I'IG. 3. Graphical summary of reactions to balanced illumination in animals which had been subjected to asymmetrical mterfer- 

 fiirc with their photoreceptive mechanism. The circle represents the observation circle of the apparatus; the groups of arrows, the 

 ilirection of the light beams; the silhouette of the scorpion, the animal's position when subjected to bilateral illumination; the shaded 

 segment, the average reaction range of normal animals; the curved radial arrows, the average paths of experimental animals (based 

 nn ten trials), a. One median eye capped, b. One median eye and both lateral eye groups capped, f. One median eye, both 

 lateral eyes, and both cutaneous sensitive areas blackened, d. One lateral eye group capped, e. Cutaneous sensitive area of one 

 side blackened. /. Cutaneous sensitive area of one side blackened and median and lateral eyes on both sides capped, g. One median 

 ml one lateral eye on the same side capped. /;. One median eye capped and the cutaneous sensitive area of the same side black- 

 ■iKd- i. One lateral eye group capped and the cutaneous sensitive area of the same side blackened j All photoreceptors on one 

 side of the body blackened. 



