What effect did the ablation of the cerebellum have on a dog according to Pierre Flourens?

The ablation of the cerebellum, as studied by Pierre Flourens, resulted in a lack of coordinated movement in the dog. Flourens conducted experiments that involved removing parts of the brain in animals to study the effects of such surgeries. His research demonstrated that the cerebellum is crucial for motor control and coordination.

When the cerebellum was ablated in a dog, it exhibited significant difficulties in movement, which included uncoordinated and jerky motions, showing a clear link between the cerebellum's role in fine-tuning and regulating physical movements. This finding underscored the importance of the cerebellum not just in simple motor activities but also in the integration of sensory information to achieve smooth, coordinated actions.

In contrast, the other options would not be consistent with Flourens' observations regarding the cerebellum's specific function related to motor coordination. Emotional responses and cognitive functions are tied to different parts of the brain, while improved sensory perception did not align with the consequences of cerebellar ablation observed in his experiments. Thus, the impact on coordinated movement was the most direct and significant finding attributed to cerebellar removal in Flourens' research.