Question

the brain is a remarkably adaptable organ with an impressive capacity to reorganize its functions and pathways in response to experience. for instance, if a person becomes blind, the brains visual cortex—which no longer receives any visual information—can be recruited to process other sensory input, like touch and hearing. this recruitment process explains why deprivation in one modality has actually been found to enhance the others. similarly, a person who has suffered a permanent brain injury can often recover the ability to function normally: the brain can reallocate the processing power of healthy brain structures to compensate for the lost functionality in the damaged part of the brain.
what is the meaning of modality as used in the passage?

• a source of visual information
• a brain structure that has been

ewired\ for a new function

• a main channel of sensation
• a brain structure that is dedicated to a specialized function

Explanation:

The passage discusses how when one sensory input (like vision for a blind person) is lost, other senses (touch, hearing) are enhanced. The term "modality" here refers to a sensory channel. Looking at the options, "a main channel of sensation" matches this context, as the example is about losing one sensory modality (vision) and others being strengthened.

Answer:

a main channel of sensation