Solutions to WPA4 (Events in a trial (feedback))

Inquisit code:

<defaults>  
 /quitcommand = (Ctrl+'e') 
 /fontstyle=("Arial", 3%)
</defaults>

<values>
 /accuracy = 50
</values>

<parameters>
 /pictures_size = 30%
 /pictures_position = 50%
</parameters>

### Define the stimuli
<item stimlistA>
 /1 = "wpa4_stimuli/patch1.png"
 /2 = "wpa4_stimuli/patch2.png"
 /3 = "wpa4_stimuli/patch3.png"
 /4 = "wpa4_stimuli/patch4.png"
 /5 = "wpa4_stimuli/patch5.png"
 /6 = "wpa4_stimuli/patch6.png"
 /7 = "wpa4_stimuli/patch7.png"
 /8 = "wpa4_stimuli/patch8.png"
 /9 = "wpa4_stimuli/patch9.png"
 /10 = "wpa4_stimuli/patch10.png"
 /11 = "wpa4_stimuli/patch11.png"
 /12 = "wpa4_stimuli/patch12.png"
 /13 = "wpa4_stimuli/patch13.png"
 /14 = "wpa4_stimuli/patch14.png"
 /15 = "wpa4_stimuli/patch15.png"
</item>

<item stimlistB>
 /16 = "wpa4_stimuli/patch16.png"
 /17 = "wpa4_stimuli/patch17.png"
 /18 = "wpa4_stimuli/patch18.png"
 /19 = "wpa4_stimuli/patch19.png"
 /20 = "wpa4_stimuli/patch20.png"
 /21 = "wpa4_stimuli/patch21.png"
 /22 = "wpa4_stimuli/patch22.png"
 /23 = "wpa4_stimuli/patch23.png"
 /24 = "wpa4_stimuli/patch24.png"
 /25 = "wpa4_stimuli/patch25.png"
 /26 = "wpa4_stimuli/patch26.png"
 /27 = "wpa4_stimuli/patch27.png"
 /28 = "wpa4_stimuli/patch28.png"
 /29 = "wpa4_stimuli/patch29.png"
 /30 = "wpa4_stimuli/patch30.png"
</item>

<picture A>
 /items = stimlistA
 /select = noreplace
 /position = (parameters.pictures_position, parameters.pictures_position)
 /size = (parameters.pictures_size, parameters.pictures_size)
</picture>

<picture B>
 /items = stimlistB
 /select = noreplace
 /position = (parameters.pictures_position, parameters.pictures_position)
 /size = (parameters.pictures_size, parameters.pictures_size)
</picture>

### Define the trial elements
<trial trialA>
 /stimulustimes = [1=A]
 /validresponse = ("a", "b")
 /correctresponse = ("a")
 /pretrialpause=1500
 /errormessage = true(wrong, 500)
 /correctmessage = true(right, 500)
 /ontrialend = [values.accuracy = (trial.trialA.percentcorrect + trial.trialB.percentcorrect)/2]
</trial>

<trial trialB>
 /stimulustimes = [1=B]
 /validresponse = ("a", "b")
 /correctresponse = ("b")
 /pretrialpause=1500
 /errormessage = true(wrong, 500)
 /correctmessage = true(right, 500)
 /ontrialend = [values.accuracy = (trial.trialA.percentcorrect + trial.trialB.percentcorrect)/2]
</trial>

<text right>
 /items=("CORRECT!")
 /position = (50%, 50%)
 /hjustify = center
 /fontstyle=("Arial", 10%)
 /txcolor=(0,0, 255)
</text>

<text wrong>
 /items=("INCORRECT!")
 /position = (50%, 50%)
 /hjustify = center
 /fontstyle=("Arial", 10%)
 /txcolor=(255,0, 0)
</text>

### Define pages
<page final_message>
Congratulations!

^^ You finished the experiment.

^^ You maintaned a performance of <%values.accuracy%> percent.
</page>


### Define the block and exp elements
<block choice_block>
 /trials = [1-30=noreplace(trialA, trialB)]
 /postinstructions = (page.final_message)
</block>

<expt>
 /blocks = [1=choice_block]
</expt>