Abstract
There was experimented on the conditioned response in groups of Carchesium polypinum EHRENBERG.
The vibration (unconditioned stimulus) and the light (conditioned stimulus) were given simultaneously to the animals in culture medium. They respond originally to the vibration by contracting their bodies, but not to the light.
In the present experiment an appropriate apparatus was devised. The animal behavior was projected on the screen set in it to make our observation easy.
Three kinds of control experiment were undertaken as follows : 1) the vibration only, 2) the light only and 3) none of stimuli was given.
After 50 times conditioning within about 30 minutes they were able to respond to the light stimulus with statistical significance.
