The left and right hemispheres are two cognitive processors that generate two distinct ways of thinking, knowing and relating to reality, each having relative autonomy, due to their different cognitive functions and specializations. Thus, if the left hemisphere is verbal, analytical and logical/rational-sequential, the right hemisphere is nonverbal, synthetic and intuitive-holistic. Despite these cognitive differences, the two cerebral hemispheres do not form a dual, dichotomous system, but, on the contrary, a complementary or interconnected one, accounting, according to the most current theories in neuroscience, for the structural model of the brain’s bihemisphericity. Starting from this model, I will show, bringing arguments from the fields of philosophy, psychoanalysis, literature, neuroscience and quantum physics, that in the Western tradition, this bihemisphericity, respectively complementarity, has been divided, split or fragmented. Thus, instead of complementarity, duality, opposition and competition were preferred. This led to the reductionism specific to the left hemisphere, that is to say to the asymmetry between the excess of the left hemisphere (excess of analysis, rationality, reductionism, fragmentation, exteriority and artificiality) and the deficit of the right hemisphere (deficit of intuition, feeling/sensitivity, significance, integrality, interiority and corporeality), the left hemisphere becoming in the Western tradition, through excessive and artificial valorization, the dominant hemisphere, and the right hemisphere the secondary one. My hypothesis lies in the fact that the left hemisphere has an eminently narcissistic (visual) pattern. I will show in this sense that the Western tradition has mainly favored the visual-analytical-fragmentary function of the left hemisphere (related to the image, mirror or mental screen) to the detriment of the intuitive-synthetic-integrating function of the right hemisphere (related to experience, motor skills or corporeality). This has led to the exacerbation of projective/visual narcissism, that is, to the expansion, "colonization" or artificial globalization of the fragmented vision of reality, specific to the left hemisphere, generating a series of negative consequences at all levels of life: psychological, socio-political, scientific-technological, cultural-spiritual and ecological. Given that the constitutive duality of the Western cultural-epistemological tradition consists of the excess of the left hemisphere and the deficit of the right hemisphere, I therefore propose to reevaluate the modes of functioning of the two cerebral hemispheres, not from the perspective of duality, but of their complementarity/interconnectivity, that is, from the perspective of the bihemisphericity model in neuroscience, as well as the corpuscle-wave model in quantum physics. This is the part-whole intercorrelation model, respectively the intercorrelation between the subject and the object/field of perception.

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