different timing btw event codes and beh variable

Hi Jaewon,

I have a quick question. This is my input:

trial_start=run_scene(scene0,25);
bhv_variable('START', trial_start);

I obtain a bhv_variable that is 0.2 msec earlier than the event code 25. Why is that? is it because the event code encodes the timing the scene is drawn while the behavioral variable encodes the exact start?

Silvia

I don't understand what you mean by "the exact start".

They both indicate the same event, screen flipping, but the timestamp of the eventmarker is acquired when the Strobe Bit actually goes HIGH, which is 125 us after, by default. That delay is necessary to allow some time for digital output lines of Behavioral Codes to be stabilized.
https://monkeylogic.nimh.nih.gov/docs_MainMenu.html#Strobe