Fig. 3. Spontaneous transitions between different activity patterns in single units identified from multiunit recordings from CNSS. (A) SWA recording (i) in which two tonically active Dahlgren cells become silent (ii,iv) and a quiescent cell becomes tonically active (iii). (B) FWA recording (i) in which one cell switches spontaneously from phasic to tonic activity (ii), one from tonic to phasic activity (iii) and a third, quiescent, cell becomes bursting (iv).