NameError: name 'trials' is not defined

Coding
1

NameError: name ‘trials’ is not defined
I have run into this error on a trial. Below is some of the code I have.

#Draw the fixation and update the window
text_1.draw()
text_2.draw()
text_3.draw()
text_4.draw()
text_5.draw()
text_6.draw()
fixation.draw()
mywin.update()

core.wait(3.0)
mywin.update()

trials.data.add(‘Accuracy’, accuracy)
trials.data.add(‘Response’, responded[0])

trials.saveAsExcel(fileName=‘data.csv’,
sheetName = ‘rawData’,
stimOut=[],
dataOut=[‘all_raw’])
mywin.update()

I have seen somewhere an asnwer saying you must define in experiment box? What is this?
Any help would be appreciated

2

Sounds like you haven’t created a trial handler object - or have named it differently. Difficult to say from your code. Can you post the rest?

3

Hi Oli,

Thank you, thats pointed me the right way. The entire code for my experiment is:

#beginning of code for experiment!
from psychopy import visual, core, event #import some libraries from PsychoPy
trial_timer = core.Clock()

#create a window for the displaying of stimuli
mywin = visual.Window([1920,1080], monitor=“testMonitor”, units=“deg”)

#enter the text for the initial welcome message of the study
text_1 = visual.TextStim(win=mywin, name=‘text_4’,
text=u’On your way to safety you have been captured by the enemy. As a test to see if you are guilty the following test will be adminstered. Press any key when you are ready to continue’,
font=u’Arial’,
pos=(0, 0), height=0.7, wrapWidth=None, ori=0,
color=u’white’, colorSpace=‘rgb’, opacity=1,
depth=0.0)

#Here I’m going to place the fixation cross for my experiement
fixation = visual.GratingStim(win=mywin, size=0.15, pos=[0,0], sf=0, rgb=-1)

#Draw the fixation cross for subjects to see
#don’t actually need the fixation in yet
text_1.draw()
mywin.update()

#A button press will actually be needed here but that will need sorting later****

#this is the text for the start of the first block, which concerns which city was chosen
text_1 = visual.TextStim(win=mywin, name=‘text_4’,
text=u’Our inteligence tells us a certain city has been chosen blah blah blah’,
font=u’Arial’,
pos=(0, 0), height=0.7, wrapWidth=None, ori=0,
color=u’white’, colorSpace=‘rgb’, opacity=1,
depth=0.0)
text_1.draw()
core.wait(6)
mywin.update()

#button press needed

#pause so can inspect the message

text_1 = visual.TextStim(win=mywin, name=‘text_4’,
text=u’Berlin’,
font=u’Arial’,
pos=(9, 9), height=0.9, wrapWidth=None, ori=0,
color=u’white’, colorSpace=‘rgb’, opacity=1,
depth=0.0)

text_2 = visual.TextStim(win=mywin, name=‘text_4’,
text=u’Paris’,
font=u’Arial’,
pos=(17, 0.5), height=0.9, wrapWidth=None, ori=0,
color=u’white’, colorSpace=‘rgb’, opacity=1,
depth=0.0)

text_3 = visual.TextStim(win=mywin, name=‘text_4’,
text=u’Madrid’,
font=u’Arial’,
pos=(9, -7), height=0.9, wrapWidth=None, ori=0,
color=u’white’, colorSpace=‘rgb’, opacity=1,
depth=0.0)

text_4 = visual.TextStim(win=mywin, name=‘text_4’,
text=u’Prague’,
font=u’Arial’,
pos=(-9., -7), height=0.9, wrapWidth=None, ori=0,
color=u’white’, colorSpace=‘rgb’, opacity=1,
depth=0.0)

text_5 = visual.TextStim(win=mywin, name=‘text_4’,
text=u’Nice’,
font=u’Arial’,
pos=(-9, 9), height=0.9, wrapWidth=None, ori=0,
color=u’white’, colorSpace=‘rgb’, opacity=1,
depth=0.0)

text_6 = visual.TextStim(win=mywin, name=‘text_4’,
text=u’Salzberg’,
font=u’Arial’,
pos=(-17., -0.5), height=0.9, wrapWidth=None, ori=0,
color=u’white’, colorSpace=‘rgb’, opacity=1,
depth=0.0)
fixation = visual.GratingStim(win=mywin, size=0.15, pos=[0,0], sf=0, rgb=-1)

#need a button press here or before???

#Draw the fixation and update the window
text_1.draw()
text_2.draw()
text_3.draw()
text_4.draw()
text_5.draw()
text_6.draw()
fixation.draw()
mywin.update()

event.clearEvents()

core.wait(3) #always wait for 3 sec regardless when response was made
event.getKeys(‘q’‘y’)
mywin.update()

#now a blank screen for a bizzle
core.wait(6.0)
mywin.update()

#draw the stimuli cross
fixation = visual.GratingStim(win=mywin, size=0.15, pos=[0,0], sf=0, rgb=-1)
fixation.draw()
mywin.update()

#Now the second block of test
text_1 = visual.TextStim(win=mywin, name=‘text_4’,
text=u’Berlin’,
font=u’Arial’,
pos=(9, 9), height=0.9, wrapWidth=None, ori=0,
color=u’white’, colorSpace=‘rgb’, opacity=1,
depth=0.0)

text_2 = visual.TextStim(win=mywin, name=‘text_4’,
text=u’London’,
font=u’Arial’,
pos=(17, 0.5), height=0.9, wrapWidth=None, ori=0,
color=u’white’, colorSpace=‘rgb’, opacity=1,
depth=0.0)

text_3 = visual.TextStim(win=mywin, name=‘text_4’,
text=u’Lisbon’,
font=u’Arial’,
pos=(9, -7), height=0.9, wrapWidth=None, ori=0,
color=u’white’, colorSpace=‘rgb’, opacity=1,
depth=0.0)

text_4 = visual.TextStim(win=mywin, name=‘text_4’,
text=u’Brussels’,
font=u’Arial’,
pos=(-9., -7), height=0.9, wrapWidth=None, ori=0,
color=u’white’, colorSpace=‘rgb’, opacity=1,
depth=0.0)

text_5 = visual.TextStim(win=mywin, name=‘text_4’,
text=u’Helsinki’,
font=u’Arial’,
pos=(-9, 9), height=0.9, wrapWidth=None, ori=0,
color=u’white’, colorSpace=‘rgb’, opacity=1,
depth=0.0)

text_6 = visual.TextStim(win=mywin, name=‘text_4’,
text=u’Zurich’,
font=u’Arial’,
pos=(-17., -0.5), height=0.9, wrapWidth=None, ori=0,
color=u’white’, colorSpace=‘rgb’, opacity=1,
depth=0.0)
fixation = visual.GratingStim(win=mywin, size=0.15, pos=[0,0], sf=0, rgb=-1)

#Draw the fixation and update the window
text_1.draw()
text_2.draw()
text_3.draw()
text_4.draw()
text_5.draw()
text_6.draw()
fixation.draw()
mywin.update()

core.wait(3) #always wait for 3 sec regardless when response was made
event.getKeys(‘q’‘y’)
mywin.update()

END

Thanks

4

Yeah - trials hasn’t been added - you need to look up trial handlers. Effectively all of your code above would sit in a series of loops which would set your trials. This would be way easier in builder mode though, that will do all the hard work for you.

Also - please include your code between two sets of triple backticks - that way it gets formatted properly