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Updated: Jul 15, 2026
12:33
Corticospinal Excitability Modulation During Action Observation
Published on: December 31, 2013
Fitts's law holds for action perception.
Marc Grosjean1, Maggie Shiffrar, Günther Knoblich
1Max Planck Institute for Human Cognitive and Brain Sciences, Munich, Germany. grosjean@ifado.de
Psychological Science
|April 12, 2007
Summary
Fitts's law, a principle of human movement, accurately predicts perceived action speed and accuracy for both human and robot arm movements. This finding extends the law
Area of Science:
- Cognitive Psychology
- Human-Computer Interaction
- Motor Control
Background:
- Fitts's law describes the trade-off between speed and accuracy in human movements.
- Existing research primarily focuses on performed and imagined movements.
Purpose of the Study:
- To investigate if Fitts's law applies to the perception of observed actions.
- To determine the generalizability of Fitts's law to biological and non-biological agents.
Main Methods:
- Participants viewed apparent motion displays of arm movements between targets.
- Variables included target width, target separation, and movement speed.
- Subjects judged the possibility of movement at perceived speeds.
Main Results:
- Perceived movement times aligned with Fitts's law predictions for human actions (r² = .96).
- The same lawful relationship was observed for perceived robot arm movements (r² = .93).
Conclusions:
- Fitts's law extends to the perception of observed biological and non-biological movements.
- This study establishes Fitts's law as a fundamental motor principle applicable across diverse action perception contexts.
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