Psychtoolbox-3 for Microsoft Windows, under Matlab 64-Bit (Version 3.0.19 - Build date: Oct 25 2023)
I am having a synchronization issue. I am very new to MATLAB so I would really appreciate the help.
Here is what I got:
PTB-ERROR: The most likely cause would be that Synchronization of stimulus onset (buffer swap) to the
PTB-ERROR: vertical blank interval VBL is not working properly, or swap completion signalling to PTB is broken.
PTB-ERROR: Please run the script PerceptualVBLSyncTest to check this.
So I ran the above script and this is what I got:
PTB-WARNING: Call to PsychAvSetMmMaxThreadCharacteristics() for Vista-MMCSS scheduling failed for threadhandle 00007FFA4ACD5900. Setting thread priority to HIGHEST as a work-around…
PTB-INFO: The detected endline of the vertical blank interval is equal or lower than the startline. This indicates
PTB-INFO: that i couldn’t detect the duration of the vertical blank interval and won’t be able to correct timestamps
PTB-INFO: for it. This will introduce a very small and constant offset (typically << 1 msec). Read ‘help BeampositionQueries’
PTB-INFO: for how to correct this, should you really require that last few microseconds of precision.
PTB-INFO: Btw. this can also mean that your systems beamposition queries are slightly broken. It may help timing precision to
PTB-INFO: enable the beamposition workaround, as explained in ‘help ConserveVRAMSettings’, section ‘kPsychUseBeampositionQueryWorkaround’.
PTB-WARNING: Call to PsychAvSetMmMaxThreadCharacteristics() for Vista-MMCSS scheduling failed for threadhandle 00007FFA4ACD5900. Setting thread priority to HIGHEST as a work-around…
PTB-INFO: OpenGL-Renderer is Intel :: Intel(R) Iris(R) Xe Graphics :: 4.6.0 - Build 31.0.101.4502
PTB-INFO: VBL startline = 1080 , VBL Endline = 1079
PTB-INFO: Measured monitor refresh interval from beamposition = 16.670078 ms [59.987723 Hz].
PTB-INFO: Will use beamposition query for accurate Flip time stamping.
PTB-INFO: Measured monitor refresh interval from VBLsync = 16.670866 ms [59.984886 Hz]. (50 valid samples taken, stddev=0.036185 ms.)
PTB-INFO: Reported monitor refresh interval from operating system = 16.666667 ms [60.000000 Hz].
PTB-INFO: Small deviations between reported values are normal and no reason to worry.
PTB-INFO: ==============================================================================================================================
PTB-INFO: WINDOWS DWM DESKTOP COMPOSITOR IS ACTIVE. On this Windows-10 or later system, Psychtoolbox can no longer reliably detect if
PTB-INFO: this will cause trouble for timing and integrity of visual stimuli or not. You might be just fine, or you could be in trouble.
PTB-INFO: Use external measurement equipment and independent procedures to verify reliability of timing if you care about proper timing.
PTB-INFO: ==============================================================================================================================
Does this mean that it just wont be accurate in terms of hundredths/thousandths of a msec? Like if I only cared for the whole number of msec, could I ignore this message?