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Transfer of learned object manipulations between two- and five-digit grasps
Jordana Ulloa-Marquez1, Jennifer Gutterman1, Marco Santello2
1Department of Biobehavioral Sciences, Teachers College, Columbia University, New York, NY, 10027, USA.
Experimental Brain Research
|February 26, 2025
Summary
Learned object manipulation skills transfer between two-digit and five-digit grips. This suggests the brain uses general strategies for controlling forces and torques, enabling adaptation to different hand configurations.
Area of Science:
- Biomechanics
- Motor Control
- Human Factors
Background:
- Object manipulation requires precise force scaling and motor planning.
- Learning to control forces with one grip configuration may generalize to others.
- Investigating transfer between different numbers of digits (two vs. five) presents challenges in force distribution.
Purpose of the Study:
- To determine if manipulation skills learned with a two-digit grip transfer to a five-digit grip, and vice versa.
- To analyze the challenges in force distribution and stability when switching grip types.
- To explore the underlying neural representations of object manipulation across different effector configurations.
Main Methods:
- Participants performed a task requiring compensatory torque (Tcom) and vertical forces to stabilize an object with asymmetrical mass distribution.
- Subjects learned the task using either a two-digit or five-digit grip in blocked trials.
- Grip type was then switched to assess learning transfer, measuring grip forces (GF), center of pressure (CoP), and Tcom.
Main Results:
- Learning transfer was supported between two-digit and five-digit grips, despite initial stability challenges.
- Significant improvements in minimizing object roll were observed from initial novel trials to later transfer trials.
- Adaptations in grip forces, center of pressure, and compensatory torque demonstrated successful skill generalization.
Conclusions:
- Learned object manipulation skills generalize across different grip types (two-digit and five-digit).
- Findings suggest effector-independent representations for motor control of manipulation.
- Some limitations in force distribution and digit positioning persist during grip-type transitions.
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