Is there a "neural efficiency" in athletes? A high-resolution EEG study.
Level 4 - case-series / case-control
Cross-sectional comparative study of expert athletes and non-athlete controls
PubMed 18602484 · doi:10.1016/j.neuroimage.2008.05.061
What was done
High-resolution 56-channel EEG was recorded in 33 right-handed participants across three groups: 11 non-athletes, 11 elite fencing athletes, and 11 elite karate athletes. Participants observed images of fencing and karate attacks and rapidly clicked a right or left keyboard button corresponding to the monitor side of the attack. Movement-related cortical potentials—specifically the readiness potential (preparation) and motor potential (initiation)—were averaged relative to movement onset and spatially enhanced using surface Laplacian estimation.
What was found
For right-sided movements, potentials over the supplementary motor area and contralateral sensorimotor areas were higher in amplitude in non-athletes compared to both elite karate and fencing athletes. Over the ipsilateral sensorimotor area, motor potential amplitude was higher in elite karateka than in fencers, with a less asymmetrical distribution across bilateral sensorimotor areas in karateka compared to the other two groups. For left-sided movements, no group differences were observed. The abstract reported directional results without exact numerical values or effect sizes.
Why it matters
These findings suggest that neural efficiency in elite athletes is not a generalized phenomenon, but instead depends on the side of movement, cerebral hemisphere, and specific athletic discipline.
Limits
The sample size was small (n=11 per group) and restricted solely to right-handed participants performing an artificial laboratory task. The cross-sectional design prevents determining whether differences reflect training-induced neuroplasticity or self-selection bias, and no exact numerical metrics or confidence intervals were reported in the abstract.