I find that expyriment performs quite well when programmed correctly (see the attached file)

More raw data (.e.g. expeyrment event and data .xpe files) are available at https://github.com/chrplr/bbtkv2_python/tree/main/tests/expyriment

I intend to perform a more thorough investigation of timing when I find the time.

But this is enough to show that the Mega Study is quite misleading.

I get this error message when I put the expyriment.control.run_test_suit() at the beginning of the experiment:

File "experiment.py", line 11, in <module>

  control.run_test_suite()

 File "C:\Users\sarah\Anaconda3\lib\site-packages\expyriment\control\_test_suite.py", line 539, in run_test_suite

  from ..design import extras as _test1

 File "C:\Users\sarah\Anaconda3\lib\site-packages\expyriment\design\extras\__init__.py", line 20, in <module>

  from . import defaults

 File "C:\Users\sarah\Anaconda3\lib\site-packages\expyriment\design\extras\defaults.py", line 26, in <module>

  exec(_defaults)

 File "<string>", line 1

SyntaxError: (unicode error) 'unicodeescape' codec can't decode bytes in position 2-3: truncated \UXXXXXXXX escape

I use the pathlib libary for path handling, since I have a lot of stimuli I store only the path, as a string, in each trial - as a trial_factor (when building the design) - could this lead to the problem?

I am doing a project work on creativity and I am using the Free Association Task. 

A word is presented (20 words in total) and the participant has to write down as many words as possible that come to mind for the presented word. 

I guess the type form_text_input is already in the right direction, but the participant should not be able to click further, but should actually stay with the task for the complete minute. That means, he should not get the possibility to click to the next word. 

Is it possible to change the properties of form_text_input or is that not possible?

Many greetings,

Cognitionguy

I am running into a problem while initializing expyriment.

I get this error:

 File "S:/.....y", line 20, in <module> exp = control.initialize()
 File "S:\....\venv\lib\site-packages\expyriment\control\_experiment_control.py", line 438, in initialize no_frame=defaults.window_no_frame)
 File "S:\p....\venv\lib\site-packages\expyriment\io\_screen.py", line 123, in init if "ARB_texture_non_power_of_two" not in ogl_extensions: TypeError: a bytes-like object is required, not 'str'

from expyriment import control, stimuli, design, misc, io
control.set_develop_mode(False) 
.....
exp = control.initialize()

I have also tried adding this but I still get the same error:

control.defaults.window_no_frame = True

The script was running perfectly on my computer and now I am trying to run it through remote desktop and I get the error.

Thank you!

I'd like to measure the Audio Latency of a beep tone on my device while running Expyriment and I'd like to know what the software you used on the description in this page is: https://docs.expyriment.org/Timing.html

Additionally and just to confirm: in this description (Audio section), the latency measured refers to a sound played in Expyriment, doesn't it?

Thank you in advance.

Best,

Ana Luísa

I have the following snippet of code:

experiment.clock.reset_stopwatch()
key, rt = experiment.keyboard.wait(keys=[left_resp,
                                         right_resp],
                                   duration=duration_stimulus)
experiment.clock.wait(duration_stimulus - interval_tone - experiment.clock.stopwatch_time)

What I want is to send out a marker, at the time that a response (keypress) is made. However, the duration of the stimulus is fixed (1000ms), so sending a marker after the keyboard.wait function is not possible! Do you have an idea how to do this?

Thanks in advance for your help!

Beth

I am new in developing experimental designs in open sesame. I have included form_text_input item in my study but it is not running in JATOS external browser. The error is coming. Can anyone explain any other way as to how can I add this item and run it.

We are creating an experiment (n-back task) in OpenSesame in which we want to present symbols (as targets) alternated with images (as distractors). Participant has to indicate if the symbol is the same or different from the one presented twice before (2-back) by keyboard response. We have randomized the task symbols, but we are having difficulties in coding correct and incorrect responses (the answer is correct if the symbol showed at that moment matches with the one displayed twice before).

We used the following code for correct_response (var.target is the variable in the loop that contains the list of symbols): 

target = var.target
for i in range(len(target)):
  		if target[i] != target[i-2]:
    			var.correct_response = 'left'
  		elif target[i] == target[i-2]:
    			var.correct_response = 'right'
  		else:
    			raise ValueError('Invalid answer')

Unfortunately, using this code the program always recognizes as the correct response "left". Any ideas to solve this problem?

Thanks in advance for your help!  

Kind regards.

Following a recent mail exchange with Florian, I tranfer my issues to the forum to get some insight from the community.

For my first experiment I need to design an experiment using moving stimuli and I have to implement an expending or concentric movement on a circle (increase and decreasing the diameter of the circle in a way) and on annular gratings (Gabor Patch). So we conclude that it would be easier to just create videos of the stimuli and to present them.

So i went over the begginer's tutorial and tried to follow this example to create a very simple, 1 block, 4 stimuli experiment. I also follow the instruction about playing videos but I'm unsure on how to build and on how to code this efficiently. I coded the following experiment this morning but only return an error during the preloading of the video.

Anyway, I'll join what I coded so we can share thoughts and ways to improve things so that I can learn to efficiently code experiments in the future.

`import expyriment

exp = expyriment.design.Experiment(name="First Experiment")
expyriment.control.initialize(exp)

block_one = expyriment.design.Block(name="Block_1")

trial_one = expyriment.design.Trial()
trial_two = expyriment.design.Trial()
trial_three = expyriment.design.Trial()
trial_four = expyriment.design.Trial()

circle_s = expyriment.stimuli.Video('Circle_S.mp4')
circle_s.preload()
circle_s.play()
circle_s.present()
video_presentation_time = exp.clock.time
circle_s.wait_end()
circle_s.stop()

circle_e = expyriment.stimuli.Video('Circle_E.mp4')
circle_e.preload()
circle_e.play()
circle_e.present()
video_presentation_time = exp.clock.time
circle_e.wait_end()
circle_e.stop()

gabor_s = expyriment.stimuli.Video('Gabor_S.mp4')
gabor_s.preload()
gabor_s.play()
gabor_s.present()
video_presentation_time = exp.clock.time
gabor_s.wait_end()
gabor_s.stop()

gabor_e = expyriment.stimuli.Video('Gabor_E.mp4')
gabor_e.preloas()
gabor_e.play()
gabor_e.present()
video_presentation_time = exp.clock.time
gabor_e.wait_end()
gabor_e.stop()

trial_one.add_stimulus(circle_s)
trial_two.add_stimulus(circle_e)
trial_three.add_stimulus(gabor_s)
trial_four.add_stimulus(gabor_e)

block_one.add_trial(trial_one)
block_one.add_trial(trial_two)
block_one.add_trial(trial_three)
block_one.add_trial(trial_four)

exp.add_block(block_one)

expyriment.control.start()
for block in exp.blocks:
for trial in block.trials:
trial.stimuli[0].present()
exp.clock.wait(1000)

expyriment.control.end()`

Also; the error I get looks like :

Traceback (most recent call last): File "test.py", line 20, in <module> circle_s.preload() File "/home/jrdnalvs/anaconda3/envs/expyriment/lib/python3.4/site-packages/expyriment/stimuli/_video.py", line 303, in preload videorenderfunc=self._update_surface) File "/home/jrdnalvs/anaconda3/envs/expyriment/lib/python3.4/site-packages/mediadecoder/decoder.py", line 73, in __init__ if not self.load_media(mediafile, play_audio): File "/home/jrdnalvs/anaconda3/envs/expyriment/lib/python3.4/site-packages/mediadecoder/decoder.py", line 162, in load_media self.clip = VideoFileClip(mediafile, audio=play_audio) File "/home/jrdnalvs/anaconda3/envs/expyriment/lib/python3.4/site-packages/moviepy/video/io/VideoFileClip.py", line 91, in __init__ fps_source=fps_source) File "/home/jrdnalvs/anaconda3/envs/expyriment/lib/python3.4/site-packages/moviepy/video/io/ffmpeg_reader.py", line 33, in __init__ fps_source) File "/home/jrdnalvs/anaconda3/envs/expyriment/lib/python3.4/site-packages/moviepy/video/io/ffmpeg_reader.py", line 243, in ffmpeg_parse_infos is_GIF = filename.endswith('.gif') TypeError: endswith first arg must be bytes or a tuple of bytes, not str

thanks again for your time,

Going even further: I would maybe even want to change the experiment based on the input. For example, by choosing the language at the start screen. This is of course also possible in other ways (e.g:

str(input("Language: "))

However, this requires typing in the coder. It would be most neat to have it all in that start-screen, so people who aren't used to coding can use the GUI.

In short: how flexible is the start-screen and how to adapt it?

how could I end the experiment for a participant if he makes 4 incorrect responses in sequence !

Thanks

I have recently noticed a strange behaviour of linked response elements (tested for OpenSesame 3.3.5). As it seems, all information about the time for items after the first one in a sequence is wrong. To illustrate the problem, I have created a example experiment (see below) and used it to collect some test data (see below), to which I will now refer. When a linked response element is reached for the first time in an experiment, everything seems to work well. But when a linked response element is reached again, it calculates e.g. the 'response_time' incorrectly, it accumulates the time since its first use, which is easy to see in the spreadsheet, e.g. BT5 - BT7. Here an item with a timeout of 1000 ms registers a 'response_time' of 1000 ms on the first occurrence, a 'response_time' of 2000 ms on the second occurrence and a 'response_time' of 3000 ms on the third occurrence in the sequence. My guess is that everything depends on the 'time_*item name*'-variable, which for the tested response items is only updated when this item is first reached in the sequence. This is different from other items like 'skatchpads' where the 'time_*item name*'-variable is updated each time the specific item in the sequence is reached. This has the consequence that all time dependent calculations are corrupted.

It would be nice if someone could confirm this behaviour and tell me if it is the expected/intended behaviour or maybe a bug.

With kind regards,

Alexander

I have some additional lines at the end of my script/experiment that are performed after

control.end()

***do something else***

Is there a way to ensure that this part of the code will be performed even if the Esc button is pressed during the experiment, and the program quits?

Thanks

Also, how should I go about citing the use of this Gabor Patch Generator tool?

I am trying to develop mental workload with dual paradigm for my research. The task consist two blocks with first block using dot detection (perceptual) and the next block using n-back (cognitive). Is there any chance working this combine task using expyriment?, like how to set key response for different task (perceptual will using 1,2,3,4 key and n-back using z and m key.

Thanks!!

....
position1 = (250,0)
position2 = (0,0)
position3 = (-250,0)
#define and preload stimuli
happy = stimuli.Picture("images\happy.png", position=position1)
sad = stimuli.Picture("images\sad.png", position=position2)
angry = stimuli.Picture("images\angry.png", position=position3)
....

#present stimuli
happy.present(update=False)
sad.present(update=False, clear=False)
angry.present(clear=False)
....

I have a quick question: is it possible to show videos using the expyriment android runtime? It is very easy to do it with expyriment on my laptop but it doesn't work on my tablet.

I assume my installation on my android tab is ok because I can run basic examples without any problems. And before sending lines of codes to see if I made any mistake, I wanted to be sure first that it was possible.

Thanks a lot for your help.

Henri

I would like use a csv file.But when I use the "import csv",it doesn't work on Anriod.Is there a simple way to read a csv file on Anriod device?

Thanks!

I'm looking for a way of changing transparency (changing alpha value) of a given stimuli. I tried with extended Color syntax (r,g,b,a) like in pygame, but it doesn't work. API documentation also remind silent. There's an cannonical way of dealing with transparency in Expyriment?

Thank You in advance!

I was wondering whether it was possible to record audio as responses from the participants in an experiment? Could you give me some advice please. Should I use other libraries such as sound device ?

Thanks in advance.

Jérémy

To celebrate this, we released Expyriment 0.10!

Read all about it at https://www.expyriment.org/10-years/.

The new release includes many new features as well as important changes and bug fixes: https://github.com/expyriment/expyriment/releases

For installation instructions, please see http://docs.expyriment.org/Installation.html. 

The idea is to present many audio modules from a folder and as they appear the person write their answer (free text).

Thank you

I tried the expyriment test.suite on three different operating systems (Windows 10, unbuntu 18.04, and a Mac version) and I got visual_timing_inaccuracy of 7ms and a variable timing delay of >=95% on all systems. When we tried the Open Sesame test suite with the psychopy backend we had (on the Mac) a 0ms inaccuracy...

Here is the whole protocol of the test on the Linux computer: (had to copy and paste since I couldn't upldoad the file - deleted the opengl extension and the actual timing - if needed can copy below)

hardware_audio_card: HDA-Intel - HDA Intel PCH

hardware_cpu_architecture: x86_64

hardware_cpu_details: Intel(R) Core(TM) i7-6700 CPU @ 3.40GHz

hardware_cpu_type: x86_64

hardware_disk_space_free: 858079 MB

hardware_disk_space_total: 930177 MB

hardware_internet_connection: Yes

hardware_memory_free: 30845 MB

hardware_memory_total: 32045 MB

hardware_ports_parallel: ['parport0']

hardware_ports_parallel_driver: pyparallel

hardware_ports_serial: [<serial.tools.list_ports_linux.SysFS object at 0x7ff85a40b630>, <serial.tools.list_ports_linux.SysFS object at 0x7ff85a416ef0>, <serial.tools.list_ports_linux.SysFS object at 0x7ff85a416dd8>]

hardware_video_card:

os_architecture: 64bit

os_details: XFCE, xubuntu

os_name: Ubuntu

os_platform: Linux

os_release: 5.0.0-27-generic

os_version: 18.04

python_expyriment_build_date: Thu Mar 9 13:48:59 2017 +0100

python_expyriment_revision: c4963ac

python_expyriment_version: 0.9.0

python_mediadecoder_version:

python_numpy_version: 1.17.2

python_pil_version: 6.1.0

python_pygame_version: 1.9.6

python_pyopengl_version: 3.1.0

python_pyparallel_version: 0.3

python_pyserial_version: 3.4

python_sounddevice_version: 0.3.13

python_version: 3.6.8

settings_folder: None

testsuite_visual_flipping_user: 1

testsuite_visual_opengl: 2

testsuite_visual_opengl_renderer: b'Mesa DRI Intel(R) HD Graphics 530 (Skylake GT2) '

testsuite_visual_opengl_vendor: b'Intel Open Source Technology Center'

testsuite_visual_opengl_version: b'3.0 Mesa 19.0.8'

testsuite_visual_pygame_driver: x11

testsuite_visual_pygame_screensize: (2944, 1080)

testsuite_visual_sync_refresh_rate: 61.0 Hz

testsuite_visual_timing_actual: [#deleted cause rounded values below in timing_todo]

testsuite_visual_timing_delay_histogram: {0: 180}

testsuite_visual_timing_delayed: 95.0 %

testsuite_visual_timing_inaccuracy: 7 ms

testsuite_visual_timing_todo: [46, 49, 46, 15, 17, 32, 23, 58, 8, 16, 18, 11, 8, 39, 31, 6, 13, 48, 0, 3, 19, 3, 42, 30, 20, 2, 58, 48, 36, 19, 55, 48, 35, 26, 44, 22, 29, 31, 36, 50, 13, 43, 54, 27, 37, 43, 39, 38, 55, 41, 1, 42, 12, 22, 53, 41, 18, 8, 5, 40, 52, 3, 15, 6, 17, 29, 58, 7, 9, 33, 32, 36, 30, 57, 45, 45, 47, 44, 35, 46, 13, 27, 7, 34, 15, 40, 53, 44, 17, 14, 16, 50, 56, 57, 49, 12, 7, 14, 5, 55, 38, 42, 25, 23, 37, 33, 38, 24, 4, 26, 14, 32, 45, 12, 0, 52, 20, 24, 10, 6, 51, 51, 10, 25, 21, 21, 33, 34, 20, 5, 47, 49, 26, 54, 22, 11, 28, 47, 10, 16, 51, 59, 31, 24, 4, 37, 54, 28, 59, 53, 39, 56, 9, 35, 27, 59, 0, 40, 4, 21, 2, 1, 57, 23, 29, 56, 43, 11, 9, 19, 18, 2, 50, 25, 1, 28, 34, 41, 30, 52]

My questions: I don't really understand the results and what effects them - the explanation of within the documentations don't really help, since they only state what the output "visual_timing_inaccuracy" tests but not what can cause this value to be good (green - 0ms) or bad or what to do when it is bad) I read somewhere that the graphics card can cause a inaccuracy - all three systems have an internal graphics card, but that would not explain why we got a 0ms inaccuracy when using the psychopy backend within open sesame?

Can someone help me interpret the results and possible causes for the difference? My experiment is finished in expyriment but with these test results we cannot trust it...

Thank you!

I've been staring at this code for too long and don't seem to find the problem to the error messge: 'Block' object has no attribute 'trials'

The problem must lie in the design - when I build the hierarchy - but I double checked if I add all the trials to the block and the blocks to the experiment - and I checked whether I reach every level of the nested loops, and they do.

(I copy and paste the code, b/c there it doesn't allow me to upload an image eventhough it has a .jpg / .png extension? - SORRY)

# create experiment object

exp = design.Experiment(name='Inversion Effect')

control.initialize(exp)

# Define experiment hierarchy

# each category_block (faces_chairs, bodies_chairs) consits of 256 trials = total of 512 trials

for category_block_order in ['faces_chairs', 'bodies_chairs']:

  # each category_block is split up into 8 small experiments consiting of 32 trials each

  # --> each small experiment is represented by a block object (16 blocks in total - 8 faces_chairs + 8 bodies_chairs)

  for small_exp in range(8):

    block = design.Block()

    block.set_factor("category_order", category_block_order)

    #prepare variables needed based on between_subject variable

    if category_block_order == 'faces_chairs':

      categories = ['faces', 'chairs']

    else:

      categories = ['bodies', 'chairs']

    #prepare main path to get the stimuli

    path = Path.cwd() / category_block_order

    #each small experiment consists of 4x 8 unique conditions = 32 trials in total

    #Condition Design - 2x2x2 design: CATEGORY x ORIENTATION x DIRECTION --> 8 unique conditions

    for category in categories:

      for orientation in ['upright', 'inverted']:

        for direction in ['facing', 'non_facing']:

          trial = design.Trial()

          #get random path to one image within the stimulus_type

          stim_paths = path / category / orientation / direction

          if category == 'faces':

            stimulus = random.choice(list(stim_paths.rglob("*.tif")))

          else:

            stimulus = random.choice(list(stim_paths.rglob("*.jpg")))

          #get path to one mask

          mask_paths = path / 'masks'

          mask = random.choice(list(mask_paths.rglob("*.jpg")))

          #add stimulus and mask to trial

          trial.set_factor('target_stimulus', str(stimulus))

          trial.set_factor('orientation', orientation)

          trial.set_factor('direction', direction)

          trial.set_factor('mask', str(mask))

          #add the trial to the small experiment block

          block.add_trial(trial, copies=4)

    #shuffle the small experiment block and add the small experiment as a block to the experiment

    block.shuffle_trials()

    exp.add_block(block)

Any Ideas why this code doesn't properly create/initializes the block and trial objects?

Error message when calling trials/blocks:

for block in exp.blocks:

for trial in block.trials:

we would like to know if it is possible to synchronized two computers in a competition task and if it is possible to show the participants the correct and incorrect responses of the opponent.

Thank you!

experiment design goes here

pre_stim = my_stim[trial]
t_first = expyriment.stimuli.TextLine(text=pre_stim, text_bold = True, text_size=60)
t_trial = expyriment.design.Trial()
t_trial.add_stimulus(t_first)
if my_stim[trial] == '3' :
correct = 122
elif my_stim[trial] == '3' :
correct = 107
else:
correct = 122

It gave same answer in object '3' (122 not 107 in second row), then I try:

if my_stim[trial] == '3' and pre_stim == my_stim[0]:
correct = 122
elif my_stim[trial] == '3' and pre_stim == my_stim[1]:
correct = 107
else:
correct = 122
It also gave the exact same number in object '3'. Instead using list, do I have to use dict for delivering my stimuli?
Any suggest would be great!!
Thanks in advance