Fig. 5. Mean phase angles of DON (A) and tectal units (B) following 5 Hz
stimulation at different amplitudes. Phase angles of individual DON units vary
little with amplitude and have mean phase angles of either 310 or 130 degrees.
Tectal unit phase angles are mainly between 0 and 180 degrees, but vary
considerably. However, phase angles do not depend much on amplitude in most
units.