hi,
when i run the attached code 'DebugRunTrial.m' (which will load
data from 'debugImages.mat'), i found that presentation of a
window (with some images and texts) increments in units of 2 frames rather
than 1 despite the actual intend is to decrease by just one frame. one
test run of the trial would give results like:
my framerate is 75Hz, which gives 13.33333ms per refresh. the
'Actual SOA' is the actual amount of time this window is on, and you can
see it changes in 2 frames rather than 1.
4 146.6667 159.9722
5 133.3333 159.9889
...
8 120 133.3493
...
11 106.6667 133.3478
...
15 93.3333 106.6969
...
18 80 106.7759
...
21 66.6667 80.1527
...
25 53.3333 80.1057
...
28 40 53.4412
...
31 26.6667 53.4849
my ScreenTest report is also attached if this is some useful info.
i'd appreciate it if someone can help me find a way to increment/decrease
window presentation time 1 frame at a time since i have to use a staircase
to control this in the actual experiment.
thank you!
when i run the attached code 'DebugRunTrial.m' (which will load
data from 'debugImages.mat'), i found that presentation of a
window (with some images and texts) increments in units of 2 frames rather
than 1 despite the actual intend is to decrease by just one frame. one
test run of the trial would give results like:
my framerate is 75Hz, which gives 13.33333ms per refresh. the
'Actual SOA' is the actual amount of time this window is on, and you can
see it changes in 2 frames rather than 1.
>>DebugRunTrialTrial Number Theoretical SOA Actual SOA
4 146.6667 159.9722
5 133.3333 159.9889
...
8 120 133.3493
...
11 106.6667 133.3478
...
15 93.3333 106.6969
...
18 80 106.7759
...
21 66.6667 80.1527
...
25 53.3333 80.1057
...
28 40 53.4412
...
31 26.6667 53.4849
my ScreenTest report is also attached if this is some useful info.
i'd appreciate it if someone can help me find a way to increment/decrease
window presentation time 1 frame at a time since i have to use a staircase
to control this in the actual experiment.
thank you!