Simple Response Time

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Screen shot of PEBL's Simple Reaction Time Task

Contents

[edit] About

This is a simple reaction time task, in which a single stimulus (an 'X') appears at a specifiable delay (250 to 2500 ms) from the previous response. We begin with 4 blocks of 50 trials; with a break between blocks. Report tells min, med, max, mean and stdev of responses, number of anticipations.

[edit] Notes

  • Located in battery/srt/SimpleRT.pbl
  • Task takes about 6 minutes

[edit] Options

Number of blocks and blocklength set here:

 blocks <- 4              ## The number of trial blocks
 blocklength <-  50       ## The number of trials per block

Different delays used specified by the following list:

 delays <- [250, 500,750, 1000,1250,1500,1750,2000,2250,2500]

Stimuus character:

 stimulus <- "X"          ## Character to use as stimulus.

These are threshold for rts considered too fast and too slow, and are not used in the RT stats computations

 toofastThresh <- 150
 tooslowThresh <- 3000

[edit] Data Output

Data are output to two files:

Data is saved to file srt-<gsubnum>.txt. Columns are: subject_id block trial_in_block absolute_time delay measured_delay rt too_fast_resp resp

pebl 1 1 13460 500 517 971 [<timeout>] x
pebl 1 2 14987 1000 1022 208 [<timeout>] x
pebl 1 3 16251 1750 1766 255 [<timeout>] x
pebl 1 4 18305 750 766 262 [<timeout>] x
pebl 1 5 19365 750 766 215 [<timeout>] x
pebl 1 6 20377 500 516 309 [<timeout>] x
pebl 1 7 21234 1500 1516 197 [<timeout>] x
pebl 1 8 22980 750 768 207 [<timeout>] x
pebl 1 9 23989 1250 1264 200 [<timeout>] x
pebl 1 10 25484 1250 1269 208 [<timeout>] x
pebl 1 11 26994 750 765 228 [<timeout>] x
pebl 1 12 28019 750 766 213 [<timeout>] x
pebl 1 13 29031 2000 2016 207 [<timeout>] x
pebl 1 14 31287 1500 1515 217 [<timeout>] x
pebl 1 15 33051 1750 1766 213 [<timeout>] x
pebl 1 16 35062 1000 1016 221 [<timeout>] x
pebl 1 17 36330 2000 2015 282 [<timeout>] x
pebl 1 18 38659 2250 1040 217 x x
pebl 1 19 41158 1250 1199 331 x x

A summary of the results, with means and standard deviations across delays, is output to srt-report-<gsubnum>.txt. An example output:

------------------------------------------------------
 Report for PEBL Simple Response Time Task Version 0.2
 PEBL Version 0.10
 Sat Mar 20 19:07:27 2010
 http://pebl.sf.net
 Participant Code: pebl
------------------------------------------------------
Statistic                 Value
------------------------------------------------------
Number of blocks            4
Trials per blocks           50
Stimulus                    X
Total Trials                50
Anticipations (<150)        5
Delayed Responses (>3000)   0
Correct RT Mean             275.354
Correct RT Median           250
Correct RT Min              164
Correct RT Max              971
Correct RT SD               92.2933

   Delay     N         Mean      Std. Dev
   --------------------------------------
   250       20        382.6     99.1375   
   500       20        348.4     148.906   
   750       20        258.25    45.6748   
   1000      19        248.474   35.0764   
   1250      20        244.25    37.3482   
   1500      20        256       51.2152   
   1750      20        241.75    22.1447   
   2000      19        240.632   30.5308   
   2250      17        282.118   150.516   
   2500      20        249       31.2682   
------------------------------------------------------

Sample results from a single run of the test: Sample output from PEBL's Simple Reaction Time Task

[edit] References

Robinson, M. C. and M. Tamir. (2005). Neuroticism as mental noise: a relation between neuroticism and reaction time standard deviations. Journal of Personality and Social Psychology 89(1): 107-115.

Seashore, R. H.., & Seashore, S. H. (1941). Individual differences in simple auditory reaction times of hands, feet, and jaws. Journal of Experimental Psychology, 9, 346-349.

[edit] See Also

PEBL Test Battery

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