Aimed Movement Task

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Screen shot of PEBL's Digit Span Test

Contents

[edit] About

This test is designed to evaluate Fitts's law. Unlike many standard Fitts's law tests, it does not use repeated aimed movements, but rather each trial requires a single movement to a single target.

[edit] Notes

Located in battery/fitts/fitts.pbl

[edit] Options

Look in the fitts.pbl file to modify the following options:


  targdist <- [50,75,100,200,350,500,700]  #The pool of distances to use
  targsize <- [10,20,40]    #The pool of target sizes to use
  reps     <- 10       ##Number of times through list

  gTargCol  <- MakeColor("red")  #Target color
  gStartx <- 50                  #starting x position
  gTargHeight <- 50              #target height
  gShowPreview <- 0              #Can you see the target before you move?

[edit] Data Output

Two files are saved. fitts-x.txt saves one line per trial. Its columns are:

subject code trial preview targdist targsize mousex mousey clicks RT:

Note that clicks is not used here.

0 1 3 350 10 0 403 309 0 1778
0 2 3 350 10 0 405 314 0 1356
0 3 3 350 20 0 409 297 0 1152
0 4 3 700 40 0 744 304 0 1420
0 5 3 500 20 0 547 296 0 1121
0 6 3 100 40 0 133 293 0 991
0 7 3 500 10 0 551 284 0 790

fittspoints-x.txt saves a mouse position log at every screen refresh.

Its columns are: trial targsize targdist time xpos, ypos

1 10 350 1471 50 299 
1 10 350 1514 52 297 
1 10 350 1546 53 297 
1 10 350 1580 53 297 
1 10 350 1613 53 297 
1 10 350 1645 53 297 
1 10 350 1679 53 297 
1 10 350 1713 53 297 
1 10 350 1746 53 297 
1 10 350 1778 71 291 
1 10 350 1813 98 288 

[edit] References

Fitts, P. M. (1954). The information capacity of the human motor system in controlling the amplitude of movement, Journal of Experimental Psychology 47, 381-391.

[edit] See Also

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