[The precision parameters of visual perception].
Here we demonstrate that retina resolution is a system parameter, depending not only on the size of receptive fields (RF) of the ganglion cells (GC), but as also on their number and the picture complexity. The curve of visual perception accuracy as a function of these three variables is nonmonotone with pronounced extremum corresponding to the RF size. The system approach allows us to reconsider the accuracy of picture approximation by various retina zones, while its application to the on- and off-subsystems of GC reveals a new function of the lateral geniculate bodies (LGB) which is to processes these afferents. We have deciphered "abnormal" alternation of ipsi- and contralateral projections in the six LGB layers. Neural network simulation demonstrated that LGBs improve the reception accuracy; being transparent for accurate reception they screen out indistinct reception and block its access to the visual cortex. Resumption and refinement of the screened information is related to eye movements and to superior colliculi (SC) assuming that SC inverses LGB function, allocating the map of indistinct pixels (image contours) by processing the on- and off-afferens.
Radchenko
A N
AN
St. Petersburg Institute for Informatics and Automation, Russian Academy of Sciences, Russia.
D000344:Afferent Pathways / Q000502:physiology; D005133:Eye Movements / Q000502:physiology; D005829:Geniculate Bodies / Q000502:physiology; D006801:Humans; D016571:Neural Networks, Computer; D012165:Retinal Ganglion Cells / Q000502:physiology; D013477:Superior Colliculi / Q000502:physiology; D013597:Systems Analysis; D013997:Time Factors; D014792:Visual Acuity / Q000502:physiology; D014794:Visual Fields / Q000502:physiology; D014796:Visual Perception / Q000502:physiology*