编码多个列表和循环

Question

对于我的实验，我正在创建一个简单的反应时测试。它将有4个区块，每个区块6次试验。我已经成功地在屏幕上呈现了第一次试块，尽管是为了一轮练习（刺激确实出现了）。然而，我不确定我是否应该创建一系列的列表（即，为不同的试验保留不同的刺激），或者我是否应该改变我现有的一个循环的特征。我的代码如下：

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

#Create the code for saving the data at some point


#create a window
mywin = visual.Window([1920,1080], monitor="testMonitor", units="deg")
mywin.update()

# create the six stimuli:
Target = visual.TextStim(mywin, text = "text default")
text_stim_list = [] # a list to hold them
Stim_text = ["Berlin", "Paris", "London", "Nice", "Vienna", "Charming"] # 
their content

#the positions of the stimuli
positions = [
 (-10, 10),
 (10, 10),
 (-10, -10),
 (10, -10),
 (-1, -10),
 (1, 10),
 ]

 #Initial message to participants about the study 
 message1 = visual.TextStim(mywin, text = "You have been captured by the 
 plotters. As a test to see if you have information regarding the event, an 
on screen test will be adminstered. Press Spacebar when ready")
message1.draw()
mywin.update()

#this will wait for a button press confirmation from p's to continue
response = event.waitKeys(keyList = ['space',], timeStamped = True)

#Initial message to participants about the study 
message1 = visual.TextStim(mywin, text = "On the next screen, you will be 
presented with a practice round of stimuli. Press Q if any of the cities are 
familiar, or press P if you do not recognise the cities")
message1.draw()
mywin.update()

#this will wait for a button press confirmation from p's to continue
response = event.waitKeys(keyList = ['space',], timeStamped = True)

#Loop for drawing the stimulus 
#code for the keyboard response
keys = psychopy.event.waitKeys(keyList=["q", "p"])

#Practice round-should it be stopped by a button press?

for frameN in range(7*60):
# draw each stim *on each frame*
for i in range(len(Stim_text)):
    Target.setPos(positions[i])
    Target.setText(Stim_text[i])
    Target.draw()
# now flip the window (after all stimuli drawn)
mywin.flip()

 #Initial message to participants about the study 
message1 = visual.TextStim(mywin, text = "On the next screen, the cities 
which 
our intelligence tells us are at risk will be presented. Press Q if any are 
familiar, press P if not blah blah blah.. press space when ready")
message1.draw()
mywin.update()
response = event.waitKeys(keyList = ['space',], timeStamped = True)#wait for 
subjects to state they are ready

#Cities block
#First trial 

print Stim_text
del Stim_text[1,2]
print Stim_text

我很肯定这会涉及到改变循环的属性——否则，有这么多的列表是没有意义的。你知道吗

内森

Answer 1

一般来说，我会这样做：

# Run the code inside this loop four times
for block in range(4):
    for i, position in enumerate(positions):
        # Prepare stimulus
        Target.pos = position
        Target.text = Stim_text[i]

        # Show it 
        Target.draw()
        win.flip()

        # Collect response and score it
        key = event.waitKeys(keyList=['q', 'p'])[0]  # Just get the first response key
        # Save response here somehow.

正如Mike在一篇评论中指出的那样，看看psychopy.data.TrialHandler它可以为您做很多事情，包括保存数据。而且，不需要为每条消息生成一个新的visual.TextStim。只需用所需的文本更新现有文本。你知道吗