"Extra" optic fibers exclude normal fibers from tectal regions in goldfish.

摘要: A small group of selected optic fibers were surgically deflected from one tectum into the other, thus creating a novel additional projection originating area ipsilateral retina. The normal to this "recipient" also severed so that both and regrew at about same time. reinnervation pattern was analyzed by autoradiography electrophysiologic mapping. Both techniques showed "normal" failed intermix. typically formed several well-defined patches innervation in roughly appropriate region denervated recipient tectum. filled remaining uninnervated tectal areas completely or nearly exculded occupied fibers. This segregation often quite sharp having an apparent average overlap less than 25-50 micron. electrophysiology indicated projections retinotopically organized but mapping compressed. compression, consequence being squeezed onto smaller tectum, similar previously observed following ablations part negligible surgical damage present experiment, however, excludes kind cytochemical reorganization suggested produce compression. findings provide evidence for competitive type interaction between