Using a joystick as a response and defining correct response.

[terhi helminen]

Hi,

I have recently made a task where participant has to answer with joystick
(pulling it backward or forward).  The Inline code below helped me to make
an appropriate code, perhaps it helps you too...

(from
https://groups.google.com/forum/?fromgroups=#!searchin/e-prime/joystick$20as$20response$20device/e-prime/ww6C02LZ8nY/qDT5rsZrerkJ
 )

----

Dim nInitY As Integer
Dim nCurrentY As Integer
Dim nDiff As Integer

nInitY = Joystick.CursorY

Do
   nCurrentY = Joystick.CursorY
   nDiff = nInitY - nCurrentY

Loop Until Abs(nDiff) > 50

Stimulus.RTTime = Clock.Read
Stimulus.RT = Stimulus.RTTime - Stimulus.OnsetTime

If nDiff > 0 Then
   Stimulus.RESP = "Up"
Else
   Stimulus.RESP = "Down"
End If
----
As I also wanted to give a feedback based on subjects answer, I used
contingent branching based on the response. (See the example in
http://www.pstnet.com/support/samples.asp?Mode=View&SampleID=3 )

Hope this helps!
- Terhi


On Thu, Nov 1, 2012 at 3:47 PM, Diana Laura Rosa Leyra <
dl.rosaleyra at gmail.com> wrote:

> Thanks Pip. I'll try this!
>
>
> On Wed, Oct 31, 2012 at 7:46 PM, Pip <pipgriffiths86 at gmail.com> wrote:
>
>> I'm not sure that you can do this automatically, but if you code some
>> inline to store the final x co ord of the cursor then you can look at this
>> in the output file and use filters to determine whether the correct answer
>> was given. You can also set up a screen that will respond if the answer was
>> "correct" through using this method.
>>
>> Essentially you set a variable, get EPRime to write the x co ord to that
>> variable and then get a conditional statement to read that file and
>> feedback the necessary response to the participant
>>
>> Hope this helped
>>
>> Pip
>>
>> Sent from my iPhone
>>
>> On 31 Oct 2012, at 21:00, Diana Laura Rosa Leyra <dl.rosaleyra at gmail.com>
>> wrote:
>>
>> All,
>>
>> We would like to use a joystick as a response device. Our task requires
>> participants to judge whether the hand they see on the screen is a right or
>> left hand. We'd like for them to respond with the joystick. Basically, I am
>> trying to define a correct answer in terms of the position of the joystick
>> at the time of response. Anyone have any ideas on how this would work and
>> if it would work at all?
>>
>> I am working with EPrime 2.0 Professional and know that I have to use a
>> bit of code, but am unsure as to where or how to use it.
>>
>> Thank you,
>> Diana
>>
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>
>
>
> --
> -------------------------------
> Diana Laura Rosa-Leyra
> dl.rosaleyra at gmail.com
>
>
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