Is it possible for absolutely everyone to attain enlightenment?

As seen in the title of this question, I'm not sure whether everyone is able to attain enlightenment. As far as my study and introspective analysis have shown to me, it seems that in order to uproot ignorance permanently, one has to be able to correct the distortions of the mind (perceptions, thoughts and views). And the only way to do that effectively is through right understanding about reality (dukkha, the illusion of the self, impermanence, and the Dhamma in general). But what happens when one is factually limited to exert that right understanding? What happens when one cannot exert self-control, or when one is handicapped to use logic, language, cognition or the capacity for thinking abstract thoughts properly? (I'm really sorry if I'm using some words in a rude fashion; english is not my first language) I'm talking about biological or physical limitations that may impede a normal use of mental abilities (lack of cerebral structures, disease or anatomical abnormalities, lack of development of faculties, etc.). What do the suttas tell us about this? What is your personal experience in with this topic? What does scientific research tell us about this? I'd appreciate any kind of answer. Thanks in advance for your time and patience.