Brightness and pattern discrimination deficits in the pigeon after lesions of nucleus rotundus
Cite this article as: Hodos, W. & Karten, H.J. Exp Brain Res (1966) 2: 151. doi:10.1007/BF00240403 Summary
Pigeons were trained to peck one of two discs on which were projected visual stimuli. One brightness and three pattern discrimination problems were presented. Correct responses were rewarded with grain. After the discriminations were learned, bilateral electrolytic lesions were placed stereotaxically in 13 birds, and sham operations were performed in three birds. Those birds with lesions in nucleus rotundus demonstrated severe deficits in performance of the visual discriminations. Following prolonged post-operative retraining, a gradual return to pre-operative levels of performance was observed. The post-operative relearning proceeded at a much slower rate than the pre-operative learning. Control birds with lesions in dorsal thalamus, telencephalon and mesencephalon, or sham operations, all showed considerable post-operative savings. On the basis of the anatomical, electrophysiological and behavioral data available at present, nucleus rotundus appears to be a thalamic relay of visual information from optic tectum to telencephalon in the bird.
Key Words Nucleus Rotundus Visual Discrimination Pigeons Thalamic Lesions Abbreviations AnLen
Lateral Forebrain Bundle
Lateral Geniculate Nucleus, Pars Dorsalis
Lateral Geniculate Nucleus, Pars Ventralis
Rot Ect Tr
Nucleus Spiriformis Lateralis
Nucleus Spirformis Medialis
This research was supported in part by Grant NsG189-61 from the National Aeronautics and Space Administration and Contract DA49—193—MD—2397 from the Office of the Surgeon General, U.S. Army.
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