Likewise , a person who had lost a leg would show degeneration in the leg part of motor cortex .
A person who had lost an arm would over time apparently lose some of the neuronal mass in the part of the motor cortex that normally controls the arm .
A person who had lost a leg would show degeneration in the leg part of motor cortex .
A person who had lost an arm would over time apparently lose some of the neuronal mass in the part of the motor cortex that normally controls the arm .