Hi All,
I'm writing a code for an experiment that involves a fixation cross
and some stimuli that appear and disappear in the periphery.
The problem is that every time a new stimulus appears (by 'flip'ing
the buffer) the cross fixation slightly flickers, which might give the
S's a clue as to whether a stimulus has appeared or not. I know why
this happens (Screen('Flip') redoes the whole screen, and the cross
with it) but I was hoping there would be another way. Any suggestions
on how to fix this? Basically I just need a static fixation cross that
stays there unchanging, while some stimuli pop up and then disappear.
Thanks
I'm writing a code for an experiment that involves a fixation cross
and some stimuli that appear and disappear in the periphery.
The problem is that every time a new stimulus appears (by 'flip'ing
the buffer) the cross fixation slightly flickers, which might give the
S's a clue as to whether a stimulus has appeared or not. I know why
this happens (Screen('Flip') redoes the whole screen, and the cross
with it) but I was hoping there would be another way. Any suggestions
on how to fix this? Basically I just need a static fixation cross that
stays there unchanging, while some stimuli pop up and then disappear.
Thanks