Objects feel stiffer in the nondominant hand when comparing between hands

Area of Science:

• Human-computer interaction
• Neuroscience
• Psychophysics

Background:

• Stiffness perception is crucial for object interaction, like assessing fruit ripeness.
• Previous research focused on single-hand (unimanual) object interaction.
• Limited understanding exists regarding stiffness perception across different hand interactions.

Purpose of the Study:

• To investigate stiffness perception when interacting with virtual elastic objects using different hands.
• To compare stiffness judgments made with the same hand versus different hands.

Main Methods:

• Participants compared stiffness of virtual objects probed sequentially.
• Two conditions were tested: both objects probed with the same hand, or each object probed with a different hand.
• Participants reported which object felt stiffer.

Main Results:

• Reliable stiffness discrimination occurred when using the same hand.
• When using different hands, objects probed by the nondominant hand were perceived as stiffer.
• Right-handed individuals found objects touched by the left hand stiffer, and vice-versa for left-handed individuals.

Conclusions:

• Hand dominance significantly influences stiffness perception.
• This finding advances the understanding of somatosensory perception in manual interactions.
• Results have implications for designing bimanual interfaces in virtual reality, teleoperation, and simulation.