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The size-weight illusion in team lifting.

Yoko K Naylor¹, Eric L Amazeen

¹Arizona State University, Tempe, Arizona, USA.

|September 14, 2004

Summary

When lifting containers as a team, a size-weight illusion occurs, where larger items feel lighter. This effect was more pronounced during team lifts compared to individual lifts.

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Area of Science:

Human Perception and Cognition
Biomechanics and Ergonomics
Occupational Safety

Background:

The size-weight illusion, where larger objects are perceived as lighter than smaller objects of equal weight, is a well-documented phenomenon in psychophysics.
Understanding perceptual biases is crucial for optimizing human-machine interactions and safety protocols, particularly in tasks involving manual material handling.

Purpose of the Study:

To investigate the presence and magnitude of the size-weight illusion during team lifting tasks.
To compare the size-weight illusion in team lifting versus individual lifting scenarios.
To explore potential applications for developing safer team lifting guidelines.

Main Methods:

Two experiments were conducted involving participants lifting a set of 16 containers varying in mass and volume.
Experiment 1 involved teams of participants lifting the containers, while Experiment 2 involved individual participants lifting the same containers.
Participants reported their perceptions of perceived heaviness and volume for each container.

Main Results:

A significant size-weight illusion was observed in both team and individual lifting conditions, with larger containers perceived as lighter.
The magnitude of the size-weight illusion was greater when containers were lifted by a team compared to individually.
Mean perceived heaviness was also higher in the team lifting condition.

Conclusions:

The size-weight illusion persists and is amplified during team lifting tasks.
Findings suggest that perceptual biases in weight estimation are influenced by the collaborative nature of the lifting effort.
This research has implications for refining ergonomic guidelines and training programs for manual team lifting to enhance safety and efficiency.

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