To remember the right hand rule, write the xyz order twice: xyzxyz. 1  Next, find the pattern youâre looking for: 2  xy => z (x cross y is z) 3  yz => x (y cross z is x; we looped around: y to z to x) 4  zx => y.
Huntington disease is a progressive brain disorder that causes uncontrolled movements, emotional problems, and loss of thinking ability (cognition).Adult-onset Huntington disease, the most common form of this disorder, usually appears in a person's thirties or forties.untington disease is a progressive brain disorder that causes uncontrolled movements, emotional problems, and loss of thinking ability (cognition).
Huntington's disease is caused by an altered gene. This gene is passed on from parent to child, but the condition isnât obvious at birth. The symptoms usually, but not always, first appear when the person is approaching middle age. Huntington's disease is a slow, progressive condition that affects people differently.