Experimental Brain Research

, Volume 2, Issue 2, pp 151–167

Brightness and pattern discrimination deficits in the pigeon after lesions of nucleus rotundus

  • William Hodos
  • Harvey J. Karten
Article

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

Ansa Lenticularis

Ant Comm

Anterior Commissure

D Th

Dorsal Thalamus

LFB

Lateral Forebrain Bundle

L Gd

Lateral Geniculate Nucleus, Pars Dorsalis

L Gv

Lateral Geniculate Nucleus, Pars Ventralis

OMT

Occipito-Mesencephalic Tract

Op Ch

Optic Chiasm

Op Tr

Optic Tract

Ov

Nucleus Ovoidalis

Pretec

Pretectal Nuclei

Rot

Nucleus Rotundus

Rot Ect Tr

Rotundo-Ectostriatal Tract

Sept

Septum

SMT

Septo-Mesencephalic Tract

Spir Lat

Nucleus Spiriformis Lateralis

Spir Med

Nucleus Spirformis Medialis

St M

Stria Medullaris

Sub-Pretect

Subpretectal Nucleus

Tect

Tectum

Tri

Nucleus Triangularis

TTT

Tecto-Thalamic Tract

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Copyright information

© Springer-Verlag 1966

Authors and Affiliations

  • William Hodos
    • 1
    • 2
    • 3
  • Harvey J. Karten
    • 1
    • 2
    • 4
  1. 1.University of MarylandCollege Park
  2. 2.the Walter Reed Army Institute of ResearchWashington. D.C.
  3. 3.Department of Experimental PsychologyWalter Reed Army Institute of ResearchWashington, D.C.
  4. 4.Department of PsychologyMassachusetts Institute of TechnologyCambridge

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