Short- and long-term memory of moving amoeboid cells
Fig 4
Kinetics of positional memory, defined by cos(ϕ1,3).
The angle between P1 and P3 was measured for different growing times of pseudopod P1 (learning time t1 in panels a, b) and for different intervals between stop of P1 and start of P3 (forgetting time t2 in panels d, e). A small angle between pseudopods P1 and P3 (i.e. cos(ϕ1,3) close to 1.0) implies that pseudopods P1 and P3 are extended in the same direction. Panels b and e are logarithmic transformation of the data in which α = cos(ϕ1,3)t-t0 / cos(ϕ1,3)max. The kinetic constants for learning and forgetting were obtained by linear regression analysis; the data points represented by the black bullets in panels d and e are incorporated in the linear regression. See S1 Fig for a similar analysis using L/R bias instead of cos(ϕ1,3).