Compensation of Visual Background Motion in Salamanders

摘要: Self-motion produces a shift of the whole visual environment across retinae. Any object thus may fuse with background or at least be incorrectly locali7ed. Compensation shifts caused by self-motion can achieved different strategies: (i) Head and/or eyes are stabilized respect to during locomotion; (ii) proprioceptive, labyrinthine and motion signals computed together in localization systems CNS. Like other vertebrates, gaze stabilization is present salamanders mediated (visual) optokinetik reflex vestibulocolic reflex. These reflexes, however, relayed pretectum vestibular nuclei, able compensate only 50–80% velocity salamanders. As consequence, high retinal slip velocities persist locomotion. It assumed that this residual directly optic tectum. Pretectal nuclei were found project Whereas signal for from sent bilaterally tectum, nucleus projects contralateral dorsal tegmentum, cells area send head related both tecta. The hypothesis proposed these synergistic inputs establish directional selectivity tectal columns which suppresses responses would elicited objects moving same direction speed as background.