Abstract
Lesions in the head of the caudate nucleus in 4 monkeys showed that this was''a crucial factor in determining augmented progres- sion. Stimulation of the caudate head in the unanesthetized state pro- duces rhythmic movements of a retrograde type. Comparison with ani- mals with lesions elsewhere showed that augmented progression was not a feature of brain damage. Grasping and biting reflexes were augmented in certain animals of the series.