Bräucker R, Köhler R, Machemer H (1996) Time-dependence of gravitaxis and gravikinesis in Paramecium caudatum.

Abstract 

Graviorientation and gravikinesis of Paramecium caudatum were analyzed before and after a reorientation of the experimental chamber. Both responses showed a time dependent change: The precision of graviorientation rapidly decreases within 60 s after the chamber reorientation then remaining virtually constant for at least 10 minutes. In contrast, the value of gravikinesis increases within 100 s after chamber reorientation. We suppose an interaction between gravistimulation and a mechanical stimulation for explanation.