Final answer:
Spasms nutans is characterized by rapid pendular nystagmus, not torticollis or slow head-turning.
Step-by-step explanation:
Spasms nutans is not characterized by torticollis or slow head-turning. It is a condition characterized by rapid pendular nystagmus, which is an involuntary back-and-forth movement of the eyes. The condition usually affects young children and may be associated with underlying neurological conditions.