Study of the neural mechanisms of Tourette syndrome is difficult because
A) it has not been linked to a particular gene..
B) there are no animal models.
C) the symptoms tend to subside as patients mature.
D) all of the above
E) none of the above
Question 2
Tourette syndrome occurs more frequently in
A) identical twins.
B) fraternal twins.
C) males.
D) females.
E) the elderly.
