Table 1 Summary of statistical results with ANOVAs on the main effect and interaction

Difficulty level

< 0.001 *

0.994

< 0.001 *

1.000

Task

< 0.001 *

1.000

0.003 *

0.910

Difficulty level × Task

< 0.001 *

0.999

0.031 *

0.682

CV of reaction time

Difficulty level

0.002 *

0.935

0.067

0.539

Task

0.018 *

0.740

< 0.001 *

0.999

Difficulty level × Task

0.070

0.631

0.128

0.439

Completion time

Difficulty level

< 0.001 *

1.000

< 0.001 *

1.000

Task

< 0.001 *

1.000

< 0.001 *

1.000

Difficulty level × Task

< 0.001 *

1.000

< 0.001 *

1.000

Motor correctness

Difficulty level

0.009 *

0.809

< 0.001 *

1.000

Task

< 0.001 *

0.998

< 0.001 *

1.000

Difficulty level × Task

0.003 *

0.923

< 0.001 *

1.000

Session 2, Part 1

Hand

Tongue

p

Observed power

p

Observed power

Speed

Difficulty level

< 0.001 *

1.000

0.066

0.536

Task

< 0.001 *

1.000

0.019 *

0.733

Difficulty level × Task

< 0.001 *

0.998

0.003 *

0.922

CV of time interval

Difficulty level

< 0.001 *

1.000

< 0.001 *

1.000

Task

0.491

0.160

0.004 *

0.901

Difficulty level × Task

< 0.001 *

1.000

0.072

0.626

Motor correctness

Difficulty level

< 0.001 *

1.000

< 0.001 *

1.000

Task

0.012 *

0.771

< 0.001 *

0.999

Difficulty level × Task

< 0.009 *

0.812

< 0.001 *

1.000

Session 2, Part 2

RSME

Waveform

< 0.001 *

1.000

0.001 *

0.966

Task

0.255

0.200

0.017 *

0.748

Waveform × Task

0.001 *

0.978

0.434

0.128