# Latest **URL:** https://psychtoolbox.discourse.group/latest.md?page=2 [Latest](https://psychtoolbox.discourse.group/latest.md) · [Categories](https://psychtoolbox.discourse.group/categories.md) · [Tags](https://psychtoolbox.discourse.group/tags.md) **Page:** 3 --- ## [Specify start and end time during multiple movie playback](https://psychtoolbox.discourse.group/t/specify-start-and-end-time-during-multiple-movie-playback/5687)
**Author:** [@saumil](https://psychtoolbox.discourse.group/u/saumil)\ **Replies:** 3\ **Last updated:** [May 25, 2025, 7:47pm UTC](https://psychtoolbox.discourse.group/t/specify-start-and-end-time-during-multiple-movie-playback/5687 "2025-05-25T19:47:16Z")
Hi, We have been playing multiple movies sequentially without a break by using async flag 4 for first movie and then 6 for all subsequent movies. And this is working very well. Now we want to specify a start and end fra… --- ## [Paid support membership support suspended until at least mid July 2025. 🌞](https://psychtoolbox.discourse.group/t/paid-support-membership-support-suspended-until-at-least-mid-july-2025/5713)
**Author:** [@mariokleiner](https://psychtoolbox.discourse.group/u/mariokleiner)\ **Replies:** 0\ **Last updated:** [May 25, 2025, 7:41pm UTC](https://psychtoolbox.discourse.group/t/paid-support-membership-support-suspended-until-at-least-mid-july-2025/5713 "2025-05-25T19:41:27Z")
It’s that time of the year. I’m exhausted like never before, and will go on a long vacation throughout June and bits of July, starting in a few days, using up all the carried over remaining vacation days from 2023 and 20… --- ## [Anyone used RTX 4060 with movie playback?](https://psychtoolbox.discourse.group/t/anyone-used-rtx-4060-with-movie-playback/5709)
**Author:** [@saumil](https://psychtoolbox.discourse.group/u/saumil)\ **Replies:** 1\ **Last updated:** [May 16, 2025, 9:57pm UTC](https://psychtoolbox.discourse.group/t/anyone-used-rtx-4060-with-movie-playback/5709 "2025-05-16T21:57:17Z")
Hi, Was wondering if RTX4060 works well with 4K movie playback using latest version of psychtoolbox ? Thanks, Best, Saumil --- ## [About multiple keyboards](https://psychtoolbox.discourse.group/t/about-multiple-keyboards/5704)
**Author:** [@wjl511061](https://psychtoolbox.discourse.group/u/wjl511061)\ **Replies:** 1\ **Last updated:** [May 14, 2025, 2:25am UTC](https://psychtoolbox.discourse.group/t/about-multiple-keyboards/5704 "2025-05-14T02:25:42Z")
Hey everyone! I’ve tried to use PTB in our experiments. In our experiment design, we’ve prepared 2 extra diy-keyboards, one contains numbers from 0-4 and the other contains 5-9. The code is as follows: ---------------… --- ## [Unable to set multi-screen (2 and more screens)](https://psychtoolbox.discourse.group/t/unable-to-set-multi-screen-2-and-more-screens/5696)
**Author:** [@ziyuan](https://psychtoolbox.discourse.group/u/ziyuan)\ **Replies:** 3\ **Last updated:** [May 9, 2025, 2:42pm UTC](https://psychtoolbox.discourse.group/t/unable-to-set-multi-screen-2-and-more-screens/5696 "2025-05-09T14:42:07Z")
Hi PTB community and team, I am trying to set up psychtoolbox to generate the 12bit precision stimuli for detecting the detection threshold. in order to get the 12bit precision, our lab follow the Document on Psychtoolbo… --- ## [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… --- ## [Inquiry Regarding PsychPortAudio('Stop') Function](https://psychtoolbox.discourse.group/t/inquiry-regarding-psychportaudio-stop-function/5689)
**Author:** [@yangzhangpsy](https://psychtoolbox.discourse.group/u/yangzhangpsy)\ **Replies:** 1\ **Last updated:** [April 15, 2025, 7:33pm UTC](https://psychtoolbox.discourse.group/t/inquiry-regarding-psychportaudio-stop-function/5689 "2025-04-15T19:33:54Z")
Dear Mario Kleiner, I have a quick question regarding the PsychPortAudio('Stop') function. According to the help documentation, this function is supposed to return four output parameters: \[audioStartTimeEnd, endPosition… --- ## [Setting up Psychtoolbox on Linux (Debian)- two screens](https://psychtoolbox.discourse.group/t/setting-up-psychtoolbox-on-linux-debian-two-screens/5545)
**Author:** [@Reuben](https://psychtoolbox.discourse.group/u/Reuben)\ **Replies:** 1\ **Last updated:** [April 10, 2025, 2:16am UTC](https://psychtoolbox.discourse.group/t/setting-up-psychtoolbox-on-linux-debian-two-screens/5545 "2025-04-10T02:16:19Z")
I thought I would include the guide I wrote after setting up Psychtoolbox on Linux in our lab. I am by no means an expert, but this procedure worked well for me so I thought it may be useful to others. Two-screen Linux … --- ## [LabJack on linux to read in inputs/triggers for screen flips in matlab](https://psychtoolbox.discourse.group/t/labjack-on-linux-to-read-in-inputs-triggers-for-screen-flips-in-matlab/5650)
**Author:** [@adeeti](https://psychtoolbox.discourse.group/u/adeeti)\ **Replies:** 6\ **Last updated:** [April 7, 2025, 7:42pm UTC](https://psychtoolbox.discourse.group/t/labjack-on-linux-to-read-in-inputs-triggers-for-screen-flips-in-matlab/5650 "2025-04-07T19:42:20Z")
Hi PTB community! I have a PTB3 installed on my ubuntu 22.04 laptop and have been using a labjack U3 for quite reliable TTL outputs for screen flips using the linux exodriver and following function: I would also like… --- ## [Unable to install psychtoolbox (beginner)](https://psychtoolbox.discourse.group/t/unable-to-install-psychtoolbox-beginner/5672)
**Author:** [@KogakuGura](https://psychtoolbox.discourse.group/u/KogakuGura)\ **Replies:** 2\ **Last updated:** [April 5, 2025, 5:09am UTC](https://psychtoolbox.discourse.group/t/unable-to-install-psychtoolbox-beginner/5672 "2025-04-05T05:09:05Z")
I apologize if this is rude as my native language is not English. I am trying to use Psychtoolbox for the first time and have installed it while looking at the Psychtoolbox website, but it is not working. I would like t… --- ## [Unable to display image on external monitor AMD laptop](https://psychtoolbox.discourse.group/t/unable-to-display-image-on-external-monitor-amd-laptop/5486)
**Author:** [@adeeti](https://psychtoolbox.discourse.group/u/adeeti)\ **Replies:** 8\ **Last updated:** [April 1, 2025, 5:59pm UTC](https://psychtoolbox.discourse.group/t/unable-to-display-image-on-external-monitor-amd-laptop/5486 "2025-04-01T17:59:59Z")
Authentication token: ANY4B-UP-2024827113311:2b28a796aa78935b57eba267c343dc7e405314cf628162f42acbd1aed89a1752 Hi PTB community and team, I am trying to set up psychtoolbox to display visual stimuli to mice for electroph… --- ## [Psychtoolbox 3.0.21.0 release "Fruity Aspirational Cashcow" 🐄](https://psychtoolbox.discourse.group/t/psychtoolbox-3-0-21-0-release-fruity-aspirational-cashcow/5673)
**Author:** [@mariokleiner](https://psychtoolbox.discourse.group/u/mariokleiner)\ **Replies:** 1\ **Last updated:** [March 31, 2025, 9:58am UTC](https://psychtoolbox.discourse.group/t/psychtoolbox-3-0-21-0-release-fruity-aspirational-cashcow/5673 "2025-03-31T09:58:35Z")
Psychtoolbox 3.0.21.0 “Fruity Aspirational Cashcow” :balloon::cow: :confetti\_ball: was released at 31st March 2025. You can download it as a zip file from the following link: https://github.com/Psychtoolbox-3/Psychtool… --- ## [Psychtoolbox 3.0.20.4 release "Sleight of Hand" 🫶](https://psychtoolbox.discourse.group/t/psychtoolbox-3-0-20-4-release-sleight-of-hand/5670)
**Author:** [@mariokleiner](https://psychtoolbox.discourse.group/u/mariokleiner)\ **Replies:** 0\ **Last updated:** [March 21, 2025, 7:31am UTC](https://psychtoolbox.discourse.group/t/psychtoolbox-3-0-20-4-release-sleight-of-hand/5670 "2025-03-21T07:31:14Z")
Psychtoolbox 3.0.20.4 “Sleight of Hand” :heart\_hands: was released at 21st March 2025. The complete development history can be found in our GitHub repository. The release tag is “3.0.20.4”, with the full tree and commi… --- ## [Psychtoolbox Issue After macOS Sequoia 15.3.1 Update](https://psychtoolbox.discourse.group/t/psychtoolbox-issue-after-macos-sequoia-15-3-1-update/5665)
**Author:** [@dilanazn](https://psychtoolbox.discourse.group/u/dilanazn)\ **Replies:** 4\ **Last updated:** [March 13, 2025, 3:26pm UTC](https://psychtoolbox.discourse.group/t/psychtoolbox-issue-after-macos-sequoia-15-3-1-update/5665 "2025-03-13T15:26:33Z")
Hello Psychtoolbox community, I’m encountering issues with my Psychtoolbox code after updating my macOS to Sequoia 15.3.1. The code, which is quite extensive, was functioning correctly before the update. Now, it’s faili… --- ## [Endless loop during installation](https://psychtoolbox.discourse.group/t/endless-loop-during-installation/5656)
**Author:** [@jskim628](https://psychtoolbox.discourse.group/u/jskim628)\ **Replies:** 7\ **Last updated:** [March 7, 2025, 1:06am UTC](https://psychtoolbox.discourse.group/t/endless-loop-during-installation/5656 "2025-03-07T01:06:37Z")
When running SetupPsychtoolbox.m, I see the error below. I have installed the necessary runtime libraries, but this still continues, thus I am stuck in an endless loop. I am using MATLAB2024B, Psychtoolbox 3.0.20.3, on a… --- ## [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… --- ## [PsychHID and wheel](https://psychtoolbox.discourse.group/t/psychhid-and-wheel/5654)
**Author:** [@keith](https://psychtoolbox.discourse.group/u/keith)\ **Replies:** 8\ **Last updated:** [March 5, 2025, 2:17am UTC](https://psychtoolbox.discourse.group/t/psychhid-and-wheel/5654 "2025-03-05T02:17:52Z")
I’m not sure how my post got hijacked into the other thread. Anyway, GetMouseWheel doesn’t work, it is just zero for the first call and then for the second and subsequent, it returns zero again after a few seconds. But t… --- ## [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… --- ## [Play many movies back-to-back without significant gap between them](https://psychtoolbox.discourse.group/t/play-many-movies-back-to-back-without-significant-gap-between-them/5642)
**Author:** [@saumil](https://psychtoolbox.discourse.group/u/saumil)\ **Replies:** 9\ **Last updated:** [February 24, 2025, 3:45pm UTC](https://psychtoolbox.discourse.group/t/play-many-movies-back-to-back-without-significant-gap-between-them/5642 "2025-02-24T15:45:17Z")
Hi, We are using Psychtoolbox on Linux in Matlab 2024. We want to play a sequence of videos (there may be over 1000 videos) without any noticeable break between the videos. Each video has 1920x1080 pixels frames and wil… --- ## [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… --- ## [PsychPortAudio freezes after first sound](https://psychtoolbox.discourse.group/t/psychportaudio-freezes-after-first-sound/5639)
**Author:** [@baptiste](https://psychtoolbox.discourse.group/u/baptiste)\ **Replies:** 3\ **Last updated:** [February 11, 2025, 9:36pm UTC](https://psychtoolbox.discourse.group/t/psychportaudio-freezes-after-first-sound/5639 "2025-02-11T21:36:05Z")
Hello. I experience an issue with PsychPortAudio on Ubuntu 22.04.4 LTS. I use the PTB 3.0.19.64715640, and PsychPortAudio 3.0.19.64657228. When running an experiment that used to work fine on another system, PsychPortA… --- ## [Interference when using two mice](https://psychtoolbox.discourse.group/t/interference-when-using-two-mice/5638)
**Author:** [@CSchranz](https://psychtoolbox.discourse.group/u/CSchranz)\ **Replies:** 4\ **Last updated:** [February 7, 2025, 11:07am UTC](https://psychtoolbox.discourse.group/t/interference-when-using-two-mice/5638 "2025-02-07T11:07:17Z")
Hello, I am trying two read the input of two mice from two screen in Ubuntu 20.4 in Matlab 2024a with Psychtoolbox 3.0.19.14. I am using this to let two participants that each have a mouse and a screen to rate and expe… --- ## [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()… --- ## [Psychtoolbox 3.0.20.2/3 release “Appletizer” SP2/3 🐍](https://psychtoolbox.discourse.group/t/psychtoolbox-3-0-20-2-3-release-appletizer-sp2-3/5632)
**Author:** [@mariokleiner](https://psychtoolbox.discourse.group/u/mariokleiner)\ **Replies:** 0\ **Last updated:** [February 1, 2025, 3:47am UTC](https://psychtoolbox.discourse.group/t/psychtoolbox-3-0-20-2-3-release-appletizer-sp2-3/5632 "2025-02-01T03:47:43Z")
Happy new year of the Wood Snake! Psychtoolbox 3.0.20.2 “Appletizer SP2” was released at 1st February 2025. Update: Psychtoolbox 3.0.20.3 “Appletizer SP3” was released at 3rd February 2025. The complete development hi… --- ## [PTB 3.0.20.1: licensing info?](https://psychtoolbox.discourse.group/t/ptb-3-0-20-1-licensing-info/5619)
**Author:** [@mjwenger](https://psychtoolbox.discourse.group/u/mjwenger)\ **Replies:** 4\ **Last updated:** [January 30, 2025, 10:20pm UTC](https://psychtoolbox.discourse.group/t/ptb-3-0-20-1-licensing-info/5619 "2025-01-30T22:20:01Z")
Mario – I’ve just finished some initial tests of 3.0.20.1 and was pleased with the results. And many thanks to all who made this one possible. Do you have a sense for when licensing info and costs will be available? -Mi… --- ## [Unable to install on Apple Silicon Macs through Matlab Add-on](https://psychtoolbox.discourse.group/t/unable-to-install-on-apple-silicon-macs-through-matlab-add-on/5592)
**Author:** [@Suubaozi](https://psychtoolbox.discourse.group/u/Suubaozi)\ **Replies:** 16\ **Last updated:** [January 28, 2025, 9:09pm UTC](https://psychtoolbox.discourse.group/t/unable-to-install-on-apple-silicon-macs-through-matlab-add-on/5592 "2025-01-28T21:09:41Z")
It’s my first time to download PTB. I’m using Apple M2 (Sonoma 14.0) and Matlab2024b (Silicon/ARM version). I installed Gstreamer 1.24.10 runtime installer. After watching Celia’s video, I downloaded and installed PTB… --- ## [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… --- ## [Alternative to NVIDIA 3D vision?](https://psychtoolbox.discourse.group/t/alternative-to-nvidia-3d-vision/4530)
**Author:** [@ZestyOlive](https://psychtoolbox.discourse.group/u/ZestyOlive)\ **Replies:** 8\ **Last updated:** [January 24, 2025, 2:03pm UTC](https://psychtoolbox.discourse.group/t/alternative-to-nvidia-3d-vision/4530 "2025-01-24T14:03:36Z")
Hi! Until recently we were using the NVIDIA 3D vision system for binocular rivalry (using Psychtoolbox-3 - NVision3D ). However, our glasses have broken and NVIDIA has stopped manufacturing the system, so I was wonderi… --- ## [Warning and Screen error](https://psychtoolbox.discourse.group/t/warning-and-screen-error/5623)
**Author:** [@blob](https://psychtoolbox.discourse.group/u/blob)\ **Replies:** 2\ **Last updated:** [January 21, 2025, 5:34pm UTC](https://psychtoolbox.discourse.group/t/warning-and-screen-error/5623 "2025-01-21T17:34:17Z")
So here is my error message! maybe someone has encountred it! (for the record, I am trying to run this line: \[win1,winRect\] = Screen(‘OpenOffscreenWindow’,-1,\[128 128 128\]); %-1 ) PTB-WARNING: Mismatch between measured… [Previous page](https://psychtoolbox.discourse.group/latest.md?page=1) [Next page](https://psychtoolbox.discourse.group/latest.md?page=3)