visual analog scale (VAS)

[lncs]

Is there any way to implement a VAS in DirectRT (without MediaLab)?

[jarvis24]

Not with a moving slider, but you could work it out if you are ok with subjects simply clicking on a point on an image-based continuum. It would be done via setting up cursor regions.

e.g., see www.empirisoft.com/directrt/help/lightgun_touchscreen_cursor.htm

[lncs]

Could you create ten bmp files (more to increase the resolution) showing the indicator bar in increments from left to right, depending on the left or right button being selected, the appropraite bmp would be selected (giving the impression that the bar is moving to the left or right)?

[jarvis24]

Hmm, not sure I'm able to picture this. However, if you are asking if you could change or update the image based on where they click, then yes. You would see brief flash equal to the trial interval, but you could set up conditional jumps.

[lncs]

I think it would be easy to conceptulize if you think about a child's flip book, the main difrence being this could scroll either up or down depending on the the arrow key that is pressed.

If this is imposble to do in DirectRt, how would it look (accepting a screen refresh bettween frames) if you had unique trial for each frame.

I have attached 11 images that could be used to make a proof of concept.

[lncs]

Did this make any sense?

if you pressed the right arrow key it would be like the flip (scrolled through) book is moving being fliped to the right and if you pressed the left arrow key it would be like the book is being fliped (scrolled through) to the left.