Bilateral Transfer: Train One Hand, Test the Other

In a motor learning experiment, half the class practices a skill with the dominant hand while the other half doesn't practice, and both groups test improvement in the non-dominant hand. The activity explains how the central nervous system transfers motor programs between hemispheres and what that means for training and injury recovery.

How to play

1. Explain the design: pretest, practice and posttest, with a control group; connect it to the motor cortex and the corpus callosum (4 min).
2. Pretest in pairs: number of tennis ball wall bounces in 30 seconds and number of dribbles through a cone slalom in 30 seconds, both with the non-dominant hand (6 min).
3. Practice phase: the experimental group trains both skills for 10 minutes with the dominant hand only; the control group does ball-free leg work like lunges and imaginary jump rope (10 min).
4. Posttest with the non-dominant hand under the same conditions as the pretest (6 min).
5. Compare each group's average improvement in a table and discuss whether transfer happened and why (4 min).

Rules

• Pairs stand 10 feet apart along the wall so balls don't cross.
• The slalom is done in separate lanes and in one direction only.
• Pretest and posttest conditions must be identical for the data to count.
• The same person always does the recording.

Variations

Adaptations

• Wheelchair user: do the wall bounces seated and the slalom pushing with one hand and dribbling with the other on a wider course.
• Hemiparesis or one-hand injury: adapt the design to the feet, practicing ball dribbling with the dominant foot and testing the other.
• Autism: see the phases ahead of time in a visual chart and keep the same recording role in the pair.

Learning goals

• Understand bilateral transfer in motor learning.
• Apply a simple experimental design with a control group.
• Relate how the nervous system works to skill improvement.

Equipment for a class of 25

• tennis balls: 14
• balls: 14
• cones: 24
• stopwatch: 14
• worksheets: 28

Teacher tip

Transfer usually shows up but is small: have students judge it against the control group, which also improves a bit from the learning effect of the test.

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