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The Intelligent Movement MachineAn Ethological Perspective on the Primate Motor System$
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Michael Graziano

Print publication date: 2009

Print ISBN-13: 9780195326703

Published to Oxford Scholarship Online: May 2009

DOI: 10.1093/acprof:oso/9780195326703.001.0001

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Dimensionality Reduction as a Theory of Motor Cortex Organization

Dimensionality Reduction as a Theory of Motor Cortex Organization

Chapter:
(p.151) Chapter 10 Dimensionality Reduction as a Theory of Motor Cortex Organization
Source:
The Intelligent Movement Machine
Author(s):

Michael S. A. Graziano

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780195326703.003.0010

The classical description of motor cortex as a map of the body is inaccurate, this chapter states. The map is blurred, overlapping, and partially repeated in ways that are difficult to pin down. The common modern description of motor cortex as a mosaic of separate areas with different functions is, first, an oversimplification of a blurred and subtle pattern, and second, merely a description without an underlying explanation. This chapter presents a model that reduces the movement repertoire onto the cortical sheet, which appears finally to provide a working explanation of the layout of motor cortex. The model was based on three types of movement dimension: somatotopic, ethological action category, and spatial.

Keywords:   monkeys, topography, movement, cortical sheet, classical description

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