The present dissertation is an exploratory study of structural deficiency in schizophrenia, in which the usage of subject pronouns and type of sentence in narratives produced by native speakers of Colloquial Brazilian Portuguese diagnosed with schizophrenia is investigated. Couched within Generative Grammar Theory, in which human grammar is defined as a computational cognitive device, we explored the hypothesis that schizophrenia leads to structural impoverishment at the syntactic level. Two corpora of narratives of dream and waking reports were examined considering subject pronouns and type of sentences. Overall, our results showed significant higher proportion of matrix sentences and null pronouns, particularly of 3Person referential null pronouns in the schizophrenia group as compared to the control group. These findings are in line with the hypothesis of structural impoverishment in schizophrenia, especially if null pronouns are taken to be elements with reduced structure in comparison to full pronouns. Also, our results corroborate with the hypothesis that grammar in the face of schizophrenia might present a deficit in terms of functional categories, which leads to structural impoverishment and to anomalies in the referential use of pronouns (Tovar et al., 2019). Our findings are thus extra evidence that structural deficiency is a universal feature of schizophrenia, while suggesting manifestations of this deficiency is language dependent, being, thus, subject to parametric variation.