Further , this motor cortex was necessary for the arboreal lifestyles of our primate ancestors .
This suggests that the development of a discrete motor cortex was advantageous for placental mammals , and the motor skills that these organisms acquired were more complex than their early - mammalian ancestors .
This motor cortex was necessary for the arboreal lifestyles of our primate ancestors .
This suggests that the development of a discrete motor cortex was advantageous for placental mammals , and the motor skills that these organisms acquired were more complex than their early - mammalian ancestors .