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• Hi anapinho, not a slider widget, but a similar solution that works with radio buttons: #!/bin/env python""" A radiobutton example in Expyriment."""__author__ = "Florian Krause <florian@expyriment.org>"…

  in Slider widget in Expyriment Comment by fladd September 2017
• Hi Ana Luísa, it does indeed relate to the resolution of the video. Expyriment does not perform any form of up or down scaling. Best, Florian

  in Cannot launch a movie under expyriment Comment by fladd July 2017
• You will need to install Expyriment 0.9.0, yes. But this version runs also under Python 2.7, so there is no need to install Python 3 if you do not want to.

  in Cannot launch a movie under expyriment Comment by fladd July 2017
• Hi, the new version of Expyriment (0.9.0) has a new Video stimulus. If you install it in the following way: python -m pip install expyriment[video] This should allow for mp4 videos to be played. Please also check the documentation at http://docs…

  in Cannot launch a movie under expyriment Comment by fladd July 2017
• @sebastiaan @imnotamember Yes, that is correct. Although we would love to have a native 3D stimulus type in Expyriment that directly operates on OpenGL enabled surfaces! Having this in Expyriment would directly benefit OpenSesame of course. Right …

  in Adding new Backend Comment by fladd June 2017
• Dear Sarah, I think there is some confusion about what the Aggregator in the data_preprocessing package does. Its purpose is to aggregate data from several participants into a single file by creating per-subject averages for all factor-level combin…

  in reading .xpd file Comment by fladd June 2017
• Hi Sarah, so you are saying you only get the aggregated data for the first subject? Are the data files of the remaining 19 subjects named in the same way (i.e. starting with nback)? I also don't understand why you define "button" and &qu…

  in reading .xpd file Comment by fladd June 2017
• The Expyriment log files are all saved in a standard comma separated value (csv) format, and it should hence be relatively straight forward to convert them into any other data structure or parse them with external tools if necessary. The block names…

  in reading .xpd file Comment by fladd June 2017
• Hi Sarah, you have add_data_variable_names in your code, which is a method, not an attribute, like data_variable_names which I suggested to use. Hence, either of the following two will work: 1. exp.add_data_variable_names(["response_keys"…

  in reading .xpd file Comment by fladd June 2017
• Hi Sarah, it seems that you forgot to add the data variable names to the data file. You have to define them once at the beginning of your experiment (see here for an example). In your case that would be: exp.data_variable_names = ["Response&…

  in reading .xpd file Comment by fladd June 2017
• Hi Juliette, I might miss something, but isn't your rule accessible at trials[0][2] at that point? I also did not understand why you need it to be defined as part of the block. Is this for logging purposes? (In that case, you could just do b.rule =…

  in add an small sentence before each block Comment by fladd June 2017
• Hi there, @sebastiaan When Expyriment detects that it is run from an interactive shell (i.e. ipython or IDLE) and that it is set to run in fullscreen mode, it will ask to switch to window mode, in order to stay interactive. This behaviour is neith…

  in Problems Ubuntu instalation and opensesame Comment by fladd June 2017
• Dear GuillermoTasero, you seem to be in the wrong forum. This is a forum about the Python package Expyriment. I will move this to the OpenSesame forum for you.

  in Random Presentation of Visual Stimuli Comment by fladd May 2017
• Dear GuillermoTasero, if you put your stimuli into Trials and those into a Block (let's call the object block for now, you can then simply shuffle all trials in a block by calling block.shuffle_trials()(see http://docs.expyriment.org/expyriment.des…

  in Random Presentation of Visual Stimuli Comment by fladd May 2017
• Yes, you can call expyriment.control.start with the argument skip_ready_screen=True (see also http://docs.expyriment.org/expyriment.control.html#expyriment.control.start)

  in Not displaying the logo Comment by fladd May 2017
• Oh I am sorry, I just realized that there actually is a way to not show the logo! (It has been so long ago since we implemented this...) Just run this before initializing: expyriment.control.defaults.initialize_delay = 0 Best, Florian

  in Not displaying the logo Comment by fladd May 2017
• Hi boris, There is currently no way to not show the logo at the beginning. However, as the logo is shown already in the initialize() method, I suggest to simply initialize the experiment before your participant enters the room. Experiment and Pyth…

  in Not displaying the logo Comment by fladd May 2017
• Dear Arnaud, you could use the current development version of Expyriment (which has the bug already fixed): * Download the source archive * Unzip the source archive * In the command line navigate into the unzipped directory and call: python setup.…

  in TouchScreen Comment by fladd April 2017
• Hi Juliette, the colour needs to be specified in RGB terms (e.g. [255, 0, 0] for red). To simplify this, we provide constants for common colours in expyriment.misc.constants (e.g. expyriment.misc.constants.C_RED for red). So in your particular case…

  in Colour of the stimuli Comment by fladd April 2017
• Glad to hear it is resolved. No need to delete the discussion though. Might be helpful for others in the future. Best, Florian

  in TouchScreen Comment by fladd April 2017
• Can you give me the full error message? My suspicion is that you have a file called test.py in the same directory, leading to overwriting the internal test package from future (which is a new dependency of Expyriment 0.9.0).

  in TouchScreen Comment by fladd April 2017
• The worst case scenario is that you have a jitter of unknown size, leading to (a) you not knowing when exactly the sound was actually played via the speakers, and (b) an unstable rhythm, when playing back sounds consecutively like you do.

  in 2 CallBack functions ? - SOLVED Comment by fladd April 2017
• To be honest, I do not understand what you are aiming to do in that code. The my_callback function does not do anything it seems (well, it checks for the keys, but it does nothing with the results of that check). If I do understand correctly what y…

  in 2 CallBack functions ? - SOLVED Comment by fladd April 2017
• Hi there, can you give a code example? In general, though, if you need very stable and precise audio timing, I would suggest to have the audio played by a dedicated hardware audio sampler, triggered via MIDI from the PC that records the responses.

  in 2 CallBack functions ? - SOLVED Comment by fladd March 2017
• Hi there, I am not sure what you mean with middle arrow key? In addition to left and right, there is also up (misc.constants.K_UP) and down (misc.constants.K_DOWN).

  in Middle arrow key Comment by fladd March 2017
• Hi Juliette, instead of open("se_de1.csv"), try to import codecs and then codecs.open("se_de_1.csv", encoding="utf-16"), and see whether that works.

  in Dispaly stimuli in blocks Comment by fladd March 2017
• Hi Juliette, how about this: # Save the excel file as .csv file (in Excel), then read it easily in Expyrimentdata = []with open("data.csv") as f: for line in f: data.append(line.strip().split(","))# Loop over sublists…

  in Dispaly stimuli in blocks Comment by fladd March 2017
• Glad I could help!

  in Triangle stimuli in a block Comment by fladd March 2017
• Hi Juliette, canvas.present()trial.stimuli[0].present(update=False)trial.stimuli[1].present(clear=False, update=False)trial.stimuli[2].present(update=False) What happens here is: * canvas is presented, but never seen on screen, as you immediately…

  in Triangle stimuli in a block Comment by fladd March 2017
• Actually, if you see this exact error (from above): log_txt = u"{0},{1}".format(log_txt, log_comment) UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 1: ordinal not in range(128) Then it seems that you are not usi…

  in all the trials of a block in a loop Comment by fladd March 2017
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