The drinking sprees of Ben greatly changed the attitude he showed toward his family, particularly to his wife. The Report continued: "At first, it was verbal and emotional abuses but as time passed, he became physically abusive. Marivic claimed that the viciousness of her husband was progressive every time he got drunk. It was a painful ordeal Marivic had to anticipate whenever she suspected that her husband went for a drinking [spree]. They had been married for twelve years[;] and practically more than eight years, she was battered and maltreated relentlessly and mercilessly by her husband whenever he was drunk." Marivic sought the help of her mother-in-law, but her efforts were in vain. Further quoting from the Report, "[s]he also sought the advice and help of close relatives and well-meaning friends in spite of her feeling ashamed of what was happening to her. But incessant battering became more and more frequent and more severe. x x x."43 From the totality of evidence presented, there is indeed no doubt in the Court's mind that Appellant Marivic Genosa was a severely abused person. Effect of Battery on Appellant Because of the recurring cycles of violence experienced by the abused woman, her state of mind metamorphoses. In determining her state of mind, we cannot rely merely on the judgment of an ordinary, reasonable person who is evaluating the events immediately surrounding the incident. A Canadian court has aptly pointed out that expert evidence on the psychological effect of battering on wives and common law partners are both relevant and necessary. "How can the mental state of the appellant be appreciated without it? The average member of the public may ask: Why would a woman put up with this kind of treatment? Why should she continue to live with such a man? How could she love a partner who beat her to the point of requiring hospitalization? We would expect the woman to pack her bags and go. Where is her self-respect? Why does she not cut loose and make a new life for herself? Such is the reaction of the average person confronted with the so-called 'battered wife syndrome.'"44 To understand the syndrome properly, however, one's viewpoint should not be drawn from that of an ordinary, reasonable person. What goes on in the mind of a person who has been subjected to repeated, severe beatings may not be consistent with -- nay, comprehensible to -- those who have not been through a similar experience. Expert opinion is essential to clarify and refute common myths and misconceptions about battered women.45 The theory of BWS formulated by Lenore Walker, as well as her research on domestic violence, has had a significant impact in the United States and the United Kingdom on the treatment and prosecution of cases, in which a battered woman is charged with the killing of her violent partner. The psychologist explains that the cyclical nature of the violence inflicted upon the battered woman immobilizes the latter's "ability to act decisively in her own interests, making her feel trapped in the relationship with no means of escape."46 In her years of research, Dr. Walker found that "the abuse often escalates at the point of separation and battered women are in greater danger of dying then."47 Corroborating these research findings, Dra. Dayan said that "the battered woman usually has a very low opinion of herself. She has x x x self-defeating and self-sacrificing characteristics. x x x [W]hen the violence would happen, they usually think that they provoke[d] it, that they were the one[s] who precipitated the violence[; that] they provoke[d] their spouse to be physically, verbally and even sexually abusive to them."48 According to Dra. Dayan, there are a lot of reasons why a battered woman does not readily leave an abusive partner -- poverty, self-blame and guilt arising from the latter's belief that she provoked the