在 PsychoPy 中每 ... ms 或帧更新一次刺激属性

Question

我试图在 psychopy 编码器中每 100 毫秒左右更新一次 gratingStim 的方向。目前，我正在用这些行更新（或尝试）属性：

orientationArray = orientation.split(',') #reading csv line as a list
selectOri = 0 #my tool to select the searched value in the list
gabor.ori = int(orientationArray[selectOri]) #select value as function of the "selectOri", in this case always the first one
continueroutine = True
while continueroutine:
   if timer == 0.1: # This doesn't work but it shows you what is planned
        selectOri = selectOri + 1 #update value
        gabor.ori = int(orientationArray[selectOri]) #update value
        win.flip()

我找不到在所需时间范围内更新的正确方法。

Answer 1

每隔 x 帧执行某项操作的一种巧妙方法是将 modulo operation 与包含 win.flip() 的循环结合使用。因此，如果您想每 6 帧执行一次操作（在 60 Hz 显示器上为 100 毫秒），只需在每一帧执行此操作：

frame = 0  # the current frame number
while continueroutine:
    if frame % 6 == 0:  # % is modulo. Here every sixth frame
        gabor.ori = int(orientationArray[selectOri + 1])

    # Run this every iteration to synchronize the while-loop with the monitor's frames.
    gabor.draw()
    win.flip()
    frame += 1

在 PsychoPy 中每 ... ms 或帧更新一次刺激属性

Update stimulus attribute every ... ms or frame in PsychoPy

psychopy