A collection of fragments of understanding in the pursuit of deeper questions.
This is a computational model or neural circuit designed to identify motion or movement in a visual scene by computing the relative change in intensity across space and time. It compares the output of two spatially separated photoreceptor neurons, which are sensitive to light intensity changes. These neurons have their outputs delayed and multiplied, and the final output is a measure of correlation between the intensity changes at the two spatial locations. If the change an intensity at one location closely follows the change in intensity at the other location, with a small delay, the detector signals motion in a specific direction.