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Inserting text half way through a trial

Jin — Wed, 19 Oct 2016 15:59:31 GMT

Hi all,

I am trying to have the text "please press the space bar when you're ready" appear after a 10 second delay on a screen that already has a question on it. I'm not sure if I should create two separate trials to, or if there's a way for it to appear on the screen?

I look forward to your responses!

Thank you,
Chu

<trial Ftr_ab>
/ branch = [trial.wait]
/ stimulustimes = [0=ftr_ab;1=PSA]
/ responseinterrupt = immediate
/ validresponse = (57)
/ inputdevice = keyboard
/ pretrialpause = 250
/ posttrialpause = 250
</trial>

<text PSA>
/ items = PSA
/ hjustify = center
/ vjustify = center
/ fontstyle = ("Arial", 2%, true)
/ size = (50%, 40%)
/ position = (50%, 85%)
/ select = noreplace
/ resetinterval = 0
/ txcolor = white
/ txbgcolor = black
</text>

<text Ftr_AB>
/ items = Ftr_AB
/ hjustify = center
/ vjustify = center
/ fontstyle = ("Arial", 8%, true)
/ size = (90%, 80%)
/ position = (50%, 50%)
/ select = noreplace
/ resetinterval = 0
/ txcolor = white
/ txbgcolor = black
</text>

RE: Inserting text half way through a trial

Dave — Wed, 19 Oct 2016 15:59:31 GMT

The <trial>'s /stimulustimes attribute dictates when stimuli should appear. If you want a stimulus appear at 10 seconds into the trial (i.e., 10000ms), you specify:

<trial sometrial>
/ stimulustimes = [0=...; 10000=the_text_element_you_want_to_display]
...
</trial>

If, additionally, you want the trial to accept responses *prior* to the appearance of that text stimulus at 10s seconds, you can specify that via /beginresponsetime.

<trial sometrial>
/ stimulustimes = [0=...; 10000=the_text_element_you_want_to_display]
...
/ beginresponsetime = 0
....
</trial>

To illustrate:

<trial sometrial>
/ stimulustimes = [0=a,b; 10000=spacebar]
/ beginresponsetime = 0
/ validresponse = (57)
</trial>

<text a>
/ items = ("some text...")
/ position = (50%, 50%)
</text>

<text b>
/ items = ("some other text...")
/ position = (50%, 55%)
</text>

<text spacebar>
/ items = ("Press the spacebar when you are ready.")
/ position = (50%, 90%)
</text>