Table 3 Parameters recorded by the Kinarm and computed for the OH and OHA tasks [3]

Mean hand speed L/R

\(\text {cm}/\text {s}\)

The participant’s mean hand speed for the left/right hand during the trial.

Mean hand speed bias

\(\frac{\text {cm}/\text {s}}{\text {cm}/\text {s}}\)

A value from − 1 (all left hand) to 1 (all right hand) which describes the bias in mean hand speed between the hands.

Movement area L/R

\(\text {cm}^2\)

Area the participant used with the left/right hand during the trial. Determined by a convex hull that encompasses the complete hand path.

Movement area bias

\(\text {cm}^2/\text {cm}^2\)

A value from − 1 (all left hand) to 1 (all right hand) which describes the bias in movement areas between the hands.

Hand bias of hits

\(\text {n}/\text {n}\)

A value from − 1 (all left hand) to 1 (all right hand) that quantifies which hand is used more often for hitting targets.

Hand selection overlap

%

The sum of the hand switches for each bin, divided by the number of targets.

Miss bias

cm

Where in the workspace the participant’s misses are biased.

Hand transition

cm

Where in the workspace the participant’s preference for using one hand over the other switches.

Median error

%

Percentage of the way through the task (based on number of targets, not time) where the participant has recorded half of their misses.

Distractor proportion

%

Number of distractors hit as a proportion of the total number of objects (targets + distractors) hit. OHA only.

Object processing rate

Hz

Number of objects (targets + distractors) correctly processed when 80% of the task’s objects have been created. OHA only.

Steady-state rate

Hz

Number of targets hit per second while the participant is overwhelmed.

Targets hit

n

The number of targets hit during the trial.

Task scores

1

A global measure of the participant’s performance, with 0 indicating best performance and increasing values indicating worsening performance. Specifically, the root sum of squares distance of the participant’s Z-scores and Zeta-scores compared to healthy control participants.