Motion Quartet

Motion Quartet preview image

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WHAT IS IT?

The motion quartet is a well-known paradigm in the study of perception of apparent motion. We perceive either vertical or horizontal motion, with spontenous switches between the two percepts. Several studies have demonstrated hysteresis in the switches between percepts (e.g., Ploeger, A., Van Der Maas, H. L. J., & Hartelman, P. A. I. (2002). Stochastic catastrophe analysis of switches in the perception of apparent motion. Psychonomic Bulletin & Review, 9(1), 26-42. https://doi.org/10.3758/BF03196255).

HOW IT WORKS

Jumps and hystersis occur by manipulating the aspect ratio, i.e., the horizontal distance divided by the vertical distance.

HOW TO USE IT

With horizontal-distance and vertical-distance you can manipulate the aspect ratio. Interval-time controls the speed of the movement. When Experiment is on, the aspect ratio changes slowly. Press H and V to indicate whether you see horizontal or vertical motion. Other controls manipulate the stimuli.

THINGS TO NOTICE

Check if the perception is characterized by jumps and hysteresis

THINGS TO TRY

By using different objects for the two pairs of stimuli, percepts are expected to be more stable.

EXTENDING THE MODEL

Rore quartets or more complex configurations

Comments and Questions

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Click to Run Model

globals [horizontal-value]

to setup
  clear-all
  reset-ticks
  create-turtles 4 [set color black]
  set experiment False
  set horizontal-value 1
  set horizontal-distance 5
  set vertical-distance 15
  set shape-one "circle"
  set shape-two "circle"
end 

to go
  tick
  ask turtles with [remainder who 2 = 0]
  [   set shape shape-one]
  ask turtles with [ remainder who 2 = 1]
  [   set shape shape-two]
  ask turtles [
   setxy horizontal-distance * ((remainder who 2) - .5) vertical-distance * ((floor (who / 2)) - .5)
   set size circle-size
   ifelse remainder ticks 2 = 0 xor remainder who 3 = 0
    [ set color black]
    [ set color brightness]
  ]
  if experiment
  [
  ifelse horizontal-value = 1
    [set horizontal-distance max list 5 (horizontal-distance + .1)
     set vertical-distance min list 20 (vertical-distance - .1)]
    [set horizontal-distance min list 20 (horizontal-distance - .1)
    set vertical-distance max list 5 (vertical-distance + .1)]
  ]

  wait Interval-time
end 

to horizontal
  set horizontal-value 1
end 

to vertical
  set horizontal-value -1
end 

There is only one version of this model, created about 1 year ago by Han L. J. van der Maas.

Attached files

File Type Description Last updated
Motion Quartet.png preview Preview for 'Motion Quartet' about 1 year ago, by Han L. J. van der Maas Download

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