| The nervous system is a set of neurons, each having a soma and an axon. (EM 19) |
| A logical calculus of the ideas eminent in nervous activity. (EM 22) |
| All reflexes are dromes (propogate circularity entering the nervous system by dorsal and emerge by ventical roots), activities of feedback mechanisms, and consequently their functions include all purposeful activity. (EM 40) |
| Receptive field -- the region of the retina within which a local change of brightness would cause the ganglion cell to discharge. (EM 232) |
| Corruption is defined as the ratio of information in the input to that of the output. (EM 74) |
| What characterizes a digital or logical device is that its possible states are separated sharply. In the simplest case there are only two. . . Neurons are bivalent systems. (EM 74) |