added latencies are shorter than total timeout


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buschmarie
buschmarie
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Dear millisecond team,

I have created a program with inquisit lab 5. The subjects received a video as a stimulus and were asked to press a button to indicate what sensations they had. I use the latency times to calculate how long they felt relaxed for example.
The video timeout was 1191000ms long in total. If I add up all the latencies of a subject, I get different values. These values are slightly shorter than the total timeout. Here are the added latencies: 1190119, 1190547, 1190959, 1190860 etc.

Can you tell me how these different times arise so that I can explain this fact in my study?

Many thanks in advance.
Kind regards, Annemarie Busch

PS.: Here are excerpts from the program so you can understand more easy what I did

<video asmr_target>
/items = ("ASMR.mp4")
/playthrough = false
/position = (50, 50)
/size = (85%, 85%)
/erase = false
</video>
______________________________________________________________________
<text reminder_basline_left>
/items = ("A: keine besondere Empfindung")
/position = (10, 98)
/txcolor = (0, 0, 0)
/font = ("Calibri", -20, 700, 0, 49)
</text>

<text reminder_relaxation_middle>
/items = ("G: Entspannung")
/position = (50, 98)
/txcolor = (0, 0, 0)
/font = ("Calibri", -20, 700, 0, 49)
</text>

<text reminder_tingling_right>
/items = ("L: Tingles")
/position = (90, 98)
/txcolor = (0, 0, 0)
/font = ("Calibri", -20, 700, 0, 49)
</text>

<text current_time>
/ items= ("Zeit = <% script.currenttime %>")
/position = (4, 1)
/txcolor = (0, 0, 0)
/font = ("Calibri", -20, 700, 0, 49)
</text>

<text error>
/items = ("falsche Taste")
/select = noreplace
/position = (50, 3)
/txcolor = (200, 0, 0)
/fontstyle = ("Calibri", 2.50%, true, false, false, false, 5, 1)
</text>
______________________________________________________________________________
<trial asmr_target_measure>
/inputdevice = keyboard
/validresponse = (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65)
/correctresponse = (30, 34, 38)
/errormessage = true(error, 400)
/branch = [trial.asmr_target_measure]
</trial>
____________________________________________________________________________
<block preinstruction>
/preinstructions = (welcome, how_to1, how_to2, how_to3, instruction1, instruction2)
</block>

<block target>
/trials = [1=asmr_target_measure]
/bgstim = (asmr_target, reminder_basline_left, reminder_relaxation_middle, reminder_tingling_right, current_time)
/timeout = 1191000
</block>

<block postinstruction>
/postinstructions = (expt_end)
</block>

<expt>
/blocks = [1=preinstruction; 2=target; 3=postinstruction]
</expt>
_______________________________________________________________________________
<defaults>
/screencolor = (0, 0, 0)
/txcolor = (whitesmoke)
</defaults>
__________________________________________________________
<instruct>
/txcolor = (255, 255, 255)
/screencolor = (0, 0, 0)
/fontstyle = ("Calibri", 3.00%, false, false, false, false, 5, 1)
/nextkey = (" ")
/prevkey = ("p")
/nextlabel = "(Leertaste) nächste Seite..."
/prevlabel = "(p) vorherige Seite..."
</instruct>

<page welcome>
Dave
Dave
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buschmarie - 8/17/2022
Dear millisecond team,

I have created a program with inquisit lab 5. The subjects received a video as a stimulus and were asked to press a button to indicate what sensations they had. I use the latency times to calculate how long they felt relaxed for example.
The video timeout was 1191000ms long in total. If I add up all the latencies of a subject, I get different values. These values are slightly shorter than the total timeout. Here are the added latencies: 1190119, 1190547, 1190959, 1190860 etc.

Can you tell me how these different times arise so that I can explain this fact in my study?

Many thanks in advance.
Kind regards, Annemarie Busch

PS.: Here are excerpts from the program so you can understand more easy what I did

<video asmr_target>
/items = ("ASMR.mp4")
/playthrough = false
/position = (50, 50)
/size = (85%, 85%)
/erase = false
</video>
______________________________________________________________________
<text reminder_basline_left>
/items = ("A: keine besondere Empfindung")
/position = (10, 98)
/txcolor = (0, 0, 0)
/font = ("Calibri", -20, 700, 0, 49)
</text>

<text reminder_relaxation_middle>
/items = ("G: Entspannung")
/position = (50, 98)
/txcolor = (0, 0, 0)
/font = ("Calibri", -20, 700, 0, 49)
</text>

<text reminder_tingling_right>
/items = ("L: Tingles")
/position = (90, 98)
/txcolor = (0, 0, 0)
/font = ("Calibri", -20, 700, 0, 49)
</text>

<text current_time>
/ items= ("Zeit = <% script.currenttime %>")
/position = (4, 1)
/txcolor = (0, 0, 0)
/font = ("Calibri", -20, 700, 0, 49)
</text>

<text error>
/items = ("falsche Taste")
/select = noreplace
/position = (50, 3)
/txcolor = (200, 0, 0)
/fontstyle = ("Calibri", 2.50%, true, false, false, false, 5, 1)
</text>
______________________________________________________________________________
<trial asmr_target_measure>
/inputdevice = keyboard
/validresponse = (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65)
/correctresponse = (30, 34, 38)
/errormessage = true(error, 400)
/branch = [trial.asmr_target_measure]
</trial>
____________________________________________________________________________
<block preinstruction>
/preinstructions = (welcome, how_to1, how_to2, how_to3, instruction1, instruction2)
</block>

<block target>
/trials = [1=asmr_target_measure]
/bgstim = (asmr_target, reminder_basline_left, reminder_relaxation_middle, reminder_tingling_right, current_time)
/timeout = 1191000
</block>

<block postinstruction>
/postinstructions = (expt_end)
</block>

<expt>
/blocks = [1=preinstruction; 2=target; 3=postinstruction]
</expt>
_______________________________________________________________________________
<defaults>
/screencolor = (0, 0, 0)
/txcolor = (whitesmoke)
</defaults>
__________________________________________________________
<instruct>
/txcolor = (255, 255, 255)
/screencolor = (0, 0, 0)
/fontstyle = ("Calibri", 3.00%, false, false, false, false, 5, 1)
/nextkey = (" ")
/prevkey = ("p")
/nextlabel = "(Leertaste) nächste Seite..."
/prevlabel = "(p) vorherige Seite..."
</instruct>

<page welcome>

The block object has the timeout. Initializing the block object takes time before it starts running the first trial, and it may take a different amount of time on different systems running at different refresh rates -- to draw a stimulus to the screen, Inquisit necessarily has to wait for the start of a dispaly refresh cylce. It cannot draw stimuli while the display is in the middle of a refresh cycle. Same with trial objects. Moreover, your trial has to display error messages for some responses, so that would not be reflected at all when you simply add up latencies. In short, you cannot and should not expect the individual latencies to neatly sum up to exactly the set timeout value.

Dave
Dave
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Group: Administrators
Posts: 12K, Visits: 85K
Dave - 8/17/2022
buschmarie - 8/17/2022
Dear millisecond team,

I have created a program with inquisit lab 5. The subjects received a video as a stimulus and were asked to press a button to indicate what sensations they had. I use the latency times to calculate how long they felt relaxed for example.
The video timeout was 1191000ms long in total. If I add up all the latencies of a subject, I get different values. These values are slightly shorter than the total timeout. Here are the added latencies: 1190119, 1190547, 1190959, 1190860 etc.

Can you tell me how these different times arise so that I can explain this fact in my study?

Many thanks in advance.
Kind regards, Annemarie Busch

PS.: Here are excerpts from the program so you can understand more easy what I did

<video asmr_target>
/items = ("ASMR.mp4")
/playthrough = false
/position = (50, 50)
/size = (85%, 85%)
/erase = false
</video>
______________________________________________________________________
<text reminder_basline_left>
/items = ("A: keine besondere Empfindung")
/position = (10, 98)
/txcolor = (0, 0, 0)
/font = ("Calibri", -20, 700, 0, 49)
</text>

<text reminder_relaxation_middle>
/items = ("G: Entspannung")
/position = (50, 98)
/txcolor = (0, 0, 0)
/font = ("Calibri", -20, 700, 0, 49)
</text>

<text reminder_tingling_right>
/items = ("L: Tingles")
/position = (90, 98)
/txcolor = (0, 0, 0)
/font = ("Calibri", -20, 700, 0, 49)
</text>

<text current_time>
/ items= ("Zeit = <% script.currenttime %>")
/position = (4, 1)
/txcolor = (0, 0, 0)
/font = ("Calibri", -20, 700, 0, 49)
</text>

<text error>
/items = ("falsche Taste")
/select = noreplace
/position = (50, 3)
/txcolor = (200, 0, 0)
/fontstyle = ("Calibri", 2.50%, true, false, false, false, 5, 1)
</text>
______________________________________________________________________________
<trial asmr_target_measure>
/inputdevice = keyboard
/validresponse = (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65)
/correctresponse = (30, 34, 38)
/errormessage = true(error, 400)
/branch = [trial.asmr_target_measure]
</trial>
____________________________________________________________________________
<block preinstruction>
/preinstructions = (welcome, how_to1, how_to2, how_to3, instruction1, instruction2)
</block>

<block target>
/trials = [1=asmr_target_measure]
/bgstim = (asmr_target, reminder_basline_left, reminder_relaxation_middle, reminder_tingling_right, current_time)
/timeout = 1191000
</block>

<block postinstruction>
/postinstructions = (expt_end)
</block>

<expt>
/blocks = [1=preinstruction; 2=target; 3=postinstruction]
</expt>
_______________________________________________________________________________
<defaults>
/screencolor = (0, 0, 0)
/txcolor = (whitesmoke)
</defaults>
__________________________________________________________
<instruct>
/txcolor = (255, 255, 255)
/screencolor = (0, 0, 0)
/fontstyle = ("Calibri", 3.00%, false, false, false, false, 5, 1)
/nextkey = (" ")
/prevkey = ("p")
/nextlabel = "(Leertaste) nächste Seite..."
/prevlabel = "(p) vorherige Seite..."
</instruct>

<page welcome>

The block object has the timeout. Initializing the block object takes time before it starts running the first trial, and it may take a different amount of time on different systems running at different refresh rates -- to draw a stimulus to the screen, Inquisit necessarily has to wait for the start of a dispaly refresh cylce. It cannot draw stimuli while the display is in the middle of a refresh cycle. Same with trial objects. Moreover, your trial has to display error messages for some responses, so that would not be reflected at all when you simply add up latencies. In short, you cannot and should not expect the individual latencies to neatly sum up to exactly the set timeout value.

To illustratre the latter point about error message duration not being reflected in the latencies:


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