A frog’s eye tells the frog’s brain only four things about the world -- namely, where in its field of vision there are: (1) clear lines of contrast (which reveal the whereabouts of the horizon, for example); (2) sudden changes in illumination (which reveal that a stork is approaching, for example); (3)outlines in motion (which reveal the stork’s movement, for example); and most important of all, (4) the curves of the outlines of small, dark objects. The authors write that they are tempted to call the latter bug perceivers.

The frog’s brain does not get informed about the view -- or it does, but only about the part of the view that is of interest: friends, enemies, and the surface of the water. The foggy brain is also concerned with forming a “realistic” image of the surroundings. It is interested in getting something to eat without getting eaten. ~ Page 193

. . . . The activities of neurons, quite simply, are thought processes.” The frog’s unconscious resides in its eyes. ~ Page 193