stimulus still visible when same colour as background

beshoy.agayby's Avatar

beshoy.agayby

13 Mar, 2019 10:28 PM

Hi Chris,

I was testing a task where target (a disk) needs to be detected at random locations on the screen. When varying the colour values of the disk, i noticed that when the disk has the same colour values as the background, the borders of the disk are visible as a thin white line. It doesn't appear on the mirror window but only on the 2nd display. I tried a rectangle which was better (reduced borders), but still the same issue. Any idea what caused this?

Cheers,
Beshoy

  1. 1 Posted by beshoy.agayby on 14 Mar, 2019 12:25 PM

    beshoy.agayby's Avatar

    Hi Chris,
    Just an update, this issue only occurs with the ellipse stimulus not with the rectangle one.

    Cheers,
    Beshoy

  2. Support Staff 2 Posted by Christopher Sta... on 14 Mar, 2019 02:08 PM

    Christopher Stawarz's Avatar

    Hi Beshoy,

    I haven't been able to reproduce this issue yet. What color are the stimulus and background when you see the white line?

    Thanks,
    Chris

  3. 3 Posted by beshoy.agayby on 20 Mar, 2019 11:29 AM

    beshoy.agayby's Avatar

    Hi Chris,

    Sorry for the late reply. I tried reverting back to the 0.8 version as i was using a nightly version (not the latest one). I noticed that this issue isn't there anymore. And speaking of the nightly version, I tried to use the latest one and the stimulus didn't even come up. I will test it on another computer to be sure, but any idea why is this?

    Cheers,
    Beshoy

  4. Support Staff 4 Posted by Christopher Sta... on 20 Mar, 2019 01:09 PM

    Christopher Stawarz's Avatar

    Could you please send me an example experiment that demonstrates the issues you're seeing?

    Thanks,
    Chris

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