Hi,
I have two experiments that require stimuli to be presented at different inter-stimulus intervals (IVI) and at three different locations on the screen. I have been able to create these, however, am struggling to find a way to ensure that the fixation cross stays on screen at all times. The way one is currently configured is to have a text display (pre-slide object in the session procedure timeline) with the fixation cross and its duration hyperlinked to the InterStimDuration attribute that I created in the list. I also have an attribute for space on screen (left, right, middle) and the respective stimuli- these are both hyperlinked to from the slide sub-object. In practice, this sees the cross fixation come up for the ISI, the stimuli then appear at their respective location and RT and accuracy are logged etc. My difficulty is that I want the fixation cross not to disappear when the stimuli are on screen. I have tried adding a cross to the object slide but this results in at worst a cross that jumps on the page and at best a flicker as it transitions from text display to slide object.
Is there a way of having this permanent fixation and having the stimuli presented at different locations to predetermined intervals?
Also, the second experiment is similar, though in this instance I am having the ISI be randomly drawn from between 100,4000 and its hyperlinked to from the fixation text display in inline, as follows:
Dim duration As Integer
duration= random(100,4000)
c.SetAttrib "FixDuration", ""
c.SetAttrib "FixDuration", duration
I again would like to have the fixation cross always present.
Please advise!
Laura