How to randomise a picture or a Polygon

Builder
1

I would like to have a presented word flicker 2-4 times at random intervals within a 20-second period during an experiment. One idea is to briefly display an image with the fitting background color for 0.5 seconds, and repeat this process 2-4 times or to present a polygon to cover the words up shortly. Does anyone have any ideas on how to achieve this?

Thanks in advance
Marius

2

If the word is the entire contents of the text component (e.g. called text_word) then you could make it flicker three other ways without using an additional component.

  1. text_word.text = '' and then back to text_word.text = word
  2. text_word.setOpacity(0) and then back to text_word.setOpacity(1)
  3. text_word.setPos([2,2]) and then back to text_word.setPos([0,0])

It would also be possible to change the colour of the text to the background colour but that seems less logical.

You will need some Each Frame code. e.g.

if text_word.text == '' and t > timeChange:
     timeChange += 4 + random() * 4
     text_word.text = word
elif text_word.text == word and t > timeChange:
     timeChange += .5
     text_word.text = ''

You will need to set timeChange = 4 + random() * 4 in Begin Routine

3

Thank you for your quick reply! Would it be possible to solve this problem in the builders-mode, too? I’m very new in using Psychopy…

4

I only use Builder – but add code components to it.

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