In rats, the slowest movements give rise to frequencies around 6.5 Hz, the fastest to frequencies around 9 Hz, although faster oscillations can be observed briefly during very
vigorous movements such as large jumps.
Postwar Modern Art and the Rejection of Modernism The development of a new American art
movement was held in abeyance until after World War II, when the United States took the lead in the formation of a
vigorous new art known as abstract expressionism with the impetus of
such artists as Arshile Gorky, Jackson Pollock, and Willem de Kooning.