Why Don't We Move Faster?

This peer-reviewed research article investigates the mechanisms underlying bradykinesia (generalized movement slowing) in Parkinson's disease patients.

The study compares reaching movements between PD patients and control subjects in speed-accuracy trade-off tasks, finding that while PD patients maintain accuracy comparable to controls, they require more trials to achieve target speeds.

The researchers conclude that bradykinesia represents an implicit decision not to move fast due to altered cost-benefit calculations regarding energy expenditure, suggesting a role for dopamine in motor motivation analogous to its role in reward-seeking behavior.