AAT medianlatency "Difference between medianlatency vs. medianRT"


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Anni
Anni
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Dave - Tuesday, October 24, 2017
Anni - Tuesday, October 24, 2017
Hej!

Actiually I have no idea, how this can work...:

I got 2 Diff_Scores:
Cat1: medianlatency_AAT_1 - medianlatency_AAT_2
Cat 2: medianlatency_AAT_3 - medianlatency_AAT_4
 and
4 categories: medianRT_AAT_1, medianRT_AAT_2, medianRT_AAT_3, medianRT_AAT_4,

BUT: If I put medianRT in Excel for calculating a Diff_Score myself, it's not the same value I got in my summary file... I also tried this without the error vaules.
I tried to got a medianlatency for each of the 4 categories, but it didn't work.

Is there a difference in latency and RT?
How could I calculate myself a Diff-Score which is simular to the summary file?

Sorry because of my english, its not my mothertongue...

Thank you very much for help!!
Anni




The latencies those scores are calculated on are the latencies from the <trial> elements AAT_1 to AAT_8

<trial AAT_1>
...
/ ontrialend = [
  ...;
    if (trial.AAT_1.correct) {
        list.AAT1correctlatencies.insertitem(trial.AAT_1.latency, 1);
...;};
]
...
</trial>

Only correct trials are considered.

> Is there a difference in latency and RT?

No. values.RT captures the same thing:

<trial AAT_1>
...
/ ontrialend = [
...
    values.RT = trial.AAT_1.latency;
    values.correct = trial.AAT_1.correct;
...
]
...
</trial>

So, in summary, calculating the median of RTs for all _correct_ instances of <trial AAT_1>, <trial AAT_2>, etc. and then calculating the difference should give you the same result. Note, though, that the order of terms in the difference calculation varies according to the experimental condition (values.expcondition):

<expressions>
...
/ AAT_Diffscore_Cat1 = if (values.expcondition == 1) list.AAT1correctlatencies.median - list.AAT2correctlatencies.median else
list.AAT2correctlatencies.median - list.AAT1correctlatencies.median
...
</expressions>

median latency of AAT_1 - median latency of AAT_2 in the 1st condition, and
median latency of AAT_2 - median latency of AAT_1 in the 2nd condition.

(Analogously for the other categories / difference scores.)

Hope this helps.

Hej,
thanks for the fast reply!
Don't know why, but it's not the same result calculating the medianRT and the Diff_Score if I put out the mistakes...
I have all RTs and put all incorrect out. I did this in Excel.
Then I calculated the median for each AAT1, AAT2, AAT3 und AAT4 (I have just 4...)
Then I calculated the difference.

I also have the medianlatency.
But these median is not the same as the RTmedian (RT without mistakes).

I don't understand, in which way Inquisit built the medianlatency...

Maybe I did something weird I can't find.

Thanks!!!
Anni


Dave
Dave
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Anni - Tuesday, October 24, 2017
Hej!

Actiually I have no idea, how this can work...:

I got 2 Diff_Scores:
Cat1: medianlatency_AAT_1 - medianlatency_AAT_2
Cat 2: medianlatency_AAT_3 - medianlatency_AAT_4
 and
4 categories: medianRT_AAT_1, medianRT_AAT_2, medianRT_AAT_3, medianRT_AAT_4,

BUT: If I put medianRT in Excel for calculating a Diff_Score myself, it's not the same value I got in my summary file... I also tried this without the error vaules.
I tried to got a medianlatency for each of the 4 categories, but it didn't work.

Is there a difference in latency and RT?
How could I calculate myself a Diff-Score which is simular to the summary file?

Sorry because of my english, its not my mothertongue...

Thank you very much for help!!
Anni




The latencies those scores are calculated on are the latencies from the <trial> elements AAT_1 to AAT_8

<trial AAT_1>
...
/ ontrialend = [
  ...;
    if (trial.AAT_1.correct) {
        list.AAT1correctlatencies.insertitem(trial.AAT_1.latency, 1);
...;};
]
...
</trial>

Only correct trials are considered.

> Is there a difference in latency and RT?

No. values.RT captures the same thing:

<trial AAT_1>
...
/ ontrialend = [
...
    values.RT = trial.AAT_1.latency;
    values.correct = trial.AAT_1.correct;
...
]
...
</trial>

So, in summary, calculating the median of RTs for all _correct_ instances of <trial AAT_1>, <trial AAT_2>, etc. and then calculating the difference should give you the same result. Note, though, that the order of terms in the difference calculation varies according to the experimental condition (values.expcondition):

<expressions>
...
/ AAT_Diffscore_Cat1 = if (values.expcondition == 1) list.AAT1correctlatencies.median - list.AAT2correctlatencies.median else
list.AAT2correctlatencies.median - list.AAT1correctlatencies.median
...
</expressions>

median latency of AAT_1 - median latency of AAT_2 in the 1st condition, and
median latency of AAT_2 - median latency of AAT_1 in the 2nd condition.

(Analogously for the other categories / difference scores.)

Hope this helps.

Anni
Anni
Partner Member (718 reputation)Partner Member (718 reputation)Partner Member (718 reputation)Partner Member (718 reputation)Partner Member (718 reputation)Partner Member (718 reputation)Partner Member (718 reputation)Partner Member (718 reputation)Partner Member (718 reputation)
Group: Forum Members
Posts: 9, Visits: 10
Hej!

Actiually I have no idea, how this can work...:

I got 2 Diff_Scores:
Cat1: medianlatency_AAT_1 - medianlatency_AAT_2
Cat 2: medianlatency_AAT_3 - medianlatency_AAT_4
 and
4 categories: medianRT_AAT_1, medianRT_AAT_2, medianRT_AAT_3, medianRT_AAT_4,

BUT: If I put medianRT in Excel for calculating a Diff_Score myself, it's not the same value I got in my summary file... I also tried this without the error vaules.
I tried to got a medianlatency for each of the 4 categories, but it didn't work.

Is there a difference in latency and RT?
How could I calculate myself a Diff-Score which is simular to the summary file?

Sorry because of my english, its not my mothertongue...

Thank you very much for help!!
Anni




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