如何在心理学中为每个试验设置刺激的方向

Question

我对 python 语言和心理学还很陌生。我正在通过创建虚拟实验来练习它。在这里，我试图创建一个关于贝叶斯大脑的实验。非垂直线将呈现给参与者，而参与者不会有任何反应，只是曝光。那么对于最后一次试行（它在显示器上停留更长的时间以得到响应），期望参与者判断最后一次试行是否垂直？（在暴露于非垂直线之后，我期待看到垂直度感知的变化）。

但是，有很多东西是我无法从网上学到的。我很确定你们可以轻松帮助我。

我的主要问题是；如何设置线的方向？我找到了 stim.ori 但不确定如何在 'line' 刺激下使用它。下面我附上了我到目前为止所做的代码。另外，我用 #.

添加了一些额外的问题

我尽量说清楚了。对不起，我的英语不好。谢谢！

from psychopy import visual, core, event #import some libraries from PsychoPy
import random

#create a window
mywin = visual.Window([800,600],monitor="testMonitor", units="deg")

#stimuli
lineo = visual.Line(mywin, start=(-5, -1), end=(-5, 1))
fixation = visual.GratingStim(mywin, size=0.2, pos=[0,0], color = 'black')

#draw the stimuli and update the window
n = 5 # trial number
i = 0
while i < n:
    #fixation
    fixation.draw()
    mywin.flip()
    presses = event.waitKeys(1)
    # stimulus
    orientationlist = [20,30,40,50,60] # I want to draw the orientation info from this list
    x = random.choice(orientationlist)
    lineo.ori((x)) #
    lineo.draw()
    mywin.flip()
    presses= event.waitKeys(2)
    i +=1
    if i == 5: # how do I change the number into the length of the trial; len(int(n) didnt work.
        lineo.draw()
        mywin.flip()
        presses = event.waitKeys(4)
    #quiting
    # I dont know how to command psychopy for quiting the
    # experiment when 'escape' is pressed.

#cleanup
mywin.close()
core.quit()

Answer 1

有几件事你想做一些不同的事情。我已经更新了您的代码并用注释 "CHANGE" 标记了更改。改变刺激的方向在精神病学中非常一致，因此 Line 与任何其他视觉刺激类型没有什么不同。

from psychopy import visual, core, event #import some libraries from PsychoPy
import random

#create a window
mywin = visual.Window([800,600],monitor="testMonitor", units="deg")

#stimuli
lineo = visual.Line(mywin, start=(-5, -1), end=(-5, 1))
fixation = visual.GratingStim(mywin, size=0.2, pos=[0,0], color = 'black')

orientationlist = [20,30,40,50,60] # CHANGED. No need to redefine on every iteration of the while-loop.
#draw the stimuli and update the window
n = 5 # trial number

for i in range(n):  # CHANGED. This is much neater in your case than a while loop. No need to "manually" increment i.
    #fixation
    fixation.draw()
    mywin.flip()
    event.waitKeys(1)  # CHANGED. No need to assign output to anything if it isn't used.
    # stimulus

    lineo.ori = random.choice(orientationlist)  # CHANGED. Alternative: lineo.setOri(random.choice(orientationlist)).
    lineo.draw()
    mywin.flip()
    event.waitKeys(2)

# At this point, all the stimuli have been shown. So no need to do an if-statement within the loop. The following code will run at the appropriate time
lineo.draw()
mywin.flip()
event.waitKeys(keyList=['escape'])  # CHANGED. Listen for escape, do not assign to variable
# CHANGED. No need to call core.quit() or myWin.close() here since python automatically cleans everything up on script end.

如何在心理学中为每个试验设置刺激的方向

how to set the orientation of the stimulus for each trial in psychopy

python

psychopy