scholarly journals Primate motor cortex and free arm movements to visual targets in three- dimensional space. II. Coding of the direction of movement by a neuronal population

1988 ◽  
Vol 8 (8) ◽  
pp. 2928-2937 ◽  
Author(s):  
AP Georgopoulos ◽  
RE Kettner ◽  
AB Schwartz
Keyword(s):  
Motor Cortex ◽  
Dimensional Space ◽  
Three Dimensional ◽  
Arm Movements ◽  
Neuronal Population ◽  
Direction Of Movement ◽  
Visual Targets ◽  
Three Dimensional Space

Path constraints on point-to-point arm movements in three-dimensional space

Neuroscience ◽  
1986 ◽  
Vol 17 (2) ◽  
pp. 313-324 ◽  
Author(s):  
F. Lacquaniti ◽  
J.F. Soechting ◽  
S.A. Terzuolo
Keyword(s):  
Dimensional Space ◽  
Three Dimensional ◽  
Arm Movements ◽  
Path Constraints ◽  
Point To Point ◽  
Three Dimensional Space

Sensorimotor transformations underlying the organization of arm movements in three-dimensional space

1988 ◽  
Vol 66 (4) ◽  
pp. 502-507 ◽  
Author(s):  
J. F. Soechting ◽  
C. A. Terzuolo
Keyword(s):  
Dimensional Space ◽  
Three Dimensional ◽  
Arm Movements ◽  
Motor Tasks ◽  
Intrinsic Parameters ◽  
Sensorimotor Transformations ◽  
Three Dimensional Space

Coordinated movements in three-dimensional space involve sensorimotor transformations between extrinsic and intrinsic coordinates. It is hypothesized that a key aspect underlying the organization of such movements is the need to simplify these transformations by means of suitable approximations and the imposition of constraints. Motor tasks involving the drawing of circles and ellipses in different planes were analyzed from this perspective, and some rules are presented whereby the plane of motion and the slant of an ellipse can be specified in a simple way in terms of intrinsic parameters. It is shown that these rules can be generalized to hold for more complicated wrist motions if one assumes that they consist of segments of elliptical arcs.

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