(1) Shorten refresh by adding more frames (more interpolation, more Hz)
(2) Shorten refresh by adding black period between frames (black frame insertion, CRT flicker, plasma flicker, strobe backlight, scanning backlight)
(3) A combination of (1) or (2)
For example, a 60Hz display with 1/1000sec flashes once per refresh, has exactly the same amount of eye-tracking motion blur motion blur as a 1000fps@1000Hz sample-and-hold display (assuming complete refreshes during each of the visible 1/1000sec periods)
Some high end LCD/LED TV's interpolate to 240fps@240Hz, then flicker at 240Hz (scanning backlight) to a 1/960sec strobe, for "960Hz" simulation.