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Related Experiment Videos

The information transmitted at final position in visually triggered forearm movements.

B Sakitt, F Lestienne, T A Zeffiro

Biological Cybernetics

|January 1, 1983

Summary

Human forearm movements transmit little information per single action, suggesting complex movements require feedback for accuracy. Muscle activation patterns indicate motor programs focus on relative innervation, not absolute values.

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Area of Science:

Neuroscience
Biomechanics
Motor Control

Background:

Understanding the neural basis of visually guided movements is crucial for prosthetics and rehabilitation.
Information theory offers a quantitative framework to analyze the complexity of motor control.

Purpose of the Study:

To quantify the information transmitted by visually triggered forearm movements using an Information Theory approach.
To investigate the role of muscle activity (EMG) in motor programming and execution.

Main Methods:

Human subjects performed visually guided forearm movements at moderate speeds.
Information transmitted by final joint angle, biceps EMG, triceps EMG, and their ratio was calculated.
Experimental EMG ratios were compared to predictions from a theoretical spring model.

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Main Results:

Information transmitted by final joint angle increased with target number, plateauing around 3 bits (less than 9 distinct positions).
The ratio of biceps to triceps EMG transmitted more information than either muscle alone.
Experimental EMG ratios showed good agreement with a theoretical spring model.

Conclusions:

Visually guided forearm movements transmit limited information, implying that fine motor accuracy relies on feedback mechanisms.
Motor programs for reaching likely utilize relative muscle innervation ratios rather than absolute muscle activation levels.