LOCAL NONUNIFORMITY OF THE VISUAL PERCEPTION IN THE PERIPHERAL VISION FIELD

Dmitry G. Shaposhnikov, Lubov N. Podladchikova

A.B.Kogan Research Institute for Neurocybernetics
Rostov State University, Rostov-on-Don, Russia
e-mail: nisms@krinc.ru


Abstract

Experimental data about local spatial nonuniformity in orientation selectivity and brightness sensitivity in the human peripheral vision field has been described. In addition to the known macrodynamics of sensory tuning sharpness in direction from the fovea to the periphery estimated in consequent 10ш areas of the vision field, local alteration of high- and low-selective microareas with period 2ш - 8ш has been shown. Subject reaction time in response to stimuli presented inside high-selective microareas is significantly less than in low-selective microareas (the mean time difference for light spot stimuli is 120 msec). Revealed local nonuniformity may reflect some basic mechanisms of context encoding foveal information and next fixation point choosing before estimation of object perceptual importance. Possible using the obtained results for development of advanced biologically-motivated artificial foveal system has been shortly considered.

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