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Related Experiment Video

Updated: Jul 3, 2026

Quantitative Hardness Measurement by Instrumented AFM-indentation

Quantitative Hardness Measurement by Instrumented AFM-indentation

Published on: November 22, 2016

Magnitude estimation of softness.

Robert M Friedman¹, Kim D Hester, Barry G Green

¹Department of Anesthesiology, Yale University School of Medicine, PO Box 208051, 333 Cedar Street, New Haven, CT 06520, USA. robert.friedman@vanderbilt.edu

Experimental Brain Research

|August 6, 2008

Summary

Humans can accurately estimate silicone rubber softness using touch, even without direct skin contact. Softness perception relies on object deformation, with kinesthetic and vibratory cues also influencing judgment.

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Area of Science:

Haptics
Human Perception
Material Science

Background:

Estimating material properties like softness is crucial for object interaction.
The human sensory system integrates multiple cues for accurate perception.

Purpose of the Study:

To investigate how humans perceive and scale the softness of silicone rubber under varying contact conditions.
To determine the relative importance of tactile and kinesthetic cues in softness perception.

Main Methods:

Participants actively indented silicone rubber disks or received passive indentations.
Contact modes included direct finger pad contact, passive stimulation, and tool-mediated indentation (stylus).
Tactile and kinesthetic cues were manipulated by altering the contact method.

Main Results:

Softness scaling was consistent across different contact modes, indicating robust perception.
Perception of softness was independent of peak force and force rate within tested ranges.
The mode of contact influenced the scaling function, with more cues leading to steeper slopes.
Objects were classified as soft if their compliance exceeded that of the human finger.

Conclusions:

Tactile information about object deformation is sufficient for magnitude scaling of softness.
Object conformity to the body influences softness classification.
Kinesthetic and vibratory cues are typically used, especially when direct skin contact is absent.