Bilateral transfer across ages 7 to 17 years

Area of Science:

• Motor control and learning
• Developmental psychology
• Human kinetics

Background:

• Bilateral transfer, the phenomenon where practice with one limb improves performance with the contralateral limb, is a key aspect of motor learning.
• Understanding how factors like age influence this transfer is crucial for developmental and rehabilitation sciences.

Purpose of the Study:

• To investigate the impact of age on the magnitude and direction of bilateral transfer in a motor task.
• To determine if practice with one hand enhances performance with the other hand, and if this effect varies with age.

Main Methods:

• Ninety-six girls aged 7–17 years participated.
• Participants performed a rotary pursuit tracking task for 14 trials.
• Intermanual transfer was assessed by comparing performance after practice with the preferred hand versus the nonpreferred hand.

Main Results:

• No significant differences in initial performance or learning during the first seven trials were found between groups, confirming the task's novelty.
• Older girls demonstrated significantly greater improvement in time on target with the second hand compared to younger girls.
• Motor skill transfer was more pronounced from the preferred to the nonpreferred hand than in the reverse direction.

Conclusions:

• Age is a significant factor influencing bilateral transfer, with older individuals benefiting more from cross-limb practice.
• The findings suggest developmental changes in the neural mechanisms underlying intermanual motor learning.
• The direction of transfer (preferred to nonpreferred vs. nonpreferred to preferred) also impacts learning efficiency.