# \#windows **URL:** https://psychtoolbox.discourse.group/tag/windows/7.md [Latest](https://psychtoolbox.discourse.group/latest.md) · [Categories](https://psychtoolbox.discourse.group/categories.md) · [Tags](https://psychtoolbox.discourse.group/tags.md) --- ## [Compatibility of PsychToolbox DAQ functions with USB-200 series on Linux System](https://psychtoolbox.discourse.group/t/compatibility-of-psychtoolbox-daq-functions-with-usb-200-series-on-linux-system/5818)
**Author:** [@kchetnik](https://psychtoolbox.discourse.group/u/kchetnik)\ **Replies:** 0\ **Last updated:** [September 29, 2026, 9:30pm UTC](https://psychtoolbox.discourse.group/t/compatibility-of-psychtoolbox-daq-functions-with-usb-200-series-on-linux-system/5818 "2026-09-29T21:30:51Z")
I am trying to determine if a Measurement Computing Corporation (MCC) USB-200 series DAQ is compatible with Psychtoolbox out-of-the-box on Linux Ubuntu 22.04. Our lab is essentially trying to integrate another lab’s syst… --- ## [Experimental direct OpenGL-to-Metal presentation backend for Psychtoolbox on Apple Silicon](https://psychtoolbox.discourse.group/t/experimental-direct-opengl-to-metal-presentation-backend-for-psychtoolbox-on-apple-silicon/5811)
**Author:** [@keith](https://psychtoolbox.discourse.group/u/keith)\ **Replies:** 11\ **Last updated:** [September 21, 2026, 7:15pm UTC](https://psychtoolbox.discourse.group/t/experimental-direct-opengl-to-metal-presentation-backend-for-psychtoolbox-on-apple-silicon/5811 "2026-09-21T19:15:24Z")
Motivation I have been investigating the presentation-timing problems affecting Psychtoolbox on Apple Silicon under recent macOS versions. In particular, ordinary drawing and unscheduled flips can appear to work, while s… --- ## [VR Eye tracking](https://psychtoolbox.discourse.group/t/vr-eye-tracking/5757)
**Author:** [@pscarfe](https://psychtoolbox.discourse.group/u/pscarfe)\ **Replies:** 6\ **Last updated:** [September 9, 2026, 3:59pm UTC](https://psychtoolbox.discourse.group/t/vr-eye-tracking/5757 "2026-09-09T15:59:51Z")
Dear all, I would like to purchase a VR HMD with eye tracking that works with Psychtoolbox. From the following link with update notes it looks like eye tracking is supported in PTB via OpenXR. http://psychtoolbox.org/… --- ## [Invalid MEX-file error on MATLAB](https://psychtoolbox.discourse.group/t/invalid-mex-file-error-on-matlab/5797)
**Author:** [@Ghu](https://psychtoolbox.discourse.group/u/Ghu)\ **Replies:** 1\ **Last updated:** [April 3, 2026, 6:18pm UTC](https://psychtoolbox.discourse.group/t/invalid-mex-file-error-on-matlab/5797 "2026-04-03T18:18:26Z")
Hello, I am programming with MATLABR2023a for academic use and have encountered this error message several times: Invalid MEX-file ‘C:\\Psychtoolbox\\PsychBasic\\MatlabWindowsFilesR2007a\\Eyelink.mexw64’: The network path w… --- ## [Code check: Unusual reaction times (like less than 100 ms) for an AX-CPT task coded using PTB version 3.0.19](https://psychtoolbox.discourse.group/t/code-check-unusual-reaction-times-like-less-than-100-ms-for-an-ax-cpt-task-coded-using-ptb-version-3-0-19/5798)
**Author:** [@tylerdurden9591](https://psychtoolbox.discourse.group/u/tylerdurden9591)\ **Replies:** 1\ **Last updated:** [March 13, 2026, 8:09am UTC](https://psychtoolbox.discourse.group/t/code-check-unusual-reaction-times-like-less-than-100-ms-for-an-ax-cpt-task-coded-using-ptb-version-3-0-19/5798 "2026-03-13T08:09:26Z")
I am coding an AX-CPT task using PTB in MATLAB and while doing pilot testing, I am getting unusual RTs (Less than 100ms) when the participant is trying to do the task fast. Below are the details of the environment I am u… --- ## [Windows 11 Compatibility - requesting a statement to show IT](https://psychtoolbox.discourse.group/t/windows-11-compatibility-requesting-a-statement-to-show-it/5794)
**Author:** [@Dagmar](https://psychtoolbox.discourse.group/u/Dagmar)\ **Replies:** 3\ **Last updated:** [March 4, 2026, 4:29am UTC](https://psychtoolbox.discourse.group/t/windows-11-compatibility-requesting-a-statement-to-show-it/5794 "2026-03-04T04:29:51Z")
Hey Mario! We have been trying to request Windows 10 LTSC Edition from our Central IT as a back up for our upcoming fleet of Ubuntu machines - this will enable legacy paradigm to run without tweaking - and sidesteps the… --- ## [VBL endline beamposition queries and audio timestamping issues 2](https://psychtoolbox.discourse.group/t/vbl-endline-beamposition-queries-and-audio-timestamping-issues-2/5791)
**Author:** [@MBBP](https://psychtoolbox.discourse.group/u/MBBP)\ **Replies:** 4\ **Last updated:** [March 3, 2026, 6:46pm UTC](https://psychtoolbox.discourse.group/t/vbl-endline-beamposition-queries-and-audio-timestamping-issues-2/5791 "2026-03-03T18:46:58Z")
Psychtoolbox Version: 3.0.22 MATLAB Version: 2025b OS Name: Microsoft Windows 11 Enterprise Version: 10.0.22631 Processor: Intel(R) Core(™) Ultra 7 165H, 3800 Mhz, 16 Core(s), 22 Logical Processor(s) MATLAB: 9.13.0.… --- ## [First stimulus in Psychtoolbox trial consistently ~30 ms shorter than expected when chaining flips with vbl](https://psychtoolbox.discourse.group/t/first-stimulus-in-psychtoolbox-trial-consistently-30-ms-shorter-than-expected-when-chaining-flips-with-vbl/5786)
**Author:** [@YA87](https://psychtoolbox.discourse.group/u/YA87)\ **Replies:** 4\ **Last updated:** [February 15, 2026, 8:59pm UTC](https://psychtoolbox.discourse.group/t/first-stimulus-in-psychtoolbox-trial-consistently-30-ms-shorter-than-expected-when-chaining-flips-with-vbl/5786 "2026-02-15T20:59:57Z")
Hi everyone, I’m experiencing a consistent timing issue in my Psychtoolbox experiment. The very first stimulus in each trial (e.g., the fixation cross or the feedback after response window) is always about ~30 ms shorte… --- ## [GStreamer x Windows 11 issue](https://psychtoolbox.discourse.group/t/gstreamer-x-windows-11-issue/5782)
**Author:** [@ChildLabsAU](https://psychtoolbox.discourse.group/u/ChildLabsAU)\ **Replies:** 3\ **Last updated:** [January 28, 2026, 8:03pm UTC](https://psychtoolbox.discourse.group/t/gstreamer-x-windows-11-issue/5782 "2026-01-28T20:03:55Z")
support key: 0199aa85-0b7c-7d82-9ec1-6b585dd136b3 OS: Windows 11 (Acer PC) Matlab: R2024b PTB: latest stable (3.0.22.1) GStreamer: latest stable (1.26.10), “complete” install Hi, We’ve just had to update our OS fro… --- ## [Serial trigger to BrainVision TriggerBox stops working after OS upgrade (Windows 11)I](https://psychtoolbox.discourse.group/t/serial-trigger-to-brainvision-triggerbox-stops-working-after-os-upgrade-windows-11-i/5784)
**Author:** [@sg1021](https://psychtoolbox.discourse.group/u/sg1021)\ **Replies:** 5\ **Last updated:** [January 27, 2026, 4:07pm UTC](https://psychtoolbox.discourse.group/t/serial-trigger-to-brainvision-triggerbox-stops-working-after-os-upgrade-windows-11-i/5784 "2026-01-27T16:07:15Z")
Dear Community, Current environment: Windows 11 Psychtoolbox-3 (3.0.22.1) MATLAB R2025b Previous environment: Windows 10 Psychtoolbox-3 (3.0.19.3) MATLAB R2023 We run an EEG experiment using Brai… --- ## [Frame sequential stereo with Volfoni glasses and VPIXX](https://psychtoolbox.discourse.group/t/frame-sequential-stereo-with-volfoni-glasses-and-vpixx/5768)
**Author:** [@kevdent](https://psychtoolbox.discourse.group/u/kevdent)\ **Replies:** 2\ **Last updated:** [November 5, 2025, 5:06am UTC](https://psychtoolbox.discourse.group/t/frame-sequential-stereo-with-volfoni-glasses-and-vpixx/5768 "2025-11-05T05:06:45Z")
I am trying to use a VIEWPIXX 3D lite connected to a DataPixx3 to present 3-D stimuli using MatLab and the Psychophysics toolbox. I am using Volfoni glasses and a Volfoni emitter. The operating system is Windows 10 and t… --- ## [ASIO now dual licensed under GPLv3](https://psychtoolbox.discourse.group/t/asio-now-dual-licensed-under-gplv3/5764)
**Author:** [@aforren1](https://psychtoolbox.discourse.group/u/aforren1)\ **Replies:** 0\ **Last updated:** [October 22, 2025, 1:53pm UTC](https://psychtoolbox.discourse.group/t/asio-now-dual-licensed-under-gplv3/5764 "2025-10-22T13:53:05Z")
Maybe relevant to some? Press release, SDK page --- ## [Visual Stimuli Off by Factor of Refresh Rate](https://psychtoolbox.discourse.group/t/visual-stimuli-off-by-factor-of-refresh-rate/5763)
**Author:** [@123](https://psychtoolbox.discourse.group/u/123)\ **Replies:** 1\ **Last updated:** [October 21, 2025, 5:53pm UTC](https://psychtoolbox.discourse.group/t/visual-stimuli-off-by-factor-of-refresh-rate/5763 "2025-10-21T17:53:22Z")
Linux - Ubuntu 24.04.3 Kernel Version: 6.8.0-85-generic System: OptiPlex 7090 (0A52) Processor: Intel Core i9-10900 GPU: Advanced Micro Devices, Inc. \[AMD/ATI\] Lexa \[Radeon 540X/550X/630 / RX 640 / E9171 MCM\] GNU Oc… --- ## [Faint frame surrounding Gabor](https://psychtoolbox.discourse.group/t/faint-frame-surrounding-gabor/5762)
**Author:** [@Ghu](https://psychtoolbox.discourse.group/u/Ghu)\ **Replies:** 2\ **Last updated:** [October 3, 2025, 7:04am UTC](https://psychtoolbox.discourse.group/t/faint-frame-surrounding-gabor/5762 "2025-10-03T07:04:22Z")
Hello! Our lab is working on an experiment that involves the presentation of Gabors, but we are noticing a frame-like structure around all four sides of the Gabor that doesn’t fully blend in with the background. It is fa… --- ## [Intermittent synchronization failure](https://psychtoolbox.discourse.group/t/intermittent-synchronization-failure/5760)
**Author:** [@rdkirkden](https://psychtoolbox.discourse.group/u/rdkirkden)\ **Replies:** 4\ **Last updated:** [September 15, 2025, 8:53am UTC](https://psychtoolbox.discourse.group/t/intermittent-synchronization-failure/5760 "2025-09-15T08:53:53Z")
I’ve been trying to set up a new PC in one of our labs and am quite frequently, but not always, getting a ‘synchronization failure’ error when using Psychtoolbox to run MATLAB demos, or when typing the command ‘VBLSyncTe… --- ## [License management on air-gapped devices](https://psychtoolbox.discourse.group/t/license-management-on-air-gapped-devices/5750)
**Author:** [@hakam.nkassis](https://psychtoolbox.discourse.group/u/hakam.nkassis)\ **Replies:** 2\ **Last updated:** [August 7, 2025, 7:00am UTC](https://psychtoolbox.discourse.group/t/license-management-on-air-gapped-devices/5750 "2025-08-07T07:00:58Z")
3.0.22 - Flavor: Manual Install ———- Windows 11 Hi all, I have a PTB license for multiple devices, one of which is an air-gapped lab PC. The PC has to stay offline for data security reasons. Is there anyway to activate… --- ## [Sending triggers through parallel port to EEG amplifier](https://psychtoolbox.discourse.group/t/sending-triggers-through-parallel-port-to-eeg-amplifier/4909)
**Author:** [@Maria\_Coelho](https://psychtoolbox.discourse.group/u/Maria_Coelho)\ **Replies:** 7\ **Last updated:** [June 20, 2025, 12:06am UTC](https://psychtoolbox.discourse.group/t/sending-triggers-through-parallel-port-to-eeg-amplifier/4909 "2025-06-20T00:06:12Z")
Hi! I am running my experiment in PTB, while EEG is recording in brain vision recorder. I am having some difficulties in sending triggers through a parallel port. In previous topics I found this possible code: ioObj =… --- ## [Absolute scaling of texture values for HDR (BT2100) videos](https://psychtoolbox.discourse.group/t/absolute-scaling-of-texture-values-for-hdr-bt2100-videos/5722)
**Author:** [@mantiuk](https://psychtoolbox.discourse.group/u/mantiuk)\ **Replies:** 2\ **Last updated:** [June 6, 2025, 2:17pm UTC](https://psychtoolbox.discourse.group/t/absolute-scaling-of-texture-values-for-hdr-bt2100-videos/5722 "2025-06-06T14:17:56Z")
When reading frames from HDR video files (BT2100), the values in the textures seem to be in linear RGB BT.2020 colorspace, but absolute scaling of those values differs depending on how the corresponding Psychtoolbox wind… --- ## [PTB-ERROR: IMAGINGPIPE\_FLIPTWHEN variable assignment failed on macOS (works on Windows)](https://psychtoolbox.discourse.group/t/ptb-error-imagingpipe-fliptwhen-variable-assignment-failed-on-macos-works-on-windows/5685)
**Author:** [@ntcog](https://psychtoolbox.discourse.group/u/ntcog)\ **Replies:** 10\ **Last updated:** [April 28, 2025, 3:20pm UTC](https://psychtoolbox.discourse.group/t/ptb-error-imagingpipe-fliptwhen-variable-assignment-failed-on-macos-works-on-windows/5685 "2025-04-28T15:20:26Z")
Hi everyone, I’m encountering an issue when running my experiment code on macOS using Psychtoolbox. The error message is: PTB-ERROR: PsychPipelineProcessMacros: IMAGINGPIPE\_FLIPTWHEN variable assignment failed in runti… --- ## [Screen becomes black after experiment ends](https://psychtoolbox.discourse.group/t/screen-becomes-black-after-experiment-ends/5659)
**Author:** [@antimo](https://psychtoolbox.discourse.group/u/antimo)\ **Replies:** 4\ **Last updated:** [March 6, 2025, 12:21am UTC](https://psychtoolbox.discourse.group/t/screen-becomes-black-after-experiment-ends/5659 "2025-03-06T00:21:18Z")
Hi everyone, I have a strange issue with one of my PTB installations. After running an experiment, the screen that displays the stimuli becomes black. The only way to go back to normal is to close Matlab. Running Screen… --- ## [PTB's rendering is jumbled on Intel Arc graphics on MS-Windows](https://psychtoolbox.discourse.group/t/ptbs-rendering-is-jumbled-on-intel-arc-graphics-on-ms-windows/5652)
**Author:** [@JAQuent](https://psychtoolbox.discourse.group/u/JAQuent)\ **Replies:** 9\ **Last updated:** [February 26, 2025, 9:59am UTC](https://psychtoolbox.discourse.group/t/ptbs-rendering-is-jumbled-on-intel-arc-graphics-on-ms-windows/5652 "2025-02-26T09:59:50Z")
Background info I am trying to use PTB 3.0.19 on a Huawei laptop with Intel graphics that I bought for data collection. Currently I am running Windows 11 on it but it also persist on Windows 10. When I set the display t… --- ## [VBL SyncTrouble at 120 Hz and 40 Hz refresh rate but not at 60 Hz](https://psychtoolbox.discourse.group/t/vbl-synctrouble-at-120-hz-and-40-hz-refresh-rate-but-not-at-60-hz/5558)
**Author:** [@srijita](https://psychtoolbox.discourse.group/u/srijita)\ **Replies:** 5\ **Last updated:** [February 24, 2025, 11:28am UTC](https://psychtoolbox.discourse.group/t/vbl-synctrouble-at-120-hz-and-40-hz-refresh-rate-but-not-at-60-hz/5558 "2025-02-24T11:28:31Z")
Hello PTB community, Solved: My specific issue was solved by downgrading my AMD graphics driver version from 24.10.1 to 23.9.2, thanks @\_qx1147! Not sure what this means, but would be nice to learn more! Update 2: On … --- ## [Psychportaudio: play 3 audio through 3 MOTU speakers all at the same time](https://psychtoolbox.discourse.group/t/psychportaudio-play-3-audio-through-3-motu-speakers-all-at-the-same-time/5649)
**Author:** [@fasumed](https://psychtoolbox.discourse.group/u/fasumed)\ **Replies:** 0\ **Last updated:** [February 21, 2025, 7:29pm UTC](https://psychtoolbox.discourse.group/t/psychportaudio-play-3-audio-through-3-motu-speakers-all-at-the-same-time/5649 "2025-02-21T19:29:59Z")
I need to play 3 sound files through 3 spatially located loudspeakers(front, left, right) all at the same time. We have a MOTU sound system connected to the 3 loudspeakers, however, psychportaudio shows 2 available chan… --- ## [How to play 24 channel audio by motu sound card](https://psychtoolbox.discourse.group/t/how-to-play-24-channel-audio-by-motu-sound-card/4598)
**Author:** [@Maryam](https://psychtoolbox.discourse.group/u/Maryam)\ **Replies:** 13\ **Last updated:** [February 5, 2025, 8:32pm UTC](https://psychtoolbox.discourse.group/t/how-to-play-24-channel-audio-by-motu-sound-card/4598 "2025-02-05T20:32:25Z")
Hello! I want to use PsychPortAudio to play sound in 24Ao Motu sound card. we have 24 Speaker and we want to play mono sound in one speaker anytime. I know ASIO is supported by Motu, and find Motu in asioseetings()… --- ## [Synchronous Audio-visual speech stimuli presentation](https://psychtoolbox.discourse.group/t/synchronous-audio-visual-speech-stimuli-presentation/5628)
**Author:** [@fasumed](https://psychtoolbox.discourse.group/u/fasumed)\ **Replies:** 2\ **Last updated:** [January 25, 2025, 1:46pm UTC](https://psychtoolbox.discourse.group/t/synchronous-audio-visual-speech-stimuli-presentation/5628 "2025-01-25T13:46:42Z")
Hi everyone, I am designing an experiment where I will present AV speech ( a video of a person narrating a story) in a background of a mixture of noise. I need to play the audio and the visual of the AV talker separatel… --- ## [Invalid screen MEX file](https://psychtoolbox.discourse.group/t/invalid-screen-mex-file/5615)
**Author:** [@S.Obika](https://psychtoolbox.discourse.group/u/S.Obika)\ **Replies:** 4\ **Last updated:** [January 20, 2025, 12:06pm UTC](https://psychtoolbox.discourse.group/t/invalid-screen-mex-file/5615 "2025-01-20T12:06:27Z")
Hello. I am facing the issue with screen mex file. I know there are several similar issues that were posted previously but still I could not find a way to solve it. I would be grateful if you could help us to find a so… --- ## [Unable to install psychtoolbox on windows](https://psychtoolbox.discourse.group/t/unable-to-install-psychtoolbox-on-windows/5599)
**Author:** [@sternlas](https://psychtoolbox.discourse.group/u/sternlas)\ **Replies:** 2\ **Last updated:** [December 23, 2024, 6:09pm UTC](https://psychtoolbox.discourse.group/t/unable-to-install-psychtoolbox-on-windows/5599 "2024-12-23T18:09:51Z")
Hi, I am trying to install Psychtoolbox on Windows 10. I have previously been successful with installing it on this machine. I have tried different recent versions of Matlab but get the same error message. The error is: … --- ## [Screen Number Definition Behavior](https://psychtoolbox.discourse.group/t/screen-number-definition-behavior/5586)
**Author:** [@lmattar](https://psychtoolbox.discourse.group/u/lmattar)\ **Replies:** 5\ **Last updated:** [December 13, 2024, 6:34pm UTC](https://psychtoolbox.discourse.group/t/screen-number-definition-behavior/5586 "2024-12-13T18:34:35Z")
I am having an issue with proper detection of screen numbers in the most up to date version of psychtoolbox. We are running this program on a computer with windows 11, an AMD Ryzen 7 7700X CPU, and Gigabyte GAMING OC Rad… --- ## [PTB-WARNING: Flip for window 10 didn't use pageflipping for flip. Visual presentation timing and timestamps are likely unreliable!](https://psychtoolbox.discourse.group/t/ptb-warning-flip-for-window-10-didnt-use-pageflipping-for-flip-visual-presentation-timing-and-timestamps-are-likely-unreliable/5588)
**Author:** [@DEC\_labmanager](https://psychtoolbox.discourse.group/u/DEC_labmanager)\ **Replies:** 1\ **Last updated:** [December 13, 2024, 6:28pm UTC](https://psychtoolbox.discourse.group/t/ptb-warning-flip-for-window-10-didnt-use-pageflipping-for-flip-visual-presentation-timing-and-timestamps-are-likely-unreliable/5588 "2024-12-13T18:28:54Z")
Hello, we bought several laptops with an AMD Rembrandt iGPU and an AMD dGPU Navi 33 \[Radeon RX 7700S/7600/7600S/7600M XT/PRO W7600\], we installed the last version of Matlab 2024b and Psychtoolbox version 3.0.19.16 We h… --- ## [Matlab crashing as soon as Screen('OpenWindow') or PsychImaging('OpenWindow') invoked](https://psychtoolbox.discourse.group/t/matlab-crashing-as-soon-as-screen-openwindow-or-psychimaging-openwindow-invoked/5584)
**Author:** [@autopoiesis](https://psychtoolbox.discourse.group/u/autopoiesis)\ **Replies:** 1\ **Last updated:** [December 12, 2024, 9:53pm UTC](https://psychtoolbox.discourse.group/t/matlab-crashing-as-soon-as-screen-openwindow-or-psychimaging-openwindow-invoked/5584 "2024-12-12T21:53:37Z")
I have installed GStreamer (the correct variant) and Psychtoolbox per the instructions specified on the ptb site. GStreamer was installed BEFORE Psychtoolbox, as instructed. When trying to launch our experiment, we only … [Next page](https://psychtoolbox.discourse.group/tag/windows/7.md?match_all_tags=true&page=1&tags%5B%5D=windows)