Figure 4. Correlation between motion and reaction.
(a) Time series of the moving average of the speed of center of mass, 
, taken along the trajectory of the amoeboid-like
motion of Figure 3 (black
line) and 
taken along the trajectory of the keratocyte-like
locomotion of Figure 4 (red
line). 
of the amoeboid-like type oscillates with a period of
about 200 s. but 
of the keratocyte-like type does not oscillate
significantly. (b) A scatter plot on the plane of 
, and 
of the amoeboid-like locomotion, where 
is the portion of area in which the concentration of
cortical factor is low in a cell. The plot shows the strong correlation
between and 
.