avoid flicker between (response) trials

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avoid flicker between (response) trials

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juliane_d	juliane_d posted 6 Years Ago Topic Details Share Topic
Group: Forum Members Posts: 12, Visits: 39	Hi there, I am programming an approach-avoidance task in which participants receive visual response feedback - e.g. the background image and stimulus size changes to create the impression of approaching or dtsiancing themselves from the stimulus (by moving within a virtual room) Unfortunately, the beginning of each trial always comes with a short flicker which highly disturbs the desired visual illusion. this seems to only happen, when i use an image for the background, not when I use shapes defined within inquisit, so it may be related to the loading time of the image (?). Any idea what I can do to avoid this? Many thanks! Juliane
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Dave	Dave posted 6 Years Ago ANSWER Post Details Share Post
Group: Administrators Posts: 13K, Visits: 104K	+x juliane_d - Thursday, March 8, 2018 Hi there, I am programming an approach-avoidance task in which participants receive visual response feedback - e.g. the background image and stimulus size changes to create the impression of approaching or dtsiancing themselves from the stimulus (by moving within a virtual room) Unfortunately, the beginning of each trial always comes with a short flicker which highly disturbs the desired visual illusion. this seems to only happen, when i use an image for the background, not when I use shapes defined within inquisit, so it may be related to the loading time of the image (?). Any idea what I can do to avoid this? Many thanks! Juliane This sounds like some of your stimulus elements displayed during the trial is not set to /erase = false, thus causing the flicker.
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juliane_d	juliane_d posted 6 Years Ago ANSWER Post Details Share Post
Group: Forum Members Posts: 12, Visits: 39	+x Dave - Thursday, March 8, 2018 +x juliane_d - Thursday, March 8, 2018 Hi there, I am programming an approach-avoidance task in which participants receive visual response feedback - e.g. the background image and stimulus size changes to create the impression of approaching or dtsiancing themselves from the stimulus (by moving within a virtual room) Unfortunately, the beginning of each trial always comes with a short flicker which highly disturbs the desired visual illusion. this seems to only happen, when i use an image for the background, not when I use shapes defined within inquisit, so it may be related to the loading time of the image (?). Any idea what I can do to avoid this? Many thanks! Juliane This sounds like some of your stimulus elements displayed during the trial is not set to /erase = false, thus causing the flicker. that was it! thanks for the quick help!!!
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anon8127365	anon8127365 posted 4 Years Ago ANSWER Post Details Share Post
Group: Forum Members Posts: 1, Visits: 1	I know that the problem was already solved, but it did not work for me (Using inquisit 5), so I tried some stuff out and it turns out that if you do this that it fixes the problem completely. <trial x> / stimulusframes = [ 1 = firststim 1 = secondstim 1 = thirdstim ] </trial> Just wanted to post this in case the previous answer did not work (I am super new at this, so it may be that this is really obvious, but I posted just in case).
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