Any note or phrase where the rhythmic emphasis (attack) or accent(s) fall on the downbeat(s) (beats 1,2,3 and 4 in * time) of a measure is considered non-syncopated.
Therefore a note or phrase is syncopated when the attack or accent(s) fall on the "offbeat" (anywhere other than the downbeat).
1 bar rhythmic variations featuring the rhythmic figures 6 and j 5.
This example features eighth notes on the hi-hat. This is one of the most common hi-hat rhythms in Rock music.
The previous pattern should have felt familiar because the combination of notes is exactly the same as example 23. The difference is, at a fixed tempo example 89 is played twice as fast as example 23.
The following four bar pattern illustrates the this point.