Web Participant Log Questions

Back

Web Participant Log Questions

Author	Message
jbfleming	jbfleming posted 10 Years Ago ANSWER Post Details Share Post
Group: Forum Members Posts: 46, Visits: 75	The participant log does appear to have much more accurate counts now. Thank you!
	Reply Like 46
seandr	seandr posted 10 Years Ago ANSWER Post Details Share Post
Group: Administrators Posts: 1.3K, Visits: 5.6K	FYI - I uploaded a fix to the activity reports on Friday that fixes the incorrect count for participants who have completed the test. The numbers should be correct now. Thanks, Sean
	Reply Like 46
jbfleming	jbfleming posted 10 Years Ago ANSWER Post Details Share Post
Group: Forum Members Posts: 46, Visits: 75	Okay, yeah, my understanding was if I used milliseconds it would get rounded to something that worked on that system, and it sounds like that is indeed the case, but that two frames can get rounded to the same, causing the problem. I think considering that this has only popped up once, I am not going to worry about it. Thanks!
	Reply Like 51
Dave	Dave posted 10 Years Ago ANSWER Post Details Share Post
Group: Administrators Posts: 13K, Visits: 104K	Yes, but wasn't referring to your response (hadn't even seen it yet) :-)
	Reply Like 40
seandr	seandr posted 10 Years Ago ANSWER Post Details Share Post
Group: Administrators Posts: 1.3K, Visits: 5.6K	Yes, looks like we cross posted.
	Reply Like 57
Dave	Dave posted 10 Years Ago ANSWER Post Details Share Post
Group: Administrators Posts: 13K, Visits: 104K	This is exactly what I laid out in my previous response: / stimulustimes = [0=ec_positive_gay_mask; 500=noreplace(ec_positive_gay_stimulus_gay); 517=noreplace(ec_positive_gay_stimulus_positive); 534=noreplace(ec_positive_gay_test_consonant_strings)] You need a minimum of 60Hz to achieve those timings (frame duration ~16.77ms). Won't work at 50Hz or below.
	Reply Like 63
Admin	Admin posted 10 Years Ago ANSWER Post Details Share Post
Group: Administrators Posts: 2, Visits: 13	The reason this might show up sporadically is that it depends on the vertical refresh rate of the participant's monitor. With displays running at frequencies (other than 60 Hz) two of the stimulus times might be rounded to the same vertical retrace frame, which would produce this message. Should be relatively uncommon given that most monitors are running at 60 Hz or fairly close to it. -Sean
	Reply Like 54
Dave	Dave posted 10 Years Ago ANSWER Post Details Share Post
Group: Administrators Posts: 13K, Visits: 104K	He might be running a system with an odd, extremely slow refresh rate. Consider this: / stimulustimes = [0=somestim; 10=someotherstim] The above will work on a display running at 100Hz refresh rate. Try it on a system running at 50Hz, and you'll get an error. 10ms aren't achievable (frame duration is 20ms), thus the same frame effectively gets redefined (this is what the error message points to: for event 22 in the frame sequence).
	Reply Like 64
jbfleming	jbfleming posted 10 Years Ago ANSWER Post Details Share Post
Group: Forum Members Posts: 46, Visits: 75	Here's the block in question: <trial ec_positive_gay_trials_consonants> / pretrialpause = 300 / validresponse = ("f", "j") / correctresponse = ("j") / stimulustimes = [0=ec_positive_gay_mask; 500=noreplace(ec_positive_gay_stimulus_gay); 517=noreplace(ec_positive_gay_stimulus_positive); 534=noreplace(ec_positive_gay_test_consonant_strings)] </trial>
	Reply Like 61
jbfleming	jbfleming posted 10 Years Ago ANSWER Post Details Share Post
Group: Forum Members Posts: 46, Visits: 75	The file has remained unchanged and hasn't caused this error for anyone else. I will check it, but why would this error only happen for one participant?
	Reply Like 70