The instructions are presented via images. There are various GIF files included with the script. To change the instructions, you have to either edit those GIFs or replace them with new ones.
Which set of GIFs is presented is determined by the device the script runs on, as you can see from the <include> elements:
**********************************************
The instruction slides used depend on
the type of device the game is played on
**********************************************
<include>
/ precondition = [
!computer.touch
]
/ file = "PSAP_intro.iqx"
</include>
<include>
/ precondition = [
computer.touch
]
/ file = "PSAP_intro_ios.iqx"
</include>
***********************************************************
these instructions will be run if the script is
run on a touchscreen
***********************************************************
<text touchscreenInstruct1>
/ items = ("General Note on Touchscreen Usage
for this Task:")
/ fontstyle = ("Arial", 5%, true, false, false, false, 5, 1)
/ position = (50%, 20%)
/ size = (80%, 20%)
/ vjustify = center
</text>
<text touchscreenInstruct2>
/ items = ("All necessary response buttons/keys will be provided at the bottom of your screen.
For example, here you see the <SPACEBAR>.
Tap it to continue to read instructions.")
/ fontstyle = ("Arial", 3%, true, false, false, false, 5, 1)
/ position = (50%, 50%)
/ size = (70%, 30%)
/ vjustify = center
</text>
You'll want to examine / edit the two *.iqx files referenced in the <include> elements accordingly, i.e., PSAP_intro.iqx and PSAP_intro_ios.iqx.
In the main script, the instruction images are presented via standard <picture>, <trial> and <block> elements:
**************************************************************************************************************
**************************************************************************************************************
INSTRUCTIONS
**************************************************************************************************************
**************************************************************************************************************
<picture instructions>
/items = instructions
/select = values.instruct_select
/position = (50%, 50%)
/size = (80%, 80%)
</picture>
<trial instructions>
/ontrialbegin = [values.instruct_select = values.instruct_select + 1]
/stimulusframes = [1 = instructions]
/validresponse = (48, 46)
/branch = [if (trial.instructions.response == 48 && values.instruct_select > 1) {values.instruct_select = values.instruct_select - 2; trial.instructions}]
/branch = [if (values.instruct_select < 7) trial.instructions]
</trial>
<block instructions>
/trials = [1 = touchscreenInstruct; 2 = instructions]
/recorddata = false
</block>
*****************************
General Helper Trial
*****************************
<trial touchscreenInstruct>
/ skip = [
!computer.touch
]
/ stimulusframes = [1 = touchscreenInstruct1, touchscreenInstruct2]
/ validresponse = (57)
/ recorddata = false
</trial>