objects which surround my body reflect its possible action upon them.
I will now, without touching the other images, modify slightly that image which I call my body.Perceptions point to these possible reactions. In this image I cut asunder, in thought, all the afferent nerves of the cerebrospinal system. What will happen? A few cuts with the scalpel have severed a few bundles of fibres: the rest of the universe, and even the rest of my body, remain what they were before. The change effected is therefore insignificant. As a matter of fact, my perception has entirely vanished. Let us consider more closely what has just occurred. Here are the images which compose the universe in general, then those which are near to my body, and finally my body itself. In this last image the habitual office of the centripetal nerves is to transmit movements to the brain and to the cord; the centrifugal nerves send back this movement to the periphery. Section of the centripetal nerves can therefore produce only one intelligible effect: that is, to interrupt the current which goes from the periphery to the periphery by way of the centre, and, consequently, to make it impossible for my body to extract, from among all the things which surround it, the quantity and quality of movement necessary in order to act upon them. Here is something which concerns action, and action alone.
