How do video games affect fine motor skills?

Video game players: improve their visual attention & eye-hand coordination, but they use navigation strategies reliant on the brain's reward system (caudate nucleus), not its spatial memory system (hippocampus). Resultant decreases in hippocampal structure (grey matter) & function increase risk of neurological disorders like Alzheimer's. Long-term studies using functional MRI's are needed to define degree of risk.