Increased cortical representation of the fingers of the left hand in string players.
Level 3 - non-randomized controlled study
Cross-sectional non-randomized comparative study with a concurrent control group
PubMed 7569982 · doi:10.1126/science.270.5234.305
What was done
Magnetic source imaging was used to compare the primary somatosensory cortical representations of the left and right hand digits between string instrument players and controls. The researchers also assessed whether the degree of cortical reorganization correlated with the age at which musical training began.
What was found
The cortical representation of the left-hand digits was larger in string players compared to controls, with the effect being smallest for the left thumb. No significant differences were observed for the digits of the right hand. Cortical reorganization of the fingering digits was correlated with the age at which the participant started playing. No numerical data or exact sample sizes were reported in the abstract.
Why it matters
This study provides foundational evidence that human primary somatosensory cortex organization is dynamic and use-dependent, adapting in response to sustained, specialized sensorimotor experience and early behavioral training.
Limits
The abstract provides no sample size, participant demographics, or numerical effect sizes with confidence intervals. Because the design is cross-sectional, it cannot fully distinguish between use-dependent plasticity and innate predisposition.