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Related Experiment Videos

When does action resist visual illusions? Effector position modulates illusory influences on motor responses.

Nicola Bruno1, Paolo Bernardis

  • 1Dipartimento di Psicologia and BRAIN Centro Interdipartimentale per le Neuroscienze, Università di Trieste, via S. Anastasio 12, 34134, Trieste, Italy. Nicola.Bruno@univ.trieste.it

Experimental Brain Research
|June 5, 2003
PubMed
Summary

This study investigated visual illusions and motor responses. Spatial illusory effects were observed in closed-loop and some open-loop conditions, but not others, impacting visuomotor transformations.

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Area of Science:

  • Perception and Action
  • Visuomotor Neuroscience
  • Psychophysics

Background:

  • Spatial illusions, such as Kanizsa's compression and Müller-Lyer illusions, distort the perceived extent of visual stimuli.
  • Understanding how these illusions affect motor responses is crucial for modeling visuomotor transformations.

Purpose of the Study:

  • To investigate the influence of spatial illusory effects on motor reproduction of perceived horizontal extent.
  • To compare open-loop and closed-loop motor responses in the context of visual illusions.
  • To explore the role of response initiation point and visual feedback on illusory effects.

Main Methods:

  • Participants reproduced the apparent length of horizontal segments presented in isolation or within spatial illusion patterns (Kanizsa, Müller-Lyer).

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  • Motor responses were measured using a touch monitor, recording movement amplitudes and times for both open-loop and closed-loop conditions.
  • Four experimental conditions varied the response type (open/closed-loop) and the starting position relative to the visual stimulus.

    • Main Results:

    • Illusory effects were comparable to standard visual matching experiments in closed-loop and specific open-loop conditions (starting from the right endpoint).
    • Significantly reduced or absent illusory effects were observed in other open-loop conditions (starting from the left endpoint or displaced vertically).
    • The results highlight the importance of visual feedback and response initiation point in mediating illusory effects on motor actions.

    Conclusions:

    • Visuomotor transformations are sensitive to the type of visual feedback and the spatial relationship between the stimulus and the motor response initiation.
    • The findings provide insights into the mechanisms underlying the perception of extent and its reproduction through motor actions.
    • The study suggests that different visuomotor pathways may be involved depending on the specific task conditions and feedback availability.