RE: Controlling Trial Duration

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Controlling Trial Duration

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ChrisS	ChrisS posted 11 Years Ago HOT Topic Details Share Topic
Group: Forum Members Posts: 9, Visits: 27	Hi everyone, My paradigm requires participant respond to particular visual targets in a block of trials. When they correctly buttonpress in response to the presentation of the target, a short 500ms sound will be played as feedback for correct response. I want the trials to run its duration (1500ms) when participants button press in response to a stimuli. However with the script I have so far..... as soon as the participant button presses in response to a stimuli, the stimuli disappears for the remainder of trial duration and is then followed by the short feedback sound. I need the visual stimuli to stay on the screen for 1500ms when participant button presses. Does anyone know how to write a trial script for this? Here is what I have so far. Thank you for taking the time to help me with this! ****************************************************************************** TRIALS **************************************************************************** <trial green> / trialduration = 1500 / stimulustimes = [0= green; 0 = greenmarker] / validresponse = (" ",noresponse,"p") / correctresponse = (" ") / responsetrial = (" ",correctfeedback1) / responsetrial = (noresponse,incorrectfeedback1) / responsetrial = ("p",pausetrial) </trial> <trial red> / trialduration = 1500 / stimulustimes = [0= red; 0 = redmarker] / validresponse = (" ",noresponse,"p") / correctresponse = (noresponse) / responsetrial = (noresponse,correctfeedback2) / responsetrial = (" ",incorrectfeedback2) / responsetrial = ("p",pausetrial) </trial> <trial pausetrial> / stimulusframes = [1 = pausetext; 1 = pausemarker] / validresponse = ("p") </trial> <text pausetext> / items = ("Have a break!") / position = (50%, 50%) / valign = center / fontstyle = ("Arial", 6.00%, false, false, false, false, 5, 1) / txcolor = (255, 255, 255) / txbgcolor = (0,0,0) </text> <trial correctfeedback1> / stimulustimes = [0 = correctpicture; 0 = correctsound; 0 = correctfeedbackmarker1] / timeout = 500 / validresponse = (noresponse) </trial> <trial incorrectfeedback1> / stimulustimes = [0 = incorrectpicture; 0 = incorrectfeedbackmaker1] / timeout = 500 / validresponse = (noresponse) </trial> <trial correctfeedback2> / stimulustimes = [0 = correctpicture; 0 = correctfeedbackmarker2] / timeout = 500 / validresponse = (noresponse) </trial> <trial incorrectfeedback2> / stimulustimes = [0 = incorrectpicture; 0 = incorrectfeedbackmarker2] / timeout = 500 / validresponse = (noresponse) </trial> <text break> / items = break / position = (50%, 50%) / valign = center / fontstyle = ("Arial", 6.00%, false, false, false, false, 5, 1) / txcolor = (255, 255, 255) / txbgcolor = (0,0,0) </text> <item break> / 1 = "Have a break!" </item> <trial break> / stimulustimes = [0 = break; 0 = breakmarker] / validresponse = ("p") </trial> **************************************************************************** BLOCKS **************************************************************************** <block one> / trials = [1-20=noreplace(green,green,green,green,green,green,green,green,green,green,red,red,red,red,red,red,red,red,red,red)] </block> <block two> / trials = [1=break;2-21=noreplace(green,green,green,green,green,green,green,green,green,green,red,red,red,red,red,red,red,red,red,red)] </block> <block three> / trials = [1=break;2-21=noreplace(green,green,green,green,green,green,green,green,green,green,red,red,red,red,red,red,red,red,red,red)] </block> <block four> / trials = [1=break;2-21=noreplace(green,green,green,green,green,green,green,green,green,green,red,red,red,red,red,red,red,red,red,red)] </block> <expt> / blocks = [1=one; 2=two; 3=three; 4=four] </expt> ******************************************************************************* <defaults> / screencolor = (0, 0, 0) </defaults>
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Dave	Dave posted 11 Years Ago ANSWER Post Details Share Post
Group: Administrators Posts: 13K, Visits: 109K	You'll want to set the respective stimululs elements' /erase attributes to false if you want them to remain visible. You may also want to adjust the <trial>s' /responseinterrupt behavior according to your preferences.
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ChrisS	ChrisS posted 11 Years Ago ANSWER Post Details Share Post
Group: Forum Members Posts: 9, Visits: 27	Hi Dave, Thanks for that! I just modified my <picture> /erase attribute to false and it worked :) the stimuli stayed on the screen even when a response is made. But I'm not exactly sure what the /responseinterrupt attribute is supposed to do? Also, I was just wondering if there is anyway for me to write up a script command to send port codes to the EEG NeuroScan software when a participant button presses? I want to do this because I want to analyse EEG activity that occurs as a participant makes a response. So if a port code could show up on NeuroScan to indicate that the participant pressed the button, I would be able to analyse this EEG activity. Any suggestions? Thanks for all of your help! You've been incredibly helpful! Regards, Chris
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Dave	Dave posted 11 Years Ago ANSWER Post Details Share Post
Group: Administrators Posts: 13K, Visits: 109K	/responseinterrupt determines how a <trial> should behave once a response is registered. E.g. should it terminate immediately (that's the default)? Should first display any remaining stimuli in /stimulustimes or -frames etc.? As for sending response-locked TTL signals (to an EEG or other external device), you'll want to set up <port> elements as needed and use /reponsemessage or the like to "display" them. See e.g. http://www.millisecond.com/forums/Topic1721.aspx
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ChrisS	ChrisS posted 11 Years Ago ANSWER Post Details Share Post
Group: Forum Members Posts: 9, Visits: 27	Hi Dave, I tried your suggestions regarding using the /responsemesssage attribute in the trial and adding an additional port code which I called pressmarker (see TRIAL section and MARKERS section below) but it didn't seem to work. Any ideas why? **************************************************************************** STIMULI ************************************************************************** <picture green> / items = green / size = (75%, 75%) / valign = center / position = (50%, 50%) / erase = false </picture> <item green> / 1 = "green.jpg" </item> <picture red> / items = red / size = (75%, 75%) / valign = center / position = (50%, 50%) / erase = false </picture> <item red> / 1 = "red.jpg" </item> <picture fixcross> / items = fixcross / size = (50%,50%) / valign = center / position = (50%,50%) </picture> <item fixcross> / 1 = "fixcross.png" </item> <sound correctsound> /items = correctsound </sound> <item correctsound> / 1 = "trainwhistle.wav" </item> <picture correctpicture> / items = correctpicture / size = (100%, 100%) / valign = center / position = (50%, 50%) </picture> <item correctpicture> / 1 = "blacksq.png" </item> <picture incorrectpicture> / items = incorrectpicture / size = (100%, 100%) / valign = center / position = (50%, 50%) </picture> <item incorrectpicture> / 1 = "blacksq.png" </item> **************************************************************************** MARKERS **************************************************************************** <port greenmarker> / port = lpt1 / subport = data / items = ("00000001") </port> <port redmarker> / port = lpt1 / subport = data / items = ("00000100") </port> <port correctfeedbackmarker1> / port = lpt1 / subport = data / items = ("00000010") </port> <port incorrectfeedbackmarker1> / port = lpt1 / subport = data / items = ("00000011") </port> <port correctfeedbackmarker2> / port = lpt1 / subport = data / items = ("00000101") </port> <port incorrectfeedbackmarker2> / port = lpt1 / subport = data / items = ("00000110") </port> <port breakmarker> / port = lpt1 / subport = data / items = ("00000111") </port> <port pausemarker> / port = lpt1 / subport = data / items = ("00001000") </port> <port pressmarker> / port = lpt1 / subport = data / items = ("00001001") / erase = true ("00000000") </port> **************************************************************************** TRIALS **************************************************************************** <trial green1> / trialduration = 1500 / stimulustimes = [0= green; 0= greenmarker] / validresponse = (" ",noresponse,"p") / correctresponse = (" ") / responsemessage = (" ", pressmarker, 100) / responsetrial = (" ",correctfeedback1) / responsetrial = (noresponse,incorrectfeedback1) / responsetrial = ("p",pausetrial) </trial> <trial green2> / trialduration = 1500 / stimulustimes = [0= green; 0= greenmarker] / validresponse = (" ",noresponse,"p") / correctresponse = (noresponse) / responsemessage = (" ", pressmarker, 100) / responsetrial = (noresponse,correctfeedback2) / responsetrial = (" ",incorrectfeedback2) / responsetrial = ("p",pausetrial) </trial> <trial red1> / trialduration = 1500 / stimulustimes = [0= red; 0= redmarker] / validresponse = (" ",noresponse,"p") / correctresponse = (noresponse) / responsemessage = (" ", pressmarker, 100) / responsetrial = (noresponse,correctfeedback2) / responsetrial = (" ",incorrectfeedback2) / responsetrial = ("p",pausetrial) </trial> <trial red2> / trialduration = 1500 / stimulustimes = [0= red; 0= redmarker] / validresponse = (" ",noresponse,"p") / correctresponse = (" ") / responsemessage = (" ", pressmarker, 100) / responsetrial = (" ",correctfeedback1) / responsetrial = (noresponse,incorrectfeedback1) / responsetrial = ("p",pausetrial) </trial> <trial pausetrial> / stimulusframes = [1 = break; 1 = pausemarker] / validresponse = ("p") </trial> <picture break> / items = break / size = (100%, 100%) / valign = center / position = (50%, 50%) </picture> <item break> / 1 = "break.jpg" </item> <trial correctfeedback1> / stimulustimes = [0 = correctpicture; 0 = correctsound; 0 = correctfeedbackmarker1] / trialduration = 500 / validresponse = (noresponse) </trial> <trial incorrectfeedback1> / stimulustimes = [0 = incorrectpicture; 0 = incorrectfeedbackmarker1] / trialduration = 500 / validresponse = (noresponse) </trial> <trial correctfeedback2> / stimulustimes = [0 = correctpicture; 0 = correctfeedbackmarker2] / trialduration = 500 / validresponse = (noresponse) </trial> <trial incorrectfeedback2> / stimulustimes = [0 = incorrectpicture; 0 = incorrectfeedbackmarker2] / trialduration = 500 / validresponse = (noresponse) </trial> <trial break> / stimulustimes = [0 = break; 0 = breakmarker] / validresponse = ("p") </trial> **************************************************************************** BLOCKS **************************************************************************** <block one> / trials = [1-50=noreplace(green2,red2)] </block> <block two> / trials = [1=break;2-51=noreplace(green2,red2)] </block> <block three> / trials = [1=break;2-51=noreplace(green1,red1)] </block> <block four> / trials = [1=break;2-51=noreplace(green1,red1)] </block> <expt> / blocks = [1=one; 2=two; 3=three; 4=four] </expt> ******************************************************************************* <defaults> / screencolor = (0, 0, 0) </defaults>
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Dave	Dave posted 11 Years Ago ANSWER Post Details Share Post
Group: Administrators Posts: 13K, Visits: 109K	What exactly does "it didn't seem to work" mean? Please be as specific as possible. What is or is not happening exactly?
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ChrisS	ChrisS posted 11 Years Ago ANSWER Post Details Share Post
Group: Forum Members Posts: 9, Visits: 27	Hi Dave, Sorry. I meant the response port code "00001001" which should come out as "9" in the EEG NeuroScan software, did not appear when a button is pressed. <port pressmarker> / port = lpt1 / subport = data / items = ("00001001") / erase = true ("00000000") </port> Chris
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Dave	Dave posted 11 Years Ago ANSWER Post Details Share Post
Group: Administrators Posts: 13K, Visits: 109K	Start small. Set up a simple test script that simply does: <block myblock> / trials = [1-10=mytrial] </block> <trial mytrial> / validresponse = (" ") / responsemessage = (" ", pressmarker, 100) </trial> and check if the device registers the signal. The one complication you'll have to deal with in your full script is that any other markers presented via /stimulustimes will remain raised for the duration of the trial and will be erased at the end. That may interfere in multiple ways with the marker sent via /responsemessage. You'll want to toy around with something along the lines of <port greenmarker> / port = lpt1 / subport = data / items = ("00000001") / erase = false </port> <port allbitstozero> / port = lpt1 / subport = data / items = ("00000000") / erase = false </port> <trial green1> ... / stimulustimes = [0=green,greenmarker; 50=allbitstozero] / beginresponsetime = 0 ... </trial> to avoid that.
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ChrisS	ChrisS posted 11 Years Ago ANSWER Post Details Share Post
Group: Forum Members Posts: 9, Visits: 27	Thanks Dave I'll give that a go! Much appreciated! :) Chris
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ChrisS	ChrisS posted 11 Years Ago ANSWER Post Details Share Post
Group: Forum Members Posts: 9, Visits: 27	IT WORKED!!! AWESOME!!! :) THANKS HEAPS DAVE! Chris
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