Speed and accuracy of aimed hand movements in left-handed human subjects: sex-related differences in motor control

Area of Science:

• Neuroscience
• Motor Control
• Human Movement Science

Background:

• Sex-related differences in motor skills and brain lateralization are areas of ongoing research.
• Understanding handedness and its influence on motor learning and brain organization is crucial.

Purpose of the Study:

• To investigate sex-related differences in hand speed and motor learning in left-handed individuals.
• To explore the relationship between hand speed, accuracy, and brain organization for fine motor control.

Main Methods:

• Assessed hand skill using a peg moving task in left-handed subjects.
• Analyzed motor learning curves, hand speed, and accuracy.
• Examined sex differences in performance and learning capacity for dominant (right) and non-dominant (left) hands.

Main Results:

• Left-hand speed showed higher learning capacity than the right hand in left-handers.
• Females exhibited higher left-hand speed than males, with equivalent learning for both hands.
• Accuracy decreased with increased speed in females, but only for the right hand in males.

Conclusions:

• The right hemisphere (controlling the left hand) demonstrates superior motor learning capacity in left-handers.
• Left-hand-right-hand speed differences are primarily influenced by the left brain.
• Cerebral organization for fine motor control appears more bilateral in females than in males.