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The hopping response reappears in the hind limb of the cat after complete spinal cord transection at postoperative day means = 11.6. This response is hypermetric and slow compared with that in the normal cat and only forward, medial, and lateral hopping can be elicited. Anatomical and physiological changes in the spinal cord which may account for the reappearance of the hopping response are discussed.

Activation of the visual system with a moving black and white geometric pattern resulted in dense patches or columns of 2-deoxyglucose label in primate extrastriate visual cortex. The three-dimensional reconstruction of these metabolic columns showed that they were arranged in irregularly shaped slabs which extended in an essentially rostrocaudal plane. The slabs tended to merge with one another and to subdivide throughout their course in the extrastriate visual cortex.