# Builder

**URL:** https://discourse.psychopy.org/c/builder/5.md

[Latest](https://discourse.psychopy.org/latest.md) · [Categories](https://discourse.psychopy.org/categories.md) · [Tags](https://discourse.psychopy.org/tags.md)

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## [About the Builder category](https://discourse.psychopy.org/t/about-the-builder-category/12)

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**Author:** [@jon](https://discourse.psychopy.org/u/jon)\
**Replies:** 3\
**Last updated:** [June 5, 2024, 2:56pm UTC](https://discourse.psychopy.org/t/about-the-builder-category/12 "2024-06-05T14:56:37Z")

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Use this category to get and give advice on creating experiments in Builder. If you know the answer to someone else's post then do get in there and help them out! You get badges and they earn you... well badges, man!

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## [Problems with recalibrating, Eyelink](https://discourse.psychopy.org/t/problems-with-recalibrating-eyelink/48199)

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**Author:** [@mtborneo](https://discourse.psychopy.org/u/mtborneo)\
**Replies:** 0\
**Last updated:** [October 21, 2026, 7:01pm UTC](https://discourse.psychopy.org/t/problems-with-recalibrating-eyelink/48199 "2026-10-21T19:01:18Z")

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PsychoPy version (e.g. 2024.2.4 Py 3.8): 2024.2.4 What are you trying to achieve?: I’m trying to have the option to recalibrate after breaks What did you try to make it work?: I have a driftcheck component after each b…

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## [FFPyPlayer intermittently crashing when trying to load video metadata](https://discourse.psychopy.org/t/ffpyplayer-intermittently-crashing-when-trying-to-load-video-metadata/46816)

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**Author:** [@Braden](https://discourse.psychopy.org/u/Braden)\
**Replies:** 7\
**Last updated:** [October 19, 2026, 9:42pm UTC](https://discourse.psychopy.org/t/ffpyplayer-intermittently-crashing-when-trying-to-load-video-metadata/46816 "2026-10-19T21:42:28Z")

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50 Shades.zip (31.3 KB) Videos can be downloaded from here Hi! I’ve been having a lot of difficulty troubleshooting the following error for the past week. This error occurs in the “other\_1” routine in the attached exp…

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## [Setting triggerbox in SerialOut component on Linux](https://discourse.psychopy.org/t/setting-triggerbox-in-serialout-component-on-linux/48107)

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**Author:** [@marwen](https://discourse.psychopy.org/u/marwen)\
**Replies:** 2\
**Last updated:** [October 12, 2026, 1:58pm UTC](https://discourse.psychopy.org/t/setting-triggerbox-in-serialout-component-on-linux/48107 "2026-10-12T13:58:46Z")

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OS: Ubuntu 22.04 PsychoPy version: 2026.2.0 Py 3.10 Standard Standalone Installation? (y/n): installed within uv environment Hello, I’m trying to send EEG triggers via triggerbox connected through USB. I tried using …

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## [Pavlovia authentication token expires every day – PsychoPy 2026.2.4](https://discourse.psychopy.org/t/pavlovia-authentication-token-expires-every-day-psychopy-2026-2-4/47948)

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**Author:** [@Noa1](https://discourse.psychopy.org/u/Noa1)\
**Replies:** 3\
**Last updated:** [October 12, 2026, 11:36am UTC](https://discourse.psychopy.org/t/pavlovia-authentication-token-expires-every-day-psychopy-2026-2-4/47948 "2026-10-12T11:36:39Z")

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OS (e.g. Win10): PsychoPy version (e.g. 2024.2.4 Py 3.8): Hi, I’m having a recurring authentication problem with Pavlovia in PsychoPy 2026.2.4 on Windows. Every day, when I try to use my Pavlovia project, I get the f…

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## [Plug-In Page is Illegible](https://discourse.psychopy.org/t/plug-in-page-is-illegible/48106)

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**Author:** [@atlasRobinson](https://discourse.psychopy.org/u/atlasRobinson)\
**Replies:** 0\
**Last updated:** [October 9, 2026, 1:24pm UTC](https://discourse.psychopy.org/t/plug-in-page-is-illegible/48106 "2026-10-09T13:24:45Z")

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PsychoPy version (e.g. 2024.2.4 Py 3.8): 2026.2.4 OS macOS Tahoe 26.6.2 Hello! I’m trying to install the VPixx and EyeLink plug-ins/toolboxes, but the screen it illegible (see attached photo). I’ve tried altering the …

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## [Builder problem mcbook neo](https://discourse.psychopy.org/t/builder-problem-mcbook-neo/48088)

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**Author:** [@luisa.dursel](https://discourse.psychopy.org/u/luisa.dursel)\
**Replies:** 1\
**Last updated:** [October 8, 2026, 9:53am UTC](https://discourse.psychopy.org/t/builder-problem-mcbook-neo/48088 "2026-10-08T09:53:20Z")

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OS = macOS 26.6.2 PsychoPy version = (v2024.2.1) Hello, I have a problem with PsychoPy that nobody seems able to solve. I have a MacBook Neo (2026) and I am using PsychoPy version 2024.2.1. I have an .xlsx file that …

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## [Program crashes with "IndexError: list index out of range" after running through a loop twice (but not after running through it only once)](https://discourse.psychopy.org/t/program-crashes-with-indexerror-list-index-out-of-range-after-running-through-a-loop-twice-but-not-after-running-through-it-only-once/48089)

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**Author:** [@FSchlaghecken](https://discourse.psychopy.org/u/FSchlaghecken)\
**Replies:** 3\
**Last updated:** [October 7, 2026, 12:59pm UTC](https://discourse.psychopy.org/t/program-crashes-with-indexerror-list-index-out-of-range-after-running-through-a-loop-twice-but-not-after-running-through-it-only-once/48089 "2026-10-07T12:59:44Z")

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If this template helps then use it. If not then just delete and start from scratch. OS (Win11): PsychoPy version (v 2026.2.2.): Standard Standalone Installation? y Do you want it to also run online? n What are you t…

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## [No speaker device found with index None’ when using external microphone](https://discourse.psychopy.org/t/no-speaker-device-found-with-index-none-when-using-external-microphone/47903)

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**Author:** [@mylinhtran.13](https://discourse.psychopy.org/u/mylinhtran.13)\
**Replies:** 10\
**Last updated:** [October 7, 2026, 9:45am UTC](https://discourse.psychopy.org/t/no-speaker-device-found-with-index-none-when-using-external-microphone/47903 "2026-10-07T09:45:11Z")

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OS: Windows 11 PsychoPy version: 2026.1.3 Standard Standalone Installation? Yes Do you want it to also run online? No Hi everyone, I’m running an experiment in which participants listen to short audio descriptions o…

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## [Problem with full screen](https://discourse.psychopy.org/t/problem-with-full-screen/48080)

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**Author:** [@Sebastien\_REHAL-IT](https://discourse.psychopy.org/u/Sebastien_REHAL-IT)\
**Replies:** 2\
**Last updated:** [October 7, 2026, 7:26am UTC](https://discourse.psychopy.org/t/problem-with-full-screen/48080 "2026-10-07T07:26:02Z")

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If this template helps then use it. If not then just delete and start from scratch. OS Windows 11 Professionnel PsychoPy version : 2024.2.1 I’d like to find a good thread/video/document that explains how to work with …

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## [No audio data in recording buffer](https://discourse.psychopy.org/t/no-audio-data-in-recording-buffer/48010)

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**Author:** [@Ichha\_Paramjeet](https://discourse.psychopy.org/u/Ichha_Paramjeet)\
**Replies:** 5\
**Last updated:** [October 2, 2026, 5:21pm UTC](https://discourse.psychopy.org/t/no-audio-data-in-recording-buffer/48010 "2026-10-02T17:21:39Z")

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OS (e.g. Win10): Win11 26200.9457 PsychoPy version (e.g. 2024.2.4 Py 3.8) Hi all, I’m sorry if this is a silly question with a simple fix- I’m operating through figuring PsychoPy out from the last 6 months of undergra…

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## [Movie loop psychopy error 3221225477](https://discourse.psychopy.org/t/movie-loop-psychopy-error-3221225477/48006)

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**Author:** [@lele](https://discourse.psychopy.org/u/lele)\
**Replies:** 13\
**Last updated:** [October 1, 2026, 3:51pm UTC](https://discourse.psychopy.org/t/movie-loop-psychopy-error-3221225477/48006 "2026-10-01T15:51:50Z")

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Hi everyone, I’m having an issue with a PsychoPy experiment using Movie components inside a loop. I’m using PsychoPy Standalone 2026.1.0 on Windows. The experiment starts normally and some videos play correctly, but a…

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## [Screen calibration not applied if full screen display](https://discourse.psychopy.org/t/screen-calibration-not-applied-if-full-screen-display/47950)

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**Author:** [@Raspail](https://discourse.psychopy.org/u/Raspail)\
**Replies:** 1\
**Last updated:** [September 25, 2026, 11:09am UTC](https://discourse.psychopy.org/t/screen-calibration-not-applied-if-full-screen-display/47950 "2026-09-25T11:09:40Z")

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OS (e.g. Win10): Win11 PsychoPy version (e.g. 2024.2.4 Py 3.8): 2026.2.3 Standard Standalone Installation? (y/n) If not then what?: y Do you want it to also run online? (y/n): n What are you trying to achieve?: EIZO…

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## [Data file delimiter set to semicolon, but automatic/crash-saved CSV uses commas (PsychoPy 2026.1.3)](https://discourse.psychopy.org/t/data-file-delimiter-set-to-semicolon-but-automatic-crash-saved-csv-uses-commas-psychopy-2026-1-3/47911)

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**Author:** [@richard\_naar](https://discourse.psychopy.org/u/richard_naar)\
**Replies:** 1\
**Last updated:** [September 21, 2026, 11:26am UTC](https://discourse.psychopy.org/t/data-file-delimiter-set-to-semicolon-but-automatic-crash-saved-csv-uses-commas-psychopy-2026-1-3/47911 "2026-09-21T11:26:11Z")

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Hi, I think I have found a possible inconsistency in how the Builder Data file delimiter setting is handled during normal saving versus PsychoPy’s automatic/fallback saving. Environment PsychoPy Builder 2026.1.3 W…

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## [PsychoPy Studio Linux 2026.2.4 AppImage builder has no demos](https://discourse.psychopy.org/t/psychopy-studio-linux-2026-2-4-appimage-builder-has-no-demos/47916)

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**Author:** [@JAQuent](https://discourse.psychopy.org/u/JAQuent)\
**Replies:** 2\
**Last updated:** [September 20, 2026, 9:59pm UTC](https://discourse.psychopy.org/t/psychopy-studio-linux-2026-2-4-appimage-builder-has-no-demos/47916 "2026-09-20T21:59:49Z")

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First of all, I think the new Linux route of using AppImages is a fantastic idea and worked pretty well. Thank you so much for this. However, and my apologies if I miss something very obvious, where are the demos for th…

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## [M2 Mac / Ventura 13.0: PsychoPy window opens but no Text/Textbox/Polygon is drawn, Esc does not respond](https://discourse.psychopy.org/t/m2-mac-ventura-13-0-psychopy-window-opens-but-no-text-textbox-polygon-is-drawn-esc-does-not-respond/47893)

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**Author:** [@Elizaveta\_Kiakhidi](https://discourse.psychopy.org/u/Elizaveta_Kiakhidi)\
**Replies:** 5\
**Last updated:** [September 18, 2026, 9:36am UTC](https://discourse.psychopy.org/t/m2-mac-ventura-13-0-psychopy-window-opens-but-no-text-textbox-polygon-is-drawn-esc-does-not-respond/47893 "2026-09-18T09:36:50Z")

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M2 MacBook, macOS Ventura 13.0, PsychoPy 2026.2.3 (Python 3.11; also tried 3.10). Experiment window opens and the background colour changes correctly, but no components appear — I tried Text, Textbox, and a Polygon. Esc…

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## [Problems with text display/wrap-up](https://discourse.psychopy.org/t/problems-with-text-display-wrap-up/47878)

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**Author:** [@mtborneo](https://discourse.psychopy.org/u/mtborneo)\
**Replies:** 2\
**Last updated:** [September 17, 2026, 2:12pm UTC](https://discourse.psychopy.org/t/problems-with-text-display-wrap-up/47878 "2026-09-17T14:12:35Z")

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Hi, I’m having a text-wrapping problem in PsychoPy Builder that I can’t figure out. I have a CSV file with 10 columns named “window1” through “window10” . In my PsychoPy routine, I have a Text component called “window”.…

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## [Microphone component not working - a device handle issue?](https://discourse.psychopy.org/t/microphone-component-not-working-a-device-handle-issue/47870)

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**Author:** [@vkrull](https://discourse.psychopy.org/u/vkrull)\
**Replies:** 2\
**Last updated:** [September 16, 2026, 4:03pm UTC](https://discourse.psychopy.org/t/microphone-component-not-working-a-device-handle-issue/47870 "2026-09-16T16:03:56Z")

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OS (e.g. Win10): macOS 26.6.2 PsychoPy version (e.g. 2024.2.4 Py 3.8): v2026.2.3 Standard Standalone Installation? (y/n) If not then what?: Yes, Standalone Do you want it to also run online? (y/n) N What are you try…

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## [Cant select Project in PsychoPy Builder](https://discourse.psychopy.org/t/cant-select-project-in-psychopy-builder/47867)

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**Author:** [@Samuel\_Clauss](https://discourse.psychopy.org/u/Samuel_Clauss)\
**Replies:** 2\
**Last updated:** [September 10, 2026, 12:46pm UTC](https://discourse.psychopy.org/t/cant-select-project-in-psychopy-builder/47867 "2026-09-10T12:46:39Z")

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OS: Win11 PsychoPy version (e.g. 2024.2.4 Py 3.8): 2026.2.3 Standard Standalone Installation? (y/n) Yes Do you want it to also run online? (y/n) Yes What are you trying to achieve?: I am building my first experiment…

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## [PsychoPy Builder GUI suddenly rearranged - Rebooting doesn't work](https://discourse.psychopy.org/t/psychopy-builder-gui-suddenly-rearranged-rebooting-doesnt-work/47863)

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**Author:** [@mcat\_95](https://discourse.psychopy.org/u/mcat_95)\
**Replies:** 0\
**Last updated:** [September 9, 2026, 4:25pm UTC](https://discourse.psychopy.org/t/psychopy-builder-gui-suddenly-rearranged-rebooting-doesnt-work/47863 "2026-09-09T16:25:22Z")

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The interface is completely rearranged and I cannot drag and drop any of the elements. I’ve tried uninstalling and reinstalling and clearing out the git on my local machine. To no avail, each time I open up any project,…

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## [PsychoPy Studio 2026.1.3 Version Control Issues](https://discourse.psychopy.org/t/psychopy-studio-2026-1-3-version-control-issues/47550)

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**Author:** [@jgeller112](https://discourse.psychopy.org/u/jgeller112)\
**Replies:** 3\
**Last updated:** [September 9, 2026, 11:41am UTC](https://discourse.psychopy.org/t/psychopy-studio-2026-1-3-version-control-issues/47550 "2026-09-09T11:41:22Z")

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on 2026.2.3 I am having some issues with version control. I saved a .psyexp as 2025.1.1 and tried to start it in Studio and am getting errors for that particular version. It is in the menu of available versions and packa…

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## [Experiment lagging when using ffpyplayer to play short video clips](https://discourse.psychopy.org/t/experiment-lagging-when-using-ffpyplayer-to-play-short-video-clips/47858)

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**Author:** [@nrh31](https://discourse.psychopy.org/u/nrh31)\
**Replies:** 0\
**Last updated:** [September 9, 2026, 9:56am UTC](https://discourse.psychopy.org/t/experiment-lagging-when-using-ffpyplayer-to-play-short-video-clips/47858 "2026-09-09T09:56:23Z")

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OS (e.g. Win10): Windows 11 Education PsychoPy version (e.g. 2024.2.4 Py 3.8): 2026.1.1 Standard Standalone Installation? (y/n) If not then what?: Y Do you want it to also run online? (y/n) N What are you trying to …

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## [Is there a "t" variable in Builder?](https://discourse.psychopy.org/t/is-there-a-t-variable-in-builder/30247)

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**Author:** [@PhoenixRising](https://discourse.psychopy.org/u/PhoenixRising)\
**Replies:** 7\
**Last updated:** [September 8, 2026, 3:01pm UTC](https://discourse.psychopy.org/t/is-there-a-t-variable-in-builder/30247 "2026-09-08T15:01:43Z")

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In the book “Buiding Experiments in PsychoPy” by Jonathan Peirce et al., the authors discuss building a moving stimulus and the strength of the “t” variable that exists in Builder. They describe as “t” providing a time…

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## [Can't change height of viewable textbox](https://discourse.psychopy.org/t/cant-change-height-of-viewable-textbox/47762)

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**Author:** [@bwilhelm098](https://discourse.psychopy.org/u/bwilhelm098)\
**Replies:** 2\
**Last updated:** [September 1, 2026, 7:10pm UTC](https://discourse.psychopy.org/t/cant-change-height-of-viewable-textbox/47762 "2026-09-01T19:10:58Z")

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OS: macOS Sequoia 15.7.9 PsychoPy version: 2026.2.1 3.11 Standard Standalone Installation? (y/n) Yes Do you want it to also run online? (y/n) No What are you trying to achieve?: I display the letter of consent at t…

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## [Calliberating keyboard response](https://discourse.psychopy.org/t/calliberating-keyboard-response/47602)

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**Author:** [@Saumya](https://discourse.psychopy.org/u/Saumya)\
**Replies:** 5\
**Last updated:** [August 28, 2026, 5:14pm UTC](https://discourse.psychopy.org/t/calliberating-keyboard-response/47602 "2026-08-28T17:14:59Z")

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Hi everyone, I’m designing a PsychoPy experiment where two participants press different keys on the same keyboard (e.g., A and L) at the same time. The timing difference between their keypresses is one of my main behavi…

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## [Creating an interleaved auditory staircase; how to calibrate decibel and PsychoPy values (builder)](https://discourse.psychopy.org/t/creating-an-interleaved-auditory-staircase-how-to-calibrate-decibel-and-psychopy-values-builder/47654)

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**Author:** [@neuronerd10283](https://discourse.psychopy.org/u/neuronerd10283)\
**Replies:** 1\
**Last updated:** [August 24, 2026, 6:12pm UTC](https://discourse.psychopy.org/t/creating-an-interleaved-auditory-staircase-how-to-calibrate-decibel-and-psychopy-values-builder/47654 "2026-08-24T18:12:48Z")

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OS (e.g. Win10): Linux Mint PsychoPy version (e.g. 2024.2.4 Py 3.8): 2024.2.4 Standard Standalone Installation? (y/n) If not, then what?: Yes Do you want it to also run online? (y/n) No What are you trying to achiev…

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## [Can't paste in Studio Builder](https://discourse.psychopy.org/t/cant-paste-in-studio-builder/47551)

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**Author:** [@matiasfduque](https://discourse.psychopy.org/u/matiasfduque)\
**Replies:** 3\
**Last updated:** [August 24, 2026, 11:21am UTC](https://discourse.psychopy.org/t/cant-paste-in-studio-builder/47551 "2026-08-24T11:21:25Z")

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I downloaded the lastest PsychoPy Studio (2026.2.1) directly from GitHub. I can’t seem to copy or paste anything when using the Builder (text, code, etc.). I’m on MacOS. Is anyone else having this issue?

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## [Running a classic oddball paradigm](https://discourse.psychopy.org/t/running-a-classic-oddball-paradigm/47440)

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**Author:** [@gilo20](https://discourse.psychopy.org/u/gilo20)\
**Replies:** 11\
**Last updated:** [August 20, 2026, 2:32pm UTC](https://discourse.psychopy.org/t/running-a-classic-oddball-paradigm/47440 "2026-08-20T14:32:36Z")

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Hello psychopy community! Feels like I’m shouting into the void but might as well give it a try! I’m a grad student in applied neuroscience writing my thesis about cognitive activity during an oddball paradigm task. I …

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## [Applet for merging multiple .psyexp files](https://discourse.psychopy.org/t/applet-for-merging-multiple-psyexp-files/15822)

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**Author:** [@ajus](https://discourse.psychopy.org/u/ajus)\
**Replies:** 9\
**Last updated:** [August 19, 2026, 9:47am UTC](https://discourse.psychopy.org/t/applet-for-merging-multiple-psyexp-files/15822 "2026-08-19T09:47:47Z")

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Hi! I often use different combinations of the same paradigms in my research, but copy-pasting routines and rebuilding loops every time is a nuisance. So I wrote a little applet to facilitate merging experiments. It allo…

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## [Cannot open specific builder file after an accidental end](https://discourse.psychopy.org/t/cannot-open-specific-builder-file-after-an-accidental-end/41423)

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**Author:** [@mari2812j35](https://discourse.psychopy.org/u/mari2812j35)\
**Replies:** 5\
**Last updated:** [August 19, 2026, 9:40am UTC](https://discourse.psychopy.org/t/cannot-open-specific-builder-file-after-an-accidental-end/41423 "2026-08-19T09:40:27Z")

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\*M1 Pro, Ventura 13.4.1 \*Psychopy v2024.2.1 There was an accidental end of Psychopy Runner. After this, ‘.psyexp’ file with which I’m working does not open with the error message below. Other files open well. What’s…

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