心理实验中的试验处理与时间测量

Question

我想用psychopy里的TrialHandler类来组织一个Go-NoGo任务中的图片数据。

trials = data.TrialHandler(ImageList, nReps=1, method='random')

现在我想写一个循环，让psychopy从字典里取数据，先展示第一组图片（比如A_n），然后再展示第二组，一直到第六组。我试过以下代码：

import glob, os, random, sys, time
import numpy.random as rnd
from psychopy import visual, core, event, monitors, gui, logging, data
im_a = glob.glob('./a*')   # upload pictures of the a-type, gives out a List of .jpg-files
im_n = glob.glob('./n*')   # n-type
im_e = glob.glob('./e*')   # e-type

# combining Lists of Pictures
A_n = im_a + im_n
N_a = im_n + im_a
A_e = im_a + im_e
E_a = im_e + im_a
E_n = im_e + im_n
N_e = im_n + im_e

# making a Dictionary of Pictures and Conditions
PicList = [A_n, N_a, A_e, E_a, E_n, N_e]   # just the six Combinations
CondList = [im_a,im_n,im_a,im_e,im_e,im_n] # images that are in the GO-Condition
ImageList = []
for imagelist, condition in zip(PicList, CondList):
    ImageList.append({'imagelist':imagelist,'condition':condition}) # to associate the picturelist with the GO Conditionlist

在标题部分，我还问了一个额外的问题：如何合并和关联多个字典

# Set Experiment
win = visual.Window(color='white',units='pix', fullscr=False)
fixCross=visual.TextStim(win,text='+',color='black',pos=(0.0,0.0), height=40)
corrFb = visual.TextStim(win,text='O',height=40,color='green',pos=[0,0])
incorrFb = visual.TextStim(win,text='X',height=40, color='red',pos=[0,0])


# Start Experiement
trials = data.TrialHandler(ImageList, nReps=1, method='random')
rt_clock = core.Clock()
bitmap = visual.ImageStim(win)
for liste in ImageList[0:5]: # to loop through all 6 conditions
     keys = []   
     for i,Pictures in enumerate(liste): # to loop through all pictures in each condition
           bitmap.setImage(Pictures) # attribute error occurs, not if I use Pictures[0][0], even though in this case every pictures is the same
           bitmap.draw() 
           win.flip()
           rt_clock.reset()
           resp = False
           while rt_clock.getTime() < 2.0: # timelimit is defined 2 s
                if not resp:
                      resp = event.getKeys(keyList=['space'])
                      rt = rt_clock.getTime()
           if bool(resp) is (Pictures in CondList):  # at this point python should have access to the Dictionary in which the associated GO Pictures are saved
                corrFb.draw()
                accu=1 # doesn't work yet
           else:
                incorrFb.draw() 
                accu=0
           win.flip()
           core.wait(0.5)
           trials.addData('rt_'+str(i), rt) # is working well when loop: if trial in trials: ...; in this case trialHAndler is not used, therefor trials.addData is not working
           trials.addData('accu_'+str(i), accu)
trials.saveAsExcel(datanames)
core.quit()

这段代码有几个问题：首先，它只展示了一张图片六次，而不是六张不同的图片[1]

其次，还有一个完全不同的问题[2]是时间测量和准确度的保存，TrialHandler会为每个试次进行这些操作。所以它会把每个试次的反应时间（RT）加在一起。我想要的是每张图片的反应时间。我试过一些方法，比如为刺激创建一个额外的stimulus.trialhandler，以及在最后加一个额外的循环来获取最后的RT，但不是每张图片的RT。--> 下面有回答!!!

for stimuli in stimulus: stimulus.addData('rt', rt)

我知道这四个问题对于一个问题来说有点多，但也许有人可以给我一些好的建议，帮我解决这些问题...谢谢大家!

刺激呈现心理实验时间测量列表循环反应时间 go-nogo任务 trialhandler 列表数据处理

心理实验中的试验处理与时间测量

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