The radial contraction‐relaxation activity was recorded in Physarum by the infrared technique either at distant sites or along a linear array of 5 or 10 sites, each 2.5 mm distant from each other. There is a tendency in the plasmodium to maintain the same period throughout the whole plasmodium, although the period may change with time. The recording at a single site represents aggregated rhythms, the mode of which is either synchronous, or twinned or of the shoulder type. The last two modes refer to a split rhythm. There is also a tendency toward synchrony at neighbouring sites. However, there is often a gradient of phase along the array of recorded sites. The gradient is pot stable and often shows a reversion. This reversion displays the type 0 resetting; the resetting occurs spontaneously. Usually the resetting takes place only in a part of the oscillating system at a certain site. The local synchronous mode may thus be changed into the twinned or the shoulder mode.