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Table 1 Attributes and parameters of the arm position matching task

From: Systematic changes in position sense accompany normal aging across adulthood

Coordinate frame

Parameter

Abrv

Units

Definition

Hand-coordinates

Variability

Var

cm

Mean trial-by-trial variability of the active hand in x, y, and xy coordinates.

Systematic shift

Shift

cm

Systematic errors between the mean x and y positions of the active and passive hands.

Absolute error

AE

cm

Absolute errors between the mean x and y positions of the active and passive hands.

Spatial Cont/Exp

C/E

—

Ratio of: i) mean spatial area enclosed by the active hand to ii) mean spatial area of enclosed by the passive hand.

Joint-coordinates

Variability

Var

deg

Mean trial-by-trial variability of the shoulder and elbow angles of the active arm.

Systematic shift

Shift

deg

Systematic errors between the shoulder and elbow angles of the active and passive arms.

 

Absolute error

AE

deg

Absolute errors between the shoulder and elbow angles of the active and passive arms.