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Unconstrained three-dimensional reaching in rhesus monkeys.

Devin L Jindrich¹, Gregoire Courtine, James J Liu

¹School of Life Sciences, Center for Adaptive Neural Systems, 427 E. Tyler Mall, LSE 216, Arizona State University, Tempe, AZ 85287-4501, USA. devin.jindrich@asu.edu

Experimental Brain Research

|December 21, 2010

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Researchers studied arm movements in monkeys to understand normal motor control. This research helps quantify recovery after spinal cord injury and assess therapeutic interventions.

Area of Science:

Neuroscience
Biomechanics
Primate Motor Control

Background:

Understanding normative motor behavior is crucial for evaluating recovery after neurological injury.
Quantitative assessment of motor function aids in tracking progress and intervention effectiveness.

Purpose of the Study:

To characterize normative three-dimensional arm movements and joint moments in non-injured rhesus monkeys during a food-retrieval task.
To establish a baseline for quantitative evaluation of motor recovery post-injury.

Main Methods:

Recorded three-dimensional kinematics and muscle activity during reaching and grasping.
Utilized inverse dynamics to calculate joint moments (gravity, segmental interactions, muscle/tissue forces).
Analyzed relationships between joint moments and muscle activation patterns.

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Main Results:

Endpoint paths exhibited 3D curvature, not constrained to straight lines.
Gravitational moments dominated joint moments; muscle and interaction moments were less significant.
Antagonistic muscles (elbow, hand) were co-activated; relationships between shoulder and elbow moments were linear.

Conclusions:

Monkeys utilize strategies where gravity plays a dominant role in arm movements.
Joint behavior can be modeled using spring-like properties influenced by gravity and interaction moments.
These findings provide a quantitative basis for assessing prehension recovery after spinal cord injury.