From dhair at wfubmc.edu Mon May 3 13:42:57 2004 From: dhair at wfubmc.edu (David Hairston) Date: Mon, 3 May 2004 09:42:57 -0400 Subject: Losing sound during paradigm Message-ID: FYI folks, just for the record, this was a hardware-related sound card issue. Apparently, for playing very fast, very short sound clips, many cards will either give an artifact or clip the sound - doing some research, found that many functionally have a 8-10 ms minimum. We ended up using a new Sound Blaster Audigy 2 card, it works flawlessly w/ great re-production and virtually zero delay. W. David Hairston Neurobiology and Anatomy Wake Forest University School of Medicine Winston-Salem, NC 27157 (336) 716-4481 (lab) -----Original Message----- From: eprime at mail.talkbank.org [mailto:eprime at mail.talkbank.org] On Behalf Of David Hairston Sent: Tuesday, April 20, 2004 10:54 AM To: eprime at mail.talkbank.org Subject: Losing sound during paradigm I am having an issue with "losing" my sound after ~25 trials in my paradigm, no clue why. I am presenting very short (AKA 10 ms) sound clips 2 times w/ only ~33-66 ms between (2 screen refreshes...). Anyhow, this problem dosn't occur on all machines (thus far, ONLY on the experimental PC, Ugh!), and, as mentioned, it will run the first several trials fine, then the sound just stops, no complaints... when it finishes running, I have sound in Windows (XP) as usual. I am thinking it must be overfilling some buffer, but have no idea how to check/remedy this situation? Oh, and all the sounds are pre-relesead by 100 ms, and are only 8.bits per sample @22kHz, single channel. Any suggestions as to what is going on? From nc2 at ualberta.ca Fri May 7 17:38:05 2004 From: nc2 at ualberta.ca (Nick Coupland) Date: Fri, 7 May 2004 11:38:05 -0600 Subject: n-back Message-ID: Hi, I'm trying to get up a two back task with a randomized letter list, which takes from one of two trial lists :- no match TwoNoMTrialList match TwoMTrialList The no match procedure has an inline script to modify the letter if it is an accidental match to the two back letter: 'Add contents of TwoList to the "context" in which we are working. c.Add TwoList c.Update 'Declare a variable, i, for use as a counter in a while-loop Dim i As Integer i = 0 'Make sure that the letter to be presented is not accidentally a 'two-back match. If it is, select a different letter to present. While c.GetAttrib("Letters") = TwoLettersBack c.SetAttrib "Letters", TwoNoMTrialList.GetAttrib(i, "Letters") i = i + 1 Wend 'Set TwoLettersBack to what was previously OneLetterBack. 'Set OneLetterBack to the current letter. TwoLettersBack = OneLetterBack OneLetterBack = TwoNoMTrialList.GetCurrentAttrib("Letters") However, this only works when the two back letter is from a no match trial. If it is from a match trial, it crashes. How do I modify the script so it can recognize accidental matches from both match and no match trials? -------------- next part -------------- An HTML attachment was scrubbed... URL: From Nolan at NKI.RFMH.ORG Fri May 7 17:50:15 2004 From: Nolan at NKI.RFMH.ORG (Nolan, Karen) Date: Fri, 7 May 2004 13:50:15 -0400 Subject: n-back Message-ID: Hi Nick - The nback program I'm running uses the following 'Make sure that the letter to be presented is not accidentally a 'two-back match. If it is, select a different letter to present. IF c.GetAttrib("Stimnum") = TwoLettersBack then if val(c.GetAttrib("Stimnum"))<4 then c.SetAttrib "Stimnum", (val(c.GetAttrib("Stimnum"))+1) else c.SetAttrib "Stimnum", (val(c.GetAttrib("Stimnum"))-1) end if else 'Set TwoLettersBack to what was previously OneLetterBack. 'Set OneLetterBack to the current letter. TwoLettersBack = OneLetterBack OneLetterBack = c.GetAttrib("Stimnum") end if It looks pretty similar to what you're using. The inline in my match procedure looks like this: c.SetAttrib "Stimnum", TwoLettersBack 'Set TwoLettersBack to what was previously OneLetterBack. 'Set OneLetterBack to the current letter. TwoLettersBack = OneLetterBack OneLetterBack = c.GetAttrib("Stimnum") Have you checked your match procedure to be sure that those trials have the same attributes as the no match trials? Karen Nolan -----Original Message----- From: Nick Coupland [mailto:nc2 at ualberta.ca] Sent: Friday, May 07, 2004 1:38 PM To: eprime at mail.talkbank.org Subject: n-back Hi, I'm trying to get up a two back task with a randomized letter list, which takes from one of two trial lists :- no match TwoNoMTrialList match TwoMTrialList The no match procedure has an inline script to modify the letter if it is an accidental match to the two back letter: 'Add contents of TwoList to the "context" in which we are working. c.Add TwoList c.Update 'Declare a variable, i, for use as a counter in a while-loop Dim i As Integer i = 0 'Make sure that the letter to be presented is not accidentally a 'two-back match. If it is, select a different letter to present. While c.GetAttrib("Letters") = TwoLettersBack c.SetAttrib "Letters", TwoNoMTrialList.GetAttrib(i, "Letters") i = i + 1 Wend 'Set TwoLettersBack to what was previously OneLetterBack. 'Set OneLetterBack to the current letter. TwoLettersBack = OneLetterBack OneLetterBack = TwoNoMTrialList.GetCurrentAttrib("Letters") However, this only works when the two back letter is from a no match trial. If it is from a match trial, it crashes. How do I modify the script so it can recognize accidental matches from both match and no match trials? -------------- next part -------------- An HTML attachment was scrubbed... URL: From rlg215 at psu.edu Tue May 18 18:15:53 2004 From: rlg215 at psu.edu (Rebecca Gordon) Date: Tue, 18 May 2004 14:15:53 -0400 Subject: question about change blindness research Message-ID: Hello, For an undergraduate research thesis, my partner and I are planning to complete a study in the realm of change blindness. For this study, we plan on using the flicker paradigm in a change detection task on the computer. Much of the programming in our psychology lab is done on e-prime, therefore we are planning on using e-prime to program our stimuli. Our question is if anyone is or has worked on change detection and has flicker paradigm stimuli programmed that they would be willing to let us borrow for our study. Thank you, Rebecca rlg215 at psu.edu From dhair at wfubmc.edu Mon May 3 13:42:57 2004 From: dhair at wfubmc.edu (David Hairston) Date: Mon, 3 May 2004 09:42:57 -0400 Subject: Losing sound during paradigm Message-ID: FYI folks, just for the record, this was a hardware-related sound card issue. Apparently, for playing very fast, very short sound clips, many cards will either give an artifact or clip the sound - doing some research, found that many functionally have a 8-10 ms minimum. We ended up using a new Sound Blaster Audigy 2 card, it works flawlessly w/ great re-production and virtually zero delay. W. David Hairston Neurobiology and Anatomy Wake Forest University School of Medicine Winston-Salem, NC 27157 (336) 716-4481 (lab) -----Original Message----- From: eprime at mail.talkbank.org [mailto:eprime at mail.talkbank.org] On Behalf Of David Hairston Sent: Tuesday, April 20, 2004 10:54 AM To: eprime at mail.talkbank.org Subject: Losing sound during paradigm I am having an issue with "losing" my sound after ~25 trials in my paradigm, no clue why. I am presenting very short (AKA 10 ms) sound clips 2 times w/ only ~33-66 ms between (2 screen refreshes...). Anyhow, this problem dosn't occur on all machines (thus far, ONLY on the experimental PC, Ugh!), and, as mentioned, it will run the first several trials fine, then the sound just stops, no complaints... when it finishes running, I have sound in Windows (XP) as usual. I am thinking it must be overfilling some buffer, but have no idea how to check/remedy this situation? Oh, and all the sounds are pre-relesead by 100 ms, and are only 8.bits per sample @22kHz, single channel. Any suggestions as to what is going on? From nc2 at ualberta.ca Fri May 7 17:38:05 2004 From: nc2 at ualberta.ca (Nick Coupland) Date: Fri, 7 May 2004 11:38:05 -0600 Subject: n-back Message-ID: Hi, I'm trying to get up a two back task with a randomized letter list, which takes from one of two trial lists :- no match TwoNoMTrialList match TwoMTrialList The no match procedure has an inline script to modify the letter if it is an accidental match to the two back letter: 'Add contents of TwoList to the "context" in which we are working. c.Add TwoList c.Update 'Declare a variable, i, for use as a counter in a while-loop Dim i As Integer i = 0 'Make sure that the letter to be presented is not accidentally a 'two-back match. If it is, select a different letter to present. While c.GetAttrib("Letters") = TwoLettersBack c.SetAttrib "Letters", TwoNoMTrialList.GetAttrib(i, "Letters") i = i + 1 Wend 'Set TwoLettersBack to what was previously OneLetterBack. 'Set OneLetterBack to the current letter. TwoLettersBack = OneLetterBack OneLetterBack = TwoNoMTrialList.GetCurrentAttrib("Letters") However, this only works when the two back letter is from a no match trial. If it is from a match trial, it crashes. How do I modify the script so it can recognize accidental matches from both match and no match trials? -------------- next part -------------- An HTML attachment was scrubbed... URL: From Nolan at NKI.RFMH.ORG Fri May 7 17:50:15 2004 From: Nolan at NKI.RFMH.ORG (Nolan, Karen) Date: Fri, 7 May 2004 13:50:15 -0400 Subject: n-back Message-ID: Hi Nick - The nback program I'm running uses the following 'Make sure that the letter to be presented is not accidentally a 'two-back match. If it is, select a different letter to present. IF c.GetAttrib("Stimnum") = TwoLettersBack then if val(c.GetAttrib("Stimnum"))<4 then c.SetAttrib "Stimnum", (val(c.GetAttrib("Stimnum"))+1) else c.SetAttrib "Stimnum", (val(c.GetAttrib("Stimnum"))-1) end if else 'Set TwoLettersBack to what was previously OneLetterBack. 'Set OneLetterBack to the current letter. TwoLettersBack = OneLetterBack OneLetterBack = c.GetAttrib("Stimnum") end if It looks pretty similar to what you're using. The inline in my match procedure looks like this: c.SetAttrib "Stimnum", TwoLettersBack 'Set TwoLettersBack to what was previously OneLetterBack. 'Set OneLetterBack to the current letter. TwoLettersBack = OneLetterBack OneLetterBack = c.GetAttrib("Stimnum") Have you checked your match procedure to be sure that those trials have the same attributes as the no match trials? Karen Nolan -----Original Message----- From: Nick Coupland [mailto:nc2 at ualberta.ca] Sent: Friday, May 07, 2004 1:38 PM To: eprime at mail.talkbank.org Subject: n-back Hi, I'm trying to get up a two back task with a randomized letter list, which takes from one of two trial lists :- no match TwoNoMTrialList match TwoMTrialList The no match procedure has an inline script to modify the letter if it is an accidental match to the two back letter: 'Add contents of TwoList to the "context" in which we are working. c.Add TwoList c.Update 'Declare a variable, i, for use as a counter in a while-loop Dim i As Integer i = 0 'Make sure that the letter to be presented is not accidentally a 'two-back match. If it is, select a different letter to present. While c.GetAttrib("Letters") = TwoLettersBack c.SetAttrib "Letters", TwoNoMTrialList.GetAttrib(i, "Letters") i = i + 1 Wend 'Set TwoLettersBack to what was previously OneLetterBack. 'Set OneLetterBack to the current letter. TwoLettersBack = OneLetterBack OneLetterBack = TwoNoMTrialList.GetCurrentAttrib("Letters") However, this only works when the two back letter is from a no match trial. If it is from a match trial, it crashes. How do I modify the script so it can recognize accidental matches from both match and no match trials? -------------- next part -------------- An HTML attachment was scrubbed... URL: From rlg215 at psu.edu Tue May 18 18:15:53 2004 From: rlg215 at psu.edu (Rebecca Gordon) Date: Tue, 18 May 2004 14:15:53 -0400 Subject: question about change blindness research Message-ID: Hello, For an undergraduate research thesis, my partner and I are planning to complete a study in the realm of change blindness. For this study, we plan on using the flicker paradigm in a change detection task on the computer. Much of the programming in our psychology lab is done on e-prime, therefore we are planning on using e-prime to program our stimuli. Our question is if anyone is or has worked on change detection and has flicker paradigm stimuli programmed that they would be willing to let us borrow for our study. Thank you, Rebecca rlg215 at psu.edu