PHILOSOPHICAL REFLECTION ON CHRISTENSEN ET AL.'S PROPOSED EXPLANATION OF SCHIZOPHRENIA AND THE EMERGENCE OF PSYCHOTIC SYMPTOMS ...the strongest continues... In the explanation of this facts, Christensen et al. related many scientific findings and made some explanatory hypothesis about some possible causes (see Christensen et al., 2004). I will represent only the intelligible core of their explanatory proposal. The retroviral activation in the brain and cerebrospinal fluid of some patients wit...