Map of Chincoteague on retinex theory a theory suggesting that various wavelengths register on the color-sensitive components of the retina as a large number of color-separated photos. The visual mechanisms in the brain then average together and compare long-wave photos with the average of the shorter-wave photos, assigning different colors to them according to the ratios between them. retrieval n. the process of recovering or locating information stored in memory. Retrieval is the final stage of memory, after encoding and retention. retrieval cue a prompt or stimulus used to guide memory recall. retroactive interference see interference. Map of Chincoteague 2016.