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Updated: Jun 27, 2026

A Tactile Automated Passive-Finger Stimulator (TAPS)

A Tactile Automated Passive-Finger Stimulator (TAPS)

Published on: June 3, 2009

Task-specific modulation of multi-digit forces to object texture.

Tara L McIsaac¹, Marco Santello, Jamie A Johnston

¹Department of Biobehavioral Sciences, Teachers College, Columbia University, 525 West 120th Street, Box 199, New York, NY, 10027, USA. mcisaac@tc.columbia.edu

Experimental Brain Research

|December 20, 2008

Summary

This summary is machine-generated.

Grasping force responses to texture changes are not automatic. The brain adjusts grip force sharing based on task demands, like holding an object versus simply producing lifting forces, indicating context is crucial for understanding multi-digit coordination.

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Last Updated: Jun 27, 2026

A Tactile Automated Passive-Finger Stimulator (TAPS)

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Published on: June 3, 2009

Applying Incongruent Visual-Tactile Stimuli during Object Transfer with Vibro-Tactile Feedback

Applying Incongruent Visual-Tactile Stimuli during Object Transfer with Vibro-Tactile Feedback

Published on: May 23, 2019

Area of Science:

Neuroscience
Biomechanics
Human motor control

Background:

Multi-digit grasping involves complex force adjustments.
Previous research shows local and non-local digit force responses to texture changes.
The role of gravity and task context in force distribution remains unclear.

Purpose of the Study:

To investigate if grasp force sharing patterns change when the need to counteract gravity is removed.
To determine if behavioral context influences multi-digit force responses to texture variations.

Main Methods:

Two tasks were used: object hold (OH) against gravity and force production (FP) simulating lifting forces.
Subjects grasped an instrumented object with varying textures (sandpaper, rayon).
Normal and tangential forces at all five digits were measured during texture changes.

Main Results:

Texture changes elicited force responses in both single and other digits across both tasks.
The pattern of force distribution differed significantly between the OH and FP tasks.
Subjects prioritized moment equilibrium in OH but not in FP when object orientation was not at risk.

Conclusions:

Multi-digit force responses to texture are context-dependent, not obligatory.
Task behavioral context, including gravity constraints, significantly influences grasp force coordination.
Future research on grasping should consider the specific behavioral context of the task.