Note 24 — VISUAL IRRADIATION
Reading edition
The intensity of the objective stimulation may be represented by the line AB. If there were no reënforcement of stimulation the whole figure would be flat on top and of this height. The difference between AB and AC, or BC, represents the increase of intensity due to irradiation at the most favorably situated portion of the figure. The other portions receive increments proportional to their location, as indicated in the diagram.