How to copy randomized positions to the next display?
I would like to present 2,4 or 6 lines on the screen twice and ask to participant decide whether anything changed. On half of all trials, one item in the test display either change color or orientation compared to the memory display. It is a visual short term memory test. The problem is, i am using xy_circle to randomize positions of lines, but on the second display, all of lines changing their locations. All lines must be on the same location in two displays which presented in order.
I have one more issue which is less important. These lines have 5 different colors, and 4 orientations. In my design, I cannot control that change is color or orientation or both.
If anybody can help, i will be grateful. Thanks in advance!