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VAS: Visual Analogue Scale

jo700 — Mon, 06 Feb 2017 07:16:11 GMT

Hey everybody,

recently I have tried to implement a VAS into my script. The basic-script I have adopted from a post in millisecond some weeks ago - though I can't find it anymore. That is why I pose my question here.
The problem is, that the post I am referring to, just used 1 VAS. My intention is to implement several VAS (some concerning uncertainty, some attraction etc.). When I do this, the first VAS works perfectly well. If a subject clicks on the VAS-line from 0-100%, a percentage-score appears. The second VAS does not work properly, because if a subject clicks on the VAS-line from 0-100%, the percentage-score of the previous VAS-response appears (instead of the correct percentage-score of the actual VAS-response).

I have the impression that the problem lies somewhere around the "expressions"-element, but I really don't know how to handle that problem. That is why I hope that someone of you has a solution to that problem - that would be really much help!

The following example of 2 VAS should point out my problem:

<block block1A>
/ trials = [1=uncertainty1_trial; 2=question3]
</block>

**************************************************************************************
uncertainty
**************************************************************************************

<trial uncertainty1_trial>
/ stimulusframes = [1=blank, uncertainty1, line1, leftanchor, rightanchor]
/ inputdevice = mouse
/ validresponse = (line1)
/ branch = [trial.showresponse_uncertainty]
</trial>

<trial showresponse_uncertainty>
/ stimulusframes = [1=Y, responsevalue1]
/ inputdevice = mouse
/ validresponse = (noresponse)
/ timeout = 1500
/ recorddata = false
</trial>

<text uncertainty>
/ items = ("To which extent do you agree with the following items:")
/ position = (50, 25)
/ select = sequence
/ erase = false
</text>

<text uncertainty1>
/ items = ("I have the impression that I could not really see the face.")
/ position = (50, 25)
/ select = sequence
/ erase = false
</text>

***********************************************************************************
question 3: degree of change
***********************************************************************************

<trial question3>
/ stimulusframes = [1=question3, line2, leftanchor, rightanchor]
/ inputdevice = mouse
/ validresponse = (line2)
/ branch = [trial.showresponse_question3]
</trial>

<trial showresponse_question3>
/ stimulusframes = [1=X, responsevalue2]
/ inputdevice = mouse
/ validresponse = (noresponse)
/ timeout = 1500
/ recorddata = false
</trial>

<text question3>
/ items = ("Do you think the region has changed?

Please answer that question by clicking on the black line.")
/ position = (50, 25)
/ select = sequence
/ erase = false
</text>

***********************************************************************************
VAS
***********************************************************************************

*** Scale Items ***

<shape line1>
/ shape = rectangle
/ color = (0, 0, 0)
/ size = (700, 6)
/ position = (50, 75)
/ erase = false
</shape>

<shape line2>
/ shape = rectangle
/ color = (0, 0, 0)
/ size = (700, 6)
/ position = (50, 75)
/ erase = false
</shape>

<shape leftborder>
/ shape = rectangle
/ color = (0, 0, 0)
/ size = (6, 30)
/ position = (16, 75)
/ erase = false
</shape>

<shape rightborder>
/ shape = rectangle
/ color = (0, 0, 0)
/ size = (6, 30)
/ position = (84, 75)
/ erase = false
</shape>

<text leftanchor>
/ items = ("I completely disagree")
/ position = (10, 75)
/ size = (50, 50)
/ erase = true(255, 255, 255)
</text>

<text rightanchor>
/ items = ("I completely agree")
/ position = (90, 75)
/ size = (50, 50)
/ erase = true(255, 255, 255)
</text>

*** Response Indicator ***

<text X>
/ fontstyle = ("Arial", -35, true, false, false, false, 5, 0)
/ items = ("o")
/ txcolor = (255, 0, 0)
/ txbgcolor = (transparent)
/ hposition = (trial.question3.responsex / display.width) * 100
/ vposition = shape.line2.vposition
</text>

<text Y>
/ fontstyle = ("Arial", -35, true, false, false, false, 5, 0)
/ items = ("o")
/ txcolor = (255, 0, 0)
/ txbgcolor = (transparent)
/ hposition = (trial.uncertainty1_trial.responsex / display.width) * 100
/ vposition = shape.line1.vposition
</text>

*** Response Scoring Routines ***

<expressions A>
/ correctionvalue = (display.width - shape.line1.width) / 2
/ correctedscore = (trial.uncertainty1_trial.responsex - expressions.correctionvalue) / shape.line1.width * 100
/ roundedvalue1 = format("%.2f", expressions.correctedscore)
</expressions>

<expressions B>
/ correctionvalue = (display.width - shape.line2.width) / 2
/ correctedscore = (trial.question3.responsex - expressions.correctionvalue) / shape.line2.width * 100
/ roundedvalue2 = format("%.2f", expressions.correctedscore)
</expressions>

<text responsevalue1>
/ items = ("<% expressions.roundedvalue1 %> %")
/ position = (50, 85)
</text>

<text responsevalue2>
/ items = ("<% expressions.roundedvalue2 %> %")
/ position = (50, 85)
</text>

<shape blank>
/ shape = rectangle
/ color = white
/ size = (100%, 100%)
/ erase = false
</shape>

RE: VAS: Visual Analogue Scale

jo700 — Mon, 06 Feb 2017 07:16:11 GMT

[quote]

[b]Dave - Monday, January 30, 2017[/b]

[quote]

[b]jo700 - Sunday, January 29, 2017[/b]

[quote]

[b]Dave - Saturday, January 28, 2017[/b]

[quote]

[b]jo700 - Saturday, January 28, 2017[/b]

[/quote]

You need to give your respective expressions different, unique names:

<block block1A>
/ trials = [1=uncertainty1_trial; 2=question3]
</block>

**************************************************************************************
uncertainty
**************************************************************************************

<trial uncertainty1_trial>
/ stimulusframes = [1=blank, uncertainty1, line1, leftanchor, rightanchor]
/ inputdevice = mouse
/ validresponse = (line1)
/ branch = [trial.showresponse_uncertainty]
</trial>

<trial showresponse_uncertainty>
/ stimulusframes = [1=Y, responsevalue1]
/ inputdevice = mouse
/ validresponse = (noresponse)
/ timeout = 1500
/ recorddata = false
</trial>

<text uncertainty>
/ items = ("To which extent do you agree with the following items:")
/ position = (50, 25)
/ select = sequence
/ erase = false
</text>

<text uncertainty1>
/ items = ("I have the impression that I could not really see the face.")
/ position = (50, 25)
/ select = sequence
/ erase = false
</text>

***********************************************************************************
question 3: degree of change
***********************************************************************************

<trial question3>
/ stimulusframes = [1=question3, line2, leftanchor, rightanchor]
/ inputdevice = mouse
/ validresponse = (line2)
/ branch = [trial.showresponse_question3]
</trial>

<trial showresponse_question3>
/ stimulusframes = [1=X, responsevalue2]
/ inputdevice = mouse
/ validresponse = (noresponse)
/ timeout = 1500
/ recorddata = false
</trial>

<text question3>
/ items = ("Do you think the region has changed?

Please answer that question by clicking on the black line.")
/ position = (50, 25)
/ select = sequence
/ erase = false
</text>

***********************************************************************************
VAS
***********************************************************************************

*** Scale Items ***

<shape line1>
/ shape = rectangle
/ color = (0, 0, 0)
/ size = (700, 6)
/ position = (50, 75)
/ erase = false
</shape>

<shape line2>
/ shape = rectangle
/ color = (0, 0, 0)
/ size = (700, 6)
/ position = (50, 75)
/ erase = false
</shape>

<shape leftborder>
/ shape = rectangle
/ color = (0, 0, 0)
/ size = (6, 30)
/ position = (16, 75)
/ erase = false
</shape>

<shape rightborder>
/ shape = rectangle
/ color = (0, 0, 0)
/ size = (6, 30)
/ position = (84, 75)
/ erase = false
</shape>

<text leftanchor>
/ items = ("I completely disagree")
/ position = (10, 75)
/ size = (50, 50)
/ erase = true(255, 255, 255)
</text>

<text rightanchor>
/ items = ("I completely agree")
/ position = (90, 75)
/ size = (50, 50)
/ erase = true(255, 255, 255)
</text>

*** Response Indicator ***

<text X>
/ fontstyle = ("Arial", -35, true, false, false, false, 5, 0)
/ items = ("o")
/ txcolor = (255, 0, 0)
/ txbgcolor = (transparent)
/ hposition = (trial.question3.responsex / display.width) * 100
/ vposition = shape.line2.vposition
</text>

<text Y>
/ fontstyle = ("Arial", -35, true, false, false, false, 5, 0)
/ items = ("o")
/ txcolor = (255, 0, 0)
/ txbgcolor = (transparent)
/ hposition = (trial.uncertainty1_trial.responsex / display.width) * 100
/ vposition = shape.line1.vposition
</text>

*** Response Scoring Routines ***

<expressions A>
/ correctionvalue_a = (display.width - shape.line1.width) / 2
/ correctedscore_a = (trial.uncertainty1_trial.responsex - expressions.correctionvalue_a) / shape.line1.width * 100
/ roundedvalue1 = format("%.2f", expressions.correctedscore_a)
</expressions>

<expressions B>
/ correctionvalue_b = (display.width - shape.line2.width) / 2
/ correctedscore_b = (trial.question3.responsex - expressions.correctionvalue_b) / shape.line2.width * 100
/ roundedvalue2 = format("%.2f", expressions.correctedscore_b)
</expressions>

<text responsevalue1>
/ items = ("<% expressions.roundedvalue1 %> %")
/ position = (50, 85)
</text>

<text responsevalue2>
/ items = ("<% expressions.roundedvalue2 %> %")
/ position = (50, 85)
</text>

<shape blank>
/ shape = rectangle
/ color = white
/ size = (100%, 100%)
/ erase = false
</shape>

[/quote]

Wow, thanks for your quick reply. That worked!

Unfortunately the results of the different VAS-items (inpercent) do not appear in the final data sheet (results mask). That is why Iwould like to take the <data>-element. Is that advisable? If so, do youknow, what I have to write to get the VAS-percentage-information into theresults mask?

Thanks a lot!

[/quote]

You need to specify a <data> and/or <summarydata> element and then log the respective expressions to the data files by including them in the /columns attributes:

<data>
/ columns = (date time subject group blocknum blockcode trialnum trialcode response latency ... expressions.roundedvalue1 expressions.roundedvalue2 ...)
...
</data>

[/quote]

Thanks a lot! That worked perfectly well! :-)

RE: VAS: Visual Analogue Scale

Dave — Mon, 30 Jan 2017 03:27:17 GMT

[quote]

[b]jo700 - Sunday, January 29, 2017[/b]

[quote]

[b]Dave - Saturday, January 28, 2017[/b]

[quote]

[b]jo700 - Saturday, January 28, 2017[/b]

[/quote]

Wow, thanks for your quick reply. That worked!

Thanks a lot!

[/quote]

RE: VAS: Visual Analogue Scale

jo700 — Sun, 29 Jan 2017 05:28:14 GMT

[quote]

[b]Dave - Saturday, January 28, 2017[/b]

[quote]

[b]jo700 - Saturday, January 28, 2017[/b]

[/quote]

Wow, thanks for your quick reply. That worked!

Thanks a lot!

RE: VAS: Visual Analogue Scale

Dave — Sat, 28 Jan 2017 02:15:26 GMT

[quote]

[b]jo700 - Saturday, January 28, 2017[/b]

[/quote]