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Science 4 August 1972:
Vol. 177. no. 4047, pp. 444 - 447
DOI: 10.1126/science.177.4047.444
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Articles

Superior Colliculus of the Tree Shrew: A Structural and Functional Subdivision into Superficial and Deep Layers

V. A. Casagrande 1, J. K. Harting 1, W. C. Hall 1, I. T. Diamond 1, and G. F. Martin 2

1 Departments of Anatomy, Physiology, and Psychology, Duke University, Durham, North Carolina 27706
2 Department of Anatomy, Ohio State University, Columbus 43210

Superficial lesions of the superior colliculus produced deficits in form discrimination, while deeper lesions produced, in addition, an inability to track objects. These two syndromes were related to an anatomical subdivision: Superficial lesions resulted in anterograde degeneration in the visual thalamus, whereas lesions confined to the deeper layers produced degeneration in the nonvisual thalamus and in brainstem motor areas.


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