The singular thing or event that catches one's attention is called stimulus.
The word singular, when used in grammar, means "that the word forms relate to or refer to members of a number of categories found in many languages, or persons, places, things, or It indicates that you are specifying an instance.” Singular nouns are nouns that refer to a unique thing or person.
Singular nouns refer to a single object. This is the type of noun you almost always find when you search for nouns on Dictionary.com. Like most nouns, singular nouns can be used to refer to people, places, things, or ideas. A singular noun always refers to a person or thing.
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