Apparent Motion Can Be Influenced by an Observer's Point of Fixation

question 692

Multiple Choice

Apparent motion can be influenced by an observer's point of fixation so that objects beyond the point of fixation appear to

• A)move backward.
• B)move forward.
• C)remain stationary.
• D)disappear.

---

Definitions:

Medusa

A jellyfish-like animal; a free-swimming, umbrella-shaped stage in the life cycle of certain cnidarians. Compare with polyp.

Planula

The free-swimming, ciliated larva form of certain cnidarians, such as jellyfish, before it settles on a surface and develops into a polyp.

Miracidium

A free-swimming larval stage in the life cycle of certain parasitic flukes, hatching from eggs and infecting the first intermediate host, typically a snail.

Polyp Colony

An aggregation of many individual, yet genetically identical, polyps that are connected, forming organisms such as corals.