Mental practice can increase finger strength by what percentage, according to the material?

• A. 15%
• B. 22%
• C. 30%
• D. 40%

Answer: (B)

Mental practice works by imagining the movement and running through the sensory and motor components without actual finger movement. This mental rehearsal activates the same neural circuits involved in planning and executing the action, which can lead to more efficient neural recruitment and coordination when you do move. The material states an increase in finger strength of about 22% from mental practice, so that percentage is the best match for the effect described. The other figures are not supported by the source, since they imply larger or smaller gains than what the material reports.