define slide images inline - need to clear after each trial?

[jotaylor2306 at gmail.com]

Hi there,
I have a spelling task in which participants listen to a 3 phoneme word 
(consonant-vowel-consonant) and must select which 3 (from an array of 16) 
symbols spell that word, in the correct order.
They should see each selection appear on the screen, and after all 3 
symbols have been selected they should see the correctly spelled word 
alongside their own selections and receive correct/incorrect feedback.
They are spelling them in a new script they have learned so I can't use 
keyboard input as they are not Latin letters.

I have programmed the task by having each trial contain 4 slide objects:
stimslide1. Shows the array of symbols - same layout each trial
stimslide2. Shows the array of symbols - plus the symbol they selected on 
Slide 1
stimeslide3.  Shows the array of symbols - plus the symbols they selected 
on Slide 1 and Slide 2
stimslide4. Shows the array of symbols - plus the symbols they selected on 
Slides 1, 2, and 3. And also shows the correctly spelled word and a text 
object saying whether their spelling was correct or incorrect.


The inline code I have used to determine which slide image they selected 
(which is placed after stimstlide1 in the trialproc) is pasted below.


The problem I am having is that after trial 1, the image selections from 
the previous trial are displayed very briefly (i.e. they flash up) before 
the image selections from the current trial.
I am aware that I must need to clear the images from each trial, but can't 
figure out how to do so. I have the line  Set s1Image = Nothing as this 
seems to be good practice but tbh I am not sure what it does as this doesnt 
do what I would want it to do!

I have also tried adding an inline at the end of the trialproc that says 
s1Image.clear but I got a runtime error (Object variable or With block 
variable not set).

Could someone please tell me the proper way to clear images from trial to 
trial?
Thanks,
Jo



'This section determines which image they clicked on.
nCurrentResponse=0
bContinue=True


While bContinue<>False

If stimslide1.InputMasks.Responses.Count<>nCurrentResponse Then
nCurrentResponse=nCurrentResponse+1

Set 
theMouseResponseData=CMouseResponseData(stimslide1.InputMasks.Responses(nCurrentResponse))
If Not theMouseResponseData Is Nothing Then
strHit=stimslide1State.HitTest(theMouseResponseData.CursorX,theMouseResponseData.CursorY)

If strHit<>"" Then

Set theSlideImage=CSlideImage(stimslide1State.Objects(strHit))
If Not theSlideImage Is Nothing Then

bContinue=False

' this creates an attribute called LocChose1 that contains the Name of the 
Image they selected which is the same as its actual file name.
c.SetAttrib "LocChose1", strHit

If c.GetAttrib("LocChose1") = c.GetAttrib("Correct1") Then
 CountAcc=CountAcc+1
End If

End If
End If
End If
End If

' This section tells the programme to display the image they clicked on on 
the next slide (stimslide2) in the image called "Selection1" which by 
default is set to be a blank bmp file.
Dim  slImage as SlideImage
     
  Set slImage = 
CSlideImage(stimslide2.States("Default").Objects("Selection1")) 
     
' This retrieves the LocChose1 attribute which was the image they selected 
and adds the file extension so that the image can be displayed 
slImage.Filename  = c.GetAttrib("LocChose1")  & ".tif"
slImage.Load
stimslide2.Draw
        Set s1Image = Nothing 

Sleep 100
WEnd

 


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