hi! we use macBook pro mid 2015 CATALINA
we have been facing a bunch errors in our paradigm since we updated the psychtoolBox to the latest release and matlab from 2015 to 2020B. The experiments were running ok until wednesday this week. Thanks to Mario I was able to pass an error on the message and now PTB is claiming for an error in Synchronization. Before i proceed and make things worst for my experiment i want to consult if you think i should downgrade the version of PsychtoolBox to the release on 2015. ( i do not know if that version still being served so please i apologise if i am asking a basic question) otherwise. or if you think my late 2015 macbook pro running on Catalina Intel Iris Pro 1536 MB graphics may be corrected for the synchronization by adding , deleting or modifying some lines of code in my program. ( if you think so please direct me to step by step instructions as to correct the vbl retrace? I have been searching for a long time with no success. it is of course totally my fault because i am totally blind and my digital search skills are very poor. I do apologise for that. i will improve! the error is pasted below this line.
PTB-INFO: Using modified PortAudio V19.6.0-devel, revision unknown
Initialize Eyelink Connection and Data file
Eyelink: Opening Eyelink in DUMMY mode
Initialize Display Screen
PTB-INFO: Retina display. Enabling panel fitter for scaled Retina compatibility mode.
PTB-INFO: This is Psychtoolbox-3 for Apple OS X, under Matlab 64-Bit (Version 3.0.17 - Build date: Dec 17 2020).
PTB-INFO: OS support status: OSX 10.15 minimally supported and tested.
PTB-INFO: Type ‘PsychtoolboxVersion’ for more detailed version information.
PTB-INFO: Most parts of the Psychtoolbox distribution are licensed to you under terms of the MIT License, with
PTB-INFO: some restrictions. See file ‘License.txt’ in the Psychtoolbox root folder for the exact licensing conditions.
PTB-INFO: For information about paid priority support, community membership and commercial services, please type
PTB-INFO: OpenGL-Renderer is Intel Inc. :: Intel Iris Pro OpenGL Engine :: 2.1 INTEL-14.7.8
PTB-INFO: Renderer has 1536 MB of VRAM and a maximum 1536 MB of texture memory.
PTB-INFO: VBL startline = 1800 , VBL Endline = -1
PTB-INFO: Beamposition queries unsupported or defective on this system. Using basic timestamping as fallback.
PTB-INFO: Timestamps returned by Screen(‘Flip’) will be therefore less robust and accurate.
PTB-INFO: Measured monitor refresh interval from VBLsync = 16.671358 ms [59.983115 Hz]. (299 valid samples taken, stddev=0.712793 ms.)
PTB-INFO: Small deviations between reported values are normal and no reason to worry.
WARNING: Couldn’t compute a reliable estimate of monitor refresh interval! Trouble with VBL syncing?!?
----- ! PTB - ERROR: SYNCHRONIZATION FAILURE ! -----
One or more internal checks (see Warnings above) indicate that synchronization
of Psychtoolbox to the vertical retrace (VBL) is not working on your setup.
This will seriously impair proper stimulus presentation and stimulus presentation timing!
Please read ‘help SyncTrouble’ for information about how to solve or work-around the problem.
You can force Psychtoolbox to continue, despite the severe problems, by adding the command
Screen(‘Preference’, ‘SkipSyncTests’, 1); at the top of your script, if you really know what you are doing.
Error using BlackHole (line 167)
See error message printed above.
Last Error: Error using BlackHole (line 167)
See error message printed above. ()