The Morris Water Maze Is Used to Examine Spatial Learning

question 47

Multiple Choice

The Morris water maze is used to examine spatial learning in animals. Mice, who are good swimmers, are placed in a large pool of water and must learn to find a clear platform located just under the water surface. The platform is their only escape from the pool. If they do not find the platform, they have to continue swimming until we take them out.
When mice perform in a Morris Water maze they sometimes become confused on a particular trial and take a long time to get to the platform. On other trials they are just lucky and go straight to it. How can we eliminate or reduce the influence of these unusual times?

• A) compare medians instead of means
• B) use trimmed means
• C) toss out scores that we don't like
• D) both a and b

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Definitions:

External Cause Code

A coding system used in healthcare to classify external causes of injuries, poisonings, and other adverse effects.

Poisoned

A condition produced by a substance that harms or causes death.

Sequela

An ailment resulting from a prior illness or injury.

Co-morbidity

The presence of one or more additional diseases or disorders co-occurring with a primary disease or disorder.