Higher nervous activity and motor disturbances were studied in three unconstrained dogs before and after in jury to the frontal or parietal lobes. There was no difference in the recovery time of conditioned reflex activity as between dogs with frontal or parietal lobe injury. However, damage to the frontal lobes led to motor disturbances and prolonged motor excitation, and the animals moved about aimlessly. These effects were observed both in the laboratory and in the animal house.