[solved]Playing beep during showing of a picture; trial ends after 6 seconds not when key is pressed

cnvanderwal

Hi there,

Can you help me correct my code? (I think I will need to use the sleep function, but don't know how..)
What I want:

-every trial starts with a fixation dot for 1 second
-then a picture shows for 6 seconds
-during the picture a beep plays (at SOA 1 or 4 seconds)
-person presses key 'z' or '/' to respond to the beep (high or low)
-(trial ends when picture is shown for 6 seconds, not when key is pressed after the beep)

-next trial...

So far I have made this code:

#first a sketchpad with a fixation dot for 1 sec
#then the following inline script:


from openexp.synth import synth

#create empty canvas to draw stimulus on in prepare phase
my_canvas = exp.canvas = self.offline_canvas()   
my_canvas.set_bgcolor('white')
my_canvas.clear()


#find right picture for current trial
if self.get('pict_valence') == 'positive':
    path_positive = exp.get_file('positive.png')
    my_canvas.image(path_positive)
elif self.get('pict_valence') == 'neutral':
    path_neutral = exp.get_file('neutral.png')
    my_canvas.image(path_neutral)
elif self.get('pict_valence') == 'negative':
    path_negative = exp.get_file('negative.png')
    my_canvas.image(path_negative)



#define low and high tone (beep)
if exp.get('tone_pitch') == 'high':
    exp.beep = synth(exp, freq= 2000, osc = "square", length=500)
elif exp.get('tone_pitch') == 'low':
    exp.beep = synth(exp, freq= 400, osc = "square", length=500)


#define SOA for the tone
SOA = exp.get("tone_SOA") 

#play tone
self.sleep(abs(SOA))
exp.beep.play()
self.sleep(6000 - abs(SOA))

Edwin

Hi,

First of all: you're almost there!

Second: let's clean up the code a bit, to make sure the experiment runs a bit more smoothly. Since you use the pictures and the sounds throughout the entire experiment, it makes more sense to initialize them at the start of the experiment. To do so, add an inline_script item to the very beginning of your experiment, and add the following contents:

# load the libraries that we will need
from openexp.canvas import canvas
from openexp.synth import synth
from openexp.keyboard import keyboard

# create three canvasses. each showing a different picture
# we will store these canvasses in a dictionary variable
# (see: http://anh.cs.luc.edu/python/hands-on/3.1/handsonHtml/dictionaries.html)
my_canvas = {}
for valence in ['positive', 'negative', 'neutral']:
    # create a new canvas, store it using the name for the valence
    exp.my_canvas[valence] = canvas(exp)
    # draw the image for this valence
    exp.my_canvas[valence].image(exp.get_file(valence+".png"))

# create two beeps, and store these in another dict
exp.beeps = {}
exp.beeps['high'] = synth(exp, freq= 2000, osc = "square", length=500)
exp.beeps['low'] = synth(exp, freq= 400, osc = "square", length=500)

# finally, create a keyboard object
exp.my_keyboard = keyboard(exp, keylist=['z','/'], timeout=None)

Now, in the trial sequence, insert the following code in the Run phase of an inline_script item (placed directly after the fixation_dot item):

# draw the correct canvas (and save the timestamp)
t0 = exp.my_canvas[self.get('pict_valence')].show()

# wait for the correct SOA
self.sleep(self.get('SOA'))

# play the correct beep (and save a timestamp)
exp.beeps[exp.get('tone_pitch')].play()
t1 = self.time()

# wait for input or a timeout (i.e. when 6 seconds pass from stimulus onset)
response, presstime = exp.my_keyboard.get_key(timeout=6000-self.get('SOA'))

# wait for some more to fill up the 6 seconds (only if a response was given)
if response != None:
    passed = presstime - t0
    self.sleep(6000 - passed)

# store some variables that can be accessed in other OpenSesame items
exp.set("response", response)
exp.set("response_time", presstime-t1)

(small disclaimer: code is untested, as I'm in a bit of a rush: please do not hesitate to post any potential errors arising when you run the scripts!)

cnvanderwal

Dear Edwin,

Thank you so much for your help.
It works :-)

I now need to add a small extra thing: there are 12 positive, 12 negative and 24 neutral pictures from which I randomly want to take one each trial.

I thought I could make lists of numbers, shuffle them and each time add the first item of this list to the image path (I named all images positive1.png, positive2.png, etc..)
But the canvasses are made in the beginning.

Can you help me?
Maybe make lists of canvasses in the beginning and later take a random one of this list?
Or do somethig with a if loop in the beginning?

Here is the code which I have made now (In the wrong place now).

# inline script beginning of experiment
# load the libraries that we will need
from openexp.canvas import canvas
from openexp.synth import synth
from openexp.keyboard import keyboard

# create three canvasses. each showing a different picture
# we will store these canvasses in a dictionary variable
# (see: http://anh.cs.luc.edu/python/hands-on/3.1/handsonHtml/dictionaries.html)
exp.my_canvas = {}
for valence in ['positive', 'negative', 'neutral']:
    # create a new canvas, store it using the name for the valence
    exp.my_canvas[valence] = canvas(exp)
    # draw the image for this valence
    exp.my_canvas[valence].image(exp.get_file(valence+".png"))

# create two beeps, and store these in another dict
exp.beeps = {}
exp.beeps['high'] = synth(exp, freq= 2000, osc = "square", length=500)
exp.beeps['low'] = synth(exp, freq= 400, osc = "square", length=500)

# finally, create a keyboard object
exp.my_keyboard = keyboard(exp, keylist=['z','/'], timeout=None)



#Run phase, trial sequence:

import random

#make 3 lists from numbers 1 till 12 or 24
#list1 and list2 are for positive and negative pictures (12 each)
#list3 will be for the neutral pictures (24 each)
list1 = [i for i in range(1,13) ]
list2 = [i for i in range(1,13) ]
list3 = [i for i in range(1,25) ]

#shuffle each list
random.shuffle(list1)
random.shuffle(list2)
random.shuffle(list3)

#save the lists
exp.list1 = list1 
exp.list2 = list2 
exp.list3 = list3 


# draw the correct canvas (and save the timestamp)
#if positive, take first item from list 1, then delete this item from the list. So that each trial one of the random numbers is taken. 

if exp.get('pict_valence') == 'positive':
    t0 = exp.my_canvas[self.get('pict_valence' + 'list1[0]' + '.png')].show()
    del(list1[0])
    list1 = list1

# wait for the correct SOA
self.sleep(self.get('tone_SOA'))

# play the correct beep (and save a timestamp)
exp.beeps[exp.get('tone_pitch')].play()
t1 = self.time()

# wait for input or a timeout (i.e. when 6 seconds pass from stimulus onset)
response, presstime = exp.my_keyboard.get_key(timeout=6000-self.get('tone_SOA'))

# wait for some more to fill up the 6 seconds (only if a response was given)
if response != None:
    passed = presstime - t0
    self.sleep(6000 - passed)

# store some variables that can be accessed in other OpenSesame items
exp.set("response", response)
exp.set("response_time", presstime-t1)

Edwin

Again, almost there!

This should be in the Prepare Phase of an inline_script at the start of your experiment:

# load the libraries that we will need
import random
from openexp.canvas import canvas
from openexp.synth import synth
from openexp.keyboard import keyboard

#make 3 lists from numbers 1 till 12 or 24
#list1 and list2 are for positive and negative pictures (12 each)
#list3 will be for the neutral pictures (24 each)
imglist = {}
imglist['positive'] = range(1,13)
imglist['negative'] = range(1,13)
imglist['neutral'] = range(1,25)

# randomize all of the lists
for valence in imglist.keys():
    random.shuffle(imglist[valence])

# create an empty canvas
exp.my_canvas = canvas(exp)

# create two beeps, and store these in another dict
exp.beeps = {}
exp.beeps['high'] = synth(exp, freq= 2000, osc = "square", length=500)
exp.beeps['low'] = synth(exp, freq= 400, osc = "square", length=500)

# finally, create a keyboard object
exp.my_keyboard = keyboard(exp, keylist=['z','/'], timeout=None)

This following should be in the Prepare Phase of the inline_script in your trial sequence:

# clear the canvas
exp.my_canvas.clear()

# get the path to the image
valence = exp.get("pict_valence'")
imgfile = exp.get_file(valence + str(imglist[valence].pop(0)) + ".png")

# draw the image for this valence
exp.my_canvas.image(imgfile)

And the following should be in the Run Phase of the same inline_script:

# draw the canvas (and save the timestamp)
t0 = exp.my_canvas.show()

# wait for the correct SOA
self.sleep(self.get('SOA'))

# play the correct beep (and save a timestamp)
exp.beeps[exp.get('tone_pitch')].play()
t1 = self.time()

# wait for input or a timeout (i.e. when 6 seconds pass from stimulus onset)
response, presstime = exp.my_keyboard.get_key(timeout=6000-self.get('SOA'))

# wait for some more to fill up the 6 seconds (only if a response was given)
if response != None:
    passed = presstime - t0
    self.sleep(6000 - passed)

# store some variables that can be accessed in other OpenSesame items
exp.set("response", response)
exp.set("response_time", presstime-t1)

Good luck!