Question

synesthesia: mixed - up senses
we generally think of our senses as having completely separate functions. this is a logical assumption; after all, we can’t see with our ears or taste with our eyes. for people with a fact, the word synesthesia, however, senses can be conflated, or mixed together. in this combining of senses causes interesting sensory experiences. for example, some synesthetes (people who experience synesthesia) imagine tasting a particular flavor whenever they hear a certain sound. others “hear” a sound in their minds whenever they touch a certain object. the most common types of synesthesia involve colors. in one common subtype, for instance, synesthetes associate different colors with different letters of the alphabet. typically, synesthetes are not bothered by their synesthesia; in fact, many enjoy it.
what is the main, or central, idea of the passage?
people with synesthesia experience a fusing of different senses.
people with synesthesia may hear a sound when they touch an object.
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Explanation:

The passage introduces synesthesia, a condition where senses are merged, defines it, gives examples of sensory fusions, and notes most synesthetes enjoy it. The core idea is the fundamental experience of fused senses that defines synesthesia.

Answer:

People with synesthesia experience a fusing of different senses.