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Another option is to use <list> elements in /stimulusframes to have the target <trial>s display either a <text> or <picture> stimulus. Suppose you have three "target A" image-items and 5 "target A" text-items.

<item targetApics>
/1 = "flower1.jpg"
/2 = "flower2.jpg"
/3 = "flower3.jpg"
</item>

<item targetAtxts>
/1 = "flower text item 1"
/2 = "flower text item 2"
/3 = "flower text item 3"
/4 = "flower text item 4"
/5 = "flower text item 5"
</item>

<picture targetApic>
/ items = targetApics
/ size = (20%, 20%)
</picture>

<text targetAtxt>
/ items = targetAtxts
/ fontstyle = ("Arial", 5%)
/ txcolor = white
</text>

You'd then set up a list like so:

<list targetA>
/ items = (picture.targetApic, picture.targetApic, picture.targetApic,
    text.targetAtxt, text.targetAtxt, text.targetAtxt, text.targetAtxt, text.targetAtxt)
/ resetinterval = 1
</list>

and set the target A trials' /stimulusframes to select from that list:

<trial targetAleft>
/ validresponse = ("E", "I")
/ correctresponse = ("E")
/ stimulusframes = [1 = list.targetA]
/ posttrialpause = 250
</trial>

<trial targetAright>
/ validresponse = ("E", "I")
/ correctresponse = ("I")
/ stimulusframes = [1 = list.targetA]
/ posttrialpause = 250
</trial>

(Full example attached).

Elements of the same *type* must have unique names. Here the type is "stimulus":

Suppose you have

<text a>
...
</text>

and

<picture a>
...
</picture>

with

<trial sometrial>
/ stimulusframes = [1=a]
...
</trial>

How is the trial supposed to know whether you want it to display the <text> or the <picture> element if both have the same name?

As for mixing text and image stimuli in an IAT, the least amount of effort is to simply use <picture> stimuli throughout and simply have images displaying your words: https://www.millisecond.com/forums/Topic12231.aspx?Keywords=picture-and-text-stimuli