我制作了自己的评分量表，这是0到28:18的时间表。它根据人们按压“快速”的速度而变化。或者＆＃39; b＆＃39;每个试验的关键。屏幕上显示的内容如下所示：
experiment http://i58.tinypic.com/2hhgoj7.png
我希望每个试验的顶部时间重置为14:09。在每次试验之后是0.5秒的试验间隔，在此期间，一个＆＃39; +＆＃39;显示在屏幕上。我遇到的问题是，如果你按下＆＃39;或者＆＃39; b＆＃39;在ITI期间，下一次试验不会在14:09开始。相反，它会被一个＆＃39; t＆＃39;或者＆＃39; b＆＃39;按时移动时间线。这是我当前的代码，我试图纠正这个问题：
prevPos = 0
trialNum=0
b_list=[]
t_list=[]
key=[]
# loop through pictures
for eachPic in catPictures:
b_list=[]
t_list=[]
timer = core.CountdownTimer(TrialDuration)
while timer.getTime() > 0:
for key in event.getKeys():
if key in ['escape']:
core.quit() # quit if they press escape
if key in ['b']:
# add keypress to list for each keypress. then move cursor proportionally to length of this list
b_list.append(key)
prevPos+=len(b_list)
if key in ['t']:
t_list.append(key)
prevPos-=len(t_list)
# set upper and lower limits to where cursor can go (which will later be halved to restrict range of cursor on the screen)
if prevPos <= -849:
prevPos = -849
elif prevPos >=849:
prevPos = 849
# make absolute position so pos_absolute becomes a range from 0 to 300 (based on 28:18 min movie)
pos_absolute = prevPos + 849
# need to have range of 1698 (# of seconds in 28:18)
# need to have range of 1698 (# of seconds in 28:18)
# current range is 0 to 849 (which is 50% of 1698)
seconds = pos_absolute
Image2 = visual.ImageStim(window)
#curbImage2.setSize = ((0.5,0.5), units = 'norm')
# make a little higher than the absolute middle
Image2.setPos([0,100])
# use each image (i in curbImages)
Image2.setImage(catPictures[trialNum])
# define cursor that moves along timeline
cursorImage = visual.ImageStim(window)
cursorImage.setImage(directoryStim+'cursor.png')
# make cursor move by however big prevPos is
cursorImage.setPos([int(prevPos)*.5,int(400)])
# make the line
timeline = visual.SimpleImageStim(win=window, image=directoryStim+'line.png', units='pix', pos=[0, 400])
event.clearEvents() # get rid of other, unprocessed events
# print min and max values next to timeline
min = visual.TextStim(window, '0:00', color='Black', pos=[-500, 400])
max = visual.TextStim(window, '28:18', color='Black', pos=[500, 400])
# print constantly updating time value
timeText = visual.TextStim(window,'%d:%02d' % (seconds/60, seconds % 60),color='Black',wrapWidth=1080,font='Verdana', pos=[0,465], height=50)
## now put everything on the screen
Image2.draw(window)
min.draw(window)
max.draw(window)
timeText.draw(window)
timeline.draw(window)
cursorImage.draw(window)
## flip so it actually appears
window.flip()
ITI = visual.TextStim(window, '+', pos=[0,0], height=50, color='Black')
ITI.draw(window)
window.flip()
core.wait(.5,.5)
trialNum+=1
prevPos = 0
b_list =[]
t_list=[]
key=[]
在每次试用开始时，如何让我的时间线重置为14:09（又名prevPos = 0），即使有人按下＆＃39;或者＆＃39; b＆＃39;在审判结束时还是在审讯间隔期间？
答案 0 :(得分：1)
在代码的最后一行，试试这个：
event.clearEvents()
在您的ITI期间按下的键进入缓冲区，因此下次您致电event.getKeys()时将收集这些键。通过调用clearEvents()，您可以刷新该缓冲区。
答案 1 :(得分：1)
event.clearEvents()移至while - 循环之前
或core.wait之后。这就是你开始倾听新事物的地方
按键。等待期间的压力将返回
在下一个周期中调用event.getKeys()
而环。这就是它立即移动光标的原因。没有
真正有理由让event.clearEvents()拥有它
因为你只是在while循环中监听事件。这就是我的原因
建议您移动它而不是插入新的。ImageStims和TextStims
每次试验。 pos_absolute和seconds是多余的。您只能使用seconds。stim.setPos(x)你现在可以stim.pos = x等所有其他属性。这是从现在开始设置激励属性的首选方法（更清晰的代码，允许对属性进行更多操作）。以下是带有上述更改的清理代码：
# Stimuli
Image2 = visual.ImageStim(window)
cursorImage = visual.ImageStim(window)
min = visual.TextStim(window, '0:00', color='Black', pos=[-500, 400])
max = visual.TextStim(window, '28:18', color='Black', pos=[500, 400])
timeText = visual.TextStim(window,color='Black',wrapWidth=1080,font='Verdana', pos=[0,465], height=50)
ITI = visual.TextStim(window, '+', pos=[0,0], height=50, color='Black')
timeline = visual.SimpleImageStim(win=window, image=directoryStim+'line.png', units='pix', pos=[0, 400])
timer = core.CountdownTimer(TrialDuration)
# loop through pictures
trialNum=0
for eachPic in catPictures:
prevPos = 0
key=[]
b_list=[]
t_list=[]
timer.reset()
event.clearEvents() # get rid of other, unprocessed events
while timer.getTime() > 0:
for key in event.getKeys():
if key in ['escape']:
core.quit() # quit if they press escape
if key in ['b']:
# add keypress to list for each keypress. then move cursor proportionally to length of this list
b_list.append(key)
prevPos+=len(b_list)
if key in ['t']:
t_list.append(key)
prevPos-=len(t_list)
# set upper and lower limits to where cursor can go (which will later be halved to restrict range of cursor on the screen)
if prevPos <= -849:
prevPos = -849
elif prevPos >=849:
prevPos = 849
# make absolute position so pos_absolute becomes a range from 0 to 300 (based on 28:18 min movie)
# need to have range of 1698 (# of seconds in 28:18)
# need to have range of 1698 (# of seconds in 28:18)
# current range is 0 to 849 (which is 50% of 1698)
seconds = prevPos + 849
#curbImage2.size = ((0.5,0.5), units = 'norm')
# make a little higher than the absolute middle
Image2.pos = [0,100]
# use each image (i in curbImages)
Image2.image = catPictures[trialNum]
# define cursor that moves along timeline
cursorImage.image = directoryStim+'cursor.png'
# make cursor move by however big prevPos is
cursorImage.pos = [int(prevPos)*.5,int(400)]
timeText.text = '%d:%02d' % (seconds/60, seconds % 60))
## now put everything on the screen
Image2.draw(window)
min.draw(window)
max.draw(window)
timeText.draw(window)
timeline.draw(window)
cursorImage.draw(window)
## flip so it actually appears
window.flip()
ITI.draw(window)
window.flip()
core.wait(.5,.5)
trialNum+=1
请注意，我还删除了b_list，key等几个看似不必要的重置。