above, you need two <trial> elements to do that. You can do the response evaluation via /iscorrectresponse a la

/ iscorrectresponse = [... && trial.2ndtrial.latency < 2000]

RE: simultaneous button press

sjstran12 — Sat, 01 Nov 2014 14:47:41 GMT

Is it possible to have the participant press one button and be required to press another button within x number of milliseconds in order to give the correct response?

RE: simultaneous button press

sjstran12 — Fri, 31 Oct 2014 11:42:13 GMT

Thank you. I guess I'll have to make due with the one

RE: simultaneous button press

Dave — Fri, 31 Oct 2014 10:55:45 GMT

In Inquisit, a <trial> registers a *single* response. Thus, it is not possible to do this. The next-best thing you can do is run two trials in sequence -- one to register the 1st button press, another one to register the 2nd.