Simon Task

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A screenshot of PEBL's Simon task.

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[edit] About

This Simon task is a classic S-R compatibility and interference task, and is related to executive function, response suppression, and interference suppression.

The goal of the task is to respond to the color of the stimulus (red versus blue with right versus left hand), while ignoring the position (left or right of baseline). This task incorporates an additional aspect explored by Yamaguchi & Proctor that looks at how far right or left of baseline the item is; the more offset, the larger interference typically is. One can aggregate over left versus right position (negative or positive) to create a simple interference score.

[edit] Notes

[edit] Options

The following parameters are available:

  • reps (10): this is how many repetitions of the 14-trial design, so 10 is 140 trials
  • targsize: pixel radius of circle stimuli
  • leftcolor: color name for left color
  • rightcolor: color name for right color

[edit] Data Output

Data are saved in a tabular format in data\subnum\simon-subnum.csv:

subnum	trial	type	pos	resp	corr	time	rt
33	1	1	100	<lshift>	1	7784	624
33	2	1	-200	<lshift>	1	9128	607
33	3	2	200	<rshift>	1	10418	452


columns refer to:

  • subnum: participant code
  • trial: ordinal counter for trial
  • type: stimulus type (leftcolor versus rightcolor)
  • pos: position from center. This relates to Yamaguchi and Proctor's finding that distance from center impacts interference.
  • resp: the response that was made (left or right shift)
  • corr: whether the response was correct
  • time: absolute time counter, in ms, of the trial completion
  • rt: response time, in ms


In addition, a summary file (data\subnum\simon-summary-subnum.txt) is recorded that provides response time and accuarcy by condition.

This summarizes for both colors(1 and 2) the RT and accuracy for each eccentricity condition.


PEBL Simon Test: Summary data
PEBL Version 2.0
Tue Oct 10 11:18:10 2017
Response times:
condition  N   median  mean    sd
---------------------------------
1|-200 10 367.5 408.9 99.171
1|-100 10 454.5 551.6 254.316
1|-50 10 401.5 431 123.414
1|0 10 409 562.7 281.923
1|50 10 429 456.2 140.692
1|100 10 419.5 426.4 67.365
1|200 10 434 437.3 73.2831

2|-200 10 409.5 440 130.396
2|-100 10 414 426.1 100.031
2|-50 10 433.5 482.6 128.537
2|0 10 429.5 531.9 218.388
2|50 10 428.5 581.1 280.72
2|100 10 482 504.5 176.935
2|200 10 392.5 431.9 102.126


Accuracy:
condition  N   median  mean    sd
---------------------------------
1|-200 10 1 1 0
1|-100 10 1 0.9 0.3
1|-50 10 1 0.9 0.3
1|0 10 1 1 0
1|50 10 1 0.8 0.4
1|100 10 1 1 0
1|200 10 1 0.9 0.3

2|-200 10 1 0.8 0.4
2|-100 10 1 0.7 0.458258
2|-50 10 1 1 0
2|0 10 1 0.8 0.4
2|50 10 1 0.9 0.3
2|100 10 1 1 0
2|200 10 1 1 0

[edit] References

Yamaguchi, M., & Proctor, R. W. (2012). Multidimensional vector model of stimulus-response compatibility. Psychological Review, 119, 272-303.

[edit] See Also

PEBL Test Battery

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