86. The organization of brain is characterized by ____.

1. the interior of the skull
2. different regions responsible for different functions
3. the outer layer—the cerebral cortex
4. the nerve cells densely packed

87. According to the passage, a dog can still move in a coordinated manner, will eat and sleep, and even bark when ____ is (are) removed.

1. nerve cells
2. the skull
3. the hemispheres
4. the cerebral cortex

88. The word "seat" in the first paragraph means ____.

1. a chair
2. part of the body
3. place where something is or where something is carried on
4. cortex

89. The visual part of the cortex is especially interesting because ____.

1. specific layers of neurons are sensitive to particular orientations of input stimuli
2. much of the structure is genetically pre-determined
3. horizontal lines are stimulated
4. vertical lines are stimulated

90. Which of the following headings is the best title for this passage?

1. The Cerebral Cortex
2. The Specific Layers of Neurons
3. The Organization of the Brain
4. The Cerebral Hemispheres

(Reference keys.)